Applied Clay Science最新文献_第7页

Kinetics and mechanism of anion exchange in layered double hydroxide nanoparticle

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-01-01 DOI: 10.1016/j.clay.2024.107694

Haoran Guo , Qingyin Tang , Dongshuai Hou , Muhan Wang , Zhenxing Du , Sihao Ren , Xiujun Wang , Feixiang Chen , Pan Wang

Understanding the anion exchange behavior of Layered Double Hydroxide (LDH) was crucial for comprehending the corrosion inhibitor process and mechanism of LDH nanoparticles, which was pivotal for the synthesis and practical application of anion intercalated LDH protective materials. In this study, the anion exchange behavior of LDH-eugenol (EG), LDH-lactate (Lc), LDH-2-mercaptoethanesulfonate (MS), and LDH-nitrate was simulated in a 3.5 wt% NaCl solution. The anion exchange order of LDH was investigated by quantifying the changes in the amounts of anions released from the LDH interlayers and evaluating the dispersion degree of the original interlayer anion in the NaCl solution. The results showed that the anion exchange capacity of LDH nanoparticles followed the order of LDH-EG > LDH-Lc > LDH-MS > LDH-nitrate. Furthermore, the study elucidated the exchange process of LDH nanoparticles, which involved the swelling of LDH nanoparticles, the adsorption and permeation of chloride ions, and the release of interlayer anions, ultimately reaching a state of dynamic equilibrium. The efficiency of anion exchange was critically influenced by hydrogen bonds between the polar oxygen atoms on the interlayer anions and the hydrogen atoms on the hydroxyl groups on the LDH lamellae. The weaker the hydrogen bonds between the anions and the lamellae, the easier it was for the anions to detach from the interlayer when chloride ions occupied the coordination sites, and vice versa.

{"title":"Kinetics and mechanism of anion exchange in layered double hydroxide nanoparticle","authors":"Haoran Guo , Qingyin Tang , Dongshuai Hou , Muhan Wang , Zhenxing Du , Sihao Ren , Xiujun Wang , Feixiang Chen , Pan Wang","doi":"10.1016/j.clay.2024.107694","DOIUrl":"10.1016/j.clay.2024.107694","url":null,"abstract":"<div><div>Understanding the anion exchange behavior of Layered Double Hydroxide (LDH) was crucial for comprehending the corrosion inhibitor process and mechanism of LDH nanoparticles, which was pivotal for the synthesis and practical application of anion intercalated LDH protective materials. In this study, the anion exchange behavior of LDH-eugenol (EG), LDH-lactate (Lc), LDH-2-mercaptoethanesulfonate (MS), and LDH-nitrate was simulated in a 3.5 wt% NaCl solution. The anion exchange order of LDH was investigated by quantifying the changes in the amounts of anions released from the LDH interlayers and evaluating the dispersion degree of the original interlayer anion in the NaCl solution. The results showed that the anion exchange capacity of LDH nanoparticles followed the order of LDH-EG > LDH-Lc > LDH-MS > LDH-nitrate. Furthermore, the study elucidated the exchange process of LDH nanoparticles, which involved the swelling of LDH nanoparticles, the adsorption and permeation of chloride ions, and the release of interlayer anions, ultimately reaching a state of dynamic equilibrium. The efficiency of anion exchange was critically influenced by hydrogen bonds between the polar oxygen atoms on the interlayer anions and the hydrogen atoms on the hydroxyl groups on the LDH lamellae. The weaker the hydrogen bonds between the anions and the lamellae, the easier it was for the anions to detach from the interlayer when chloride ions occupied the coordination sites, and vice versa.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"266 ","pages":"Article 107694"},"PeriodicalIF":5.3,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-performance dickite strengthened double-crosslinked hydrogel electrolytes for aqueous zinc-ion batteries

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-31 DOI: 10.1016/j.clay.2024.107691

Ziwen Ma , Ye Li , Zhi Qu , Zhonghua Ma , Kuo Yang , Fangfei Li , Bing Xue

The development of flexible devices has imposed higher demands on the mechanical and electrochemical properties of hydrogel electrolytes. To enhance the mechanical properties of hydrogels, this study prepared a composite hydrogel (P-D₃₀-DIOH₁) composed of covalently crosslinked polyacrylamide (PAM), diacetone acrylamide (DAAM), and expanded dickite (DIOH). The results indicated that PAM and DAAM could form a dual crosslinked network structure through hydrogen bonding and molecular chain entanglement, thereby improving the mechanical properties of the hydrogel. Furthermore, the surface of dickite, which is rich in -OH and SiO groups, could simultaneously form hydrogen bonds with PAM and DAAM, thus acting as an inorganic crosslinking agent. After expansion treatment, the dickite layers were fully exposed, increasing the specific surface area and further enhancing the physical crosslinking effect of dickite. Mechanical testing revealed that the tensile strength of the DAAM and DIOH reinforced P-D₃₀-DIOH₁ hydrogel reached 0.374 MPa, with a tensile elongation of 2100 % and a compressive strength of 0.308 MPa at 75 % deformation. P-D₃₀-DIOH₁ hydrogel electrolyte exhibited a high ionic conductivity (20.7 mS cm⁻¹), attributed to the negatively charged expanded dickite, which enriched Zn²⁺ and formed rapid Zn²⁺ transport channels under the electric field. The P-D₃₀-DIOH₁ hydrogel effectively stabilized the surface of the Zn anode, inhibited the growth of Zn dendrites, and reduced the formation of by-products. When the P-D₃₀-DIOH₁ hydrogel electrolyte was assembled into the MnO₂//Zn battery, it operated stably for 700 cycles, maintaining a specific discharge capacity of 118 mAh g⁻¹ at a current density of 150 mA g⁻¹. Moreover, the battery delivered a specific discharge capacity of 270 mA h g⁻¹ at 60 mA g⁻¹, and even at 600 mA g⁻¹, it retained a high reversible capacity of 115 mAh g⁻¹, demonstrating excellent electrochemical performance. Furthermore, the assembled flexible battery continued to function effectively under physical deformations such as bending, impact, and puncture.

{"title":"High-performance dickite strengthened double-crosslinked hydrogel electrolytes for aqueous zinc-ion batteries","authors":"Ziwen Ma , Ye Li , Zhi Qu , Zhonghua Ma , Kuo Yang , Fangfei Li , Bing Xue","doi":"10.1016/j.clay.2024.107691","DOIUrl":"10.1016/j.clay.2024.107691","url":null,"abstract":"<div><div>The development of flexible devices has imposed higher demands on the mechanical and electrochemical properties of hydrogel electrolytes. To enhance the mechanical properties of hydrogels, this study prepared a composite hydrogel (P-D<sub>30</sub>-DIOH<sub>1</sub>) composed of covalently crosslinked polyacrylamide (PAM), diacetone acrylamide (DAAM), and expanded dickite (DIOH). The results indicated that PAM and DAAM could form a dual crosslinked network structure through hydrogen bonding and molecular chain entanglement, thereby improving the mechanical properties of the hydrogel. Furthermore, the surface of dickite, which is rich in -OH and Si<img>O groups, could simultaneously form hydrogen bonds with PAM and DAAM, thus acting as an inorganic crosslinking agent. After expansion treatment, the dickite layers were fully exposed, increasing the specific surface area and further enhancing the physical crosslinking effect of dickite. Mechanical testing revealed that the tensile strength of the DAAM and DIOH reinforced P-D<sub>30</sub>-DIOH<sub>1</sub> hydrogel reached 0.374 MPa, with a tensile elongation of 2100 % and a compressive strength of 0.308 MPa at 75 % deformation. P-D<sub>30</sub>-DIOH<sub>1</sub> hydrogel electrolyte exhibited a high ionic conductivity (20.7 mS cm<sup>−1</sup>), attributed to the negatively charged expanded dickite, which enriched Zn<sup>2+</sup> and formed rapid Zn<sup>2+</sup> transport channels under the electric field. The P-D<sub>30</sub>-DIOH<sub>1</sub> hydrogel effectively stabilized the surface of the Zn anode, inhibited the growth of Zn dendrites, and reduced the formation of by-products. When the P-D<sub>30</sub>-DIOH<sub>1</sub> hydrogel electrolyte was assembled into the MnO<sub>2</sub>//Zn battery, it operated stably for 700 cycles, maintaining a specific discharge capacity of 118 mAh g<sup>−1</sup> at a current density of 150 mA g<sup>−1</sup>. Moreover, the battery delivered a specific discharge capacity of 270 mA h g<sup>−1</sup> at 60 mA g<sup>−1</sup>, and even at 600 mA g<sup>−1</sup>, it retained a high reversible capacity of 115 mAh g<sup>−1</sup>, demonstrating excellent electrochemical performance. Furthermore, the assembled flexible battery continued to function effectively under physical deformations such as bending, impact, and puncture.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"266 ","pages":"Article 107691"},"PeriodicalIF":5.3,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of the mineralogical and textural properties of bricks with volcanic ash temper

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-31 DOI: 10.1016/j.clay.2024.107690

María López Gómez, Giuseppe Cultrone

During the eruption of the Tajogaite volcano in La Palma (Canary Islands, Spain) in 2021, large amounts of pyroclastic material were emitted, which had severe environmental, health and economic impacts on nearby localities. One solution for the disposal of the volcanic ash that settled on the streets, roads, and roofs of La Palma is to use it as temper in brick production, which would also reduce the amount of clay required to make the bricks. Two different sizes (fine and coarse) and three percentages (10, 20, and 30 % by weight) of volcanic ash were added to a clayey sediment from Viznar (Granada, Spain) to produce bricks that were fired at 800, 950, and 1100 °C in an electric oven with an oxidising atmosphere. The chemistry, mineralogy and texture of the samples with volcanic ash were compared to control samples made without it and fired at the same temperature. In the bricks with ash there was a reduction in the phases detected in the control samples (quartz, phyllosilicates, and newly formed gehlenite, and diopside) and augite, a phase present in the volcanic ash, appeared. The volcanic ash fragments in the samples fired at over 950 °C turned red in color, owing to the formation of iron oxides. The increase in the concentration of volcanic ash caused a progressive increase in the vitreous phase and in clinopyroxene. Conversely, there were no significant differences in terms of their mineralogical composition between the fired bricks made with fine or coarse ash, although the samples with coarse volcanic ash apparently showed higher porosity.

{"title":"Study of the mineralogical and textural properties of bricks with volcanic ash temper","authors":"María López Gómez, Giuseppe Cultrone","doi":"10.1016/j.clay.2024.107690","DOIUrl":"10.1016/j.clay.2024.107690","url":null,"abstract":"<div><div>During the eruption of the Tajogaite volcano in La Palma (Canary Islands, Spain) in 2021, large amounts of pyroclastic material were emitted, which had severe environmental, health and economic impacts on nearby localities. One solution for the disposal of the volcanic ash that settled on the streets, roads, and roofs of La Palma is to use it as temper in brick production, which would also reduce the amount of clay required to make the bricks. Two different sizes (fine and coarse) and three percentages (10, 20, and 30 % by weight) of volcanic ash were added to a clayey sediment from Viznar (Granada, Spain) to produce bricks that were fired at 800, 950, and 1100 °C in an electric oven with an oxidising atmosphere. The chemistry, mineralogy and texture of the samples with volcanic ash were compared to control samples made without it and fired at the same temperature. In the bricks with ash there was a reduction in the phases detected in the control samples (quartz, phyllosilicates, and newly formed gehlenite, and diopside) and augite, a phase present in the volcanic ash, appeared. The volcanic ash fragments in the samples fired at over 950 °C turned red in color, owing to the formation of iron oxides. The increase in the concentration of volcanic ash caused a progressive increase in the vitreous phase and in clinopyroxene. Conversely, there were no significant differences in terms of their mineralogical composition between the fired bricks made with fine or coarse ash, although the samples with coarse volcanic ash apparently showed higher porosity.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"266 ","pages":"Article 107690"},"PeriodicalIF":5.3,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Channel confinement effects in palygorskite and sepiolite: Mechanisms behind color and stability variations in Maya Blue pigments

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-30 DOI: 10.1016/j.clay.2024.107689

Jixing Fan , Qian Liu , Li, Li, Guanzheng Zhuang, Peng Yuan

Maya Blue, a hybrid pigment that can be synthesized by heating a mixture of palygorskite (or sepiolite) and indigo, has unclear relationships between the structural features of clay substrates, heating atmosphere, colors, and stability. This study investigates the color properties, stability, and clay-dye interactions of Maya Blue pigments based on palygorskite and sepiolite, heated under air and vacuum conditions (180 °C for 8 h). Reflectance spectra, CIE color parameters, surface properties, and Fourier-transform infrared spectroscopy were employed to evaluate these pigments. Results indicate that indigo monomers can penetrate the channels of both palygorskite and sepiolite, conferring a greenish-blue hue and high stability. However, the diffusion of indigo is determined by the size match between the channel and indigo monomers. In palygorskite, indigo monomers can diffuse only upon heating because the channel size is only a little bit larger than the indigo molecule, while in sepiolite, lager channels allow easy diffusion, even without heating. However, sepiolite's larger channels make indigo molecules more prone to chemical degradation or migration. Under vacuum conditions, indigo molecules more easily diffuse into the channels of both clay minerals, yielding pigments with higher saturation and enhanced stability. These findings highlight the size-matching between clay minerals' micropores and organic molecules and offer valuable guidance for optimizing the preparation process of clay-dye hybrid pigments.

{"title":"Channel confinement effects in palygorskite and sepiolite: Mechanisms behind color and stability variations in Maya Blue pigments","authors":"Jixing Fan , Qian Liu , Li, Li, Guanzheng Zhuang, Peng Yuan","doi":"10.1016/j.clay.2024.107689","DOIUrl":"10.1016/j.clay.2024.107689","url":null,"abstract":"<div><div>Maya Blue, a hybrid pigment that can be synthesized by heating a mixture of palygorskite (or sepiolite) and indigo, has unclear relationships between the structural features of clay substrates, heating atmosphere, colors, and stability. This study investigates the color properties, stability, and clay-dye interactions of Maya Blue pigments based on palygorskite and sepiolite, heated under air and vacuum conditions (180 °C for 8 h). Reflectance spectra, CIE color parameters, surface properties, and Fourier-transform infrared spectroscopy were employed to evaluate these pigments. Results indicate that indigo monomers can penetrate the channels of both palygorskite and sepiolite, conferring a greenish-blue hue and high stability. However, the diffusion of indigo is determined by the size match between the channel and indigo monomers. In palygorskite, indigo monomers can diffuse only upon heating because the channel size is only a little bit larger than the indigo molecule, while in sepiolite, lager channels allow easy diffusion, even without heating. However, sepiolite's larger channels make indigo molecules more prone to chemical degradation or migration. Under vacuum conditions, indigo molecules more easily diffuse into the channels of both clay minerals, yielding pigments with higher saturation and enhanced stability. These findings highlight the size-matching between clay minerals' micropores and organic molecules and offer valuable guidance for optimizing the preparation process of clay-dye hybrid pigments.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107689"},"PeriodicalIF":5.3,"publicationDate":"2024-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Palygorskite/iron nanoparticles composite for the removal of in(III) from aqueous solutions: Characterization, performance, and mechanism

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-27 DOI: 10.1016/j.clay.2024.107678

Pan Zhang, Lu Tang, ChunYan Lang

Although indium and related derivatives are essential to the semiconductor communication sector, they are rather hazardous to the environment. A thermal-acid modified palygorskite supported nano-zero-valent iron composite (HA-PAL/nZVI) suitable for In(III) adsorption was prepared by a simple and rapid liquid-phase reduction method, and HA-PAL/nZVI was characterized by XRD, FT-IR, BET and SEM-EDS. The experimental results show that the saturated adsorption capacity of HA-PAL/nZVI for In(III) can reach 301.76 mg·g⁻¹ within 360 min under pH 3 and K 298.15. The adsorption process of In(III) conforms to the Langmuir isotherm model and the pseudo-second-order kinetic model, and ΔH = 10.04 kJ·mol⁻¹, ΔS = 90.80 J·mol⁻¹·K⁻¹, ΔG < 0, which belongs to the rate-controlling step, spontaneous and endothermic chemical adsorption; In addition to Cu²⁺ and PO₄³⁻, cations (Na⁺, K⁺, Ca²⁺, Mg²⁺, Sn⁴⁺, Pb²⁺, Zn²⁺, Cd²⁺), anions (Cl⁻, SO₄²⁻, NO₃⁻, CO₃⁻), organic molecules (H₂C₂O₄) and ionic strength showed significant tolerance to the adsorption of In(III) by HA-PAL/nZVI. Combined with XPS analysis results, it was determined that the HA-PAL/nZVI adsorption mechanism of In(III) was mainly based on redox, co-precipitation and physical adsorption.

{"title":"Palygorskite/iron nanoparticles composite for the removal of in(III) from aqueous solutions: Characterization, performance, and mechanism","authors":"Pan Zhang, Lu Tang, ChunYan Lang","doi":"10.1016/j.clay.2024.107678","DOIUrl":"10.1016/j.clay.2024.107678","url":null,"abstract":"<div><div>Although indium and related derivatives are essential to the semiconductor communication sector, they are rather hazardous to the environment. A thermal-acid modified palygorskite supported nano-zero-valent iron composite (HA-PAL/nZVI) suitable for In(III) adsorption was prepared by a simple and rapid liquid-phase reduction method, and HA-PAL/nZVI was characterized by XRD, FT-IR, BET and SEM-EDS. The experimental results show that the saturated adsorption capacity of HA-PAL/nZVI for In(III) can reach 301.76 mg·g<sup>−1</sup> within 360 min under pH 3 and K 298.15. The adsorption process of In(III) conforms to the Langmuir isotherm model and the pseudo-second-order kinetic model, and ΔH = 10.04 kJ·mol<sup>−1</sup>, ΔS = 90.80 J·mol<sup>−1</sup>·K<sup>−1</sup>, ΔG < 0, which belongs to the rate-controlling step, spontaneous and endothermic chemical adsorption; In addition to Cu<sup>2+</sup> and PO<sub>4</sub><sup>3−</sup>, cations (Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup>, Sn<sup>4+</sup>, Pb<sup>2+</sup>, Zn<sup>2+</sup>, Cd<sup>2+</sup>), anions (Cl<sup>−</sup>, SO<sub>4</sub><sup>2−</sup>, NO<sub>3</sub><sup>−</sup>, CO<sub>3</sub><sup>−</sup>), organic molecules (H<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) and ionic strength showed significant tolerance to the adsorption of In(III) by HA-PAL/nZVI. Combined with XPS analysis results, it was determined that the HA-PAL/nZVI adsorption mechanism of In(III) was mainly based on redox, co-precipitation and physical adsorption.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107678"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The beneficial effect of halloysite nanotubes as a matrix preventing the break of ordered mesoporous silica structure under microwave-assisted metal deposition

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-27 DOI: 10.1016/j.clay.2024.107686

Gleb Zasypalov , Anna Vutolkina , Aleksey Pimerzin , Vladimir Klimovsky , Egor Abramov , Aleksandr Glotov

The influence of microwave treatment on the structural characteristics of MCM-41 silica-based supports and properties of Ru-containing catalysts prepared thereon was investigated. The 800 W and 20 min mode of microwave treatment inevitably destroyed MCM-41 silica structure during the deposition of ruthenium particles. When moderate irradiation power to 400 W and duration time to 10 min, the destruction of the support was partially prevented, but the ruthenium loading reduces, simultaneously. To reinforce MCM-41 silica halloysite nanotubes (Hal) were introduced as a matrix for templated self-assembly of mesoporous silica, thereby forming ordered hierarchical MCM-41/Hal composite. The beneficial effect of Hal on the structural properties and stability of MCM-41 support under microwave-assisted Ru impregnation was demonstrated. MCM-41/Hal-supported catalysts revealed enhanced textural properties and characteristics of active component (high metal loading, narrow particle size distribution, high dispersion) compared to the analogous based on pure MCM-41. The catalytic properties were estimated in hydrogenation of multi-component aromatics-containing model feed, and Ru/MCM-41/Hal catalyst reveals 100 % benzene and ca. 89–90 % ethylbenzene and toluene conversion at the temperature range of 100–150°С for 3 h.

{"title":"The beneficial effect of halloysite nanotubes as a matrix preventing the break of ordered mesoporous silica structure under microwave-assisted metal deposition","authors":"Gleb Zasypalov , Anna Vutolkina , Aleksey Pimerzin , Vladimir Klimovsky , Egor Abramov , Aleksandr Glotov","doi":"10.1016/j.clay.2024.107686","DOIUrl":"10.1016/j.clay.2024.107686","url":null,"abstract":"<div><div>The influence of microwave treatment on the structural characteristics of MCM-41 silica-based supports and properties of Ru-containing catalysts prepared thereon was investigated. The 800 W and 20 min mode of microwave treatment inevitably destroyed MCM-41 silica structure during the deposition of ruthenium particles. When moderate irradiation power to 400 W and duration time to 10 min, the destruction of the support was partially prevented, but the ruthenium loading reduces, simultaneously. To reinforce MCM-41 silica halloysite nanotubes (Hal) were introduced as a matrix for templated self-assembly of mesoporous silica, thereby forming ordered hierarchical MCM-41/Hal composite. The beneficial effect of Hal on the structural properties and stability of MCM-41 support under microwave-assisted Ru impregnation was demonstrated. MCM-41/Hal-supported catalysts revealed enhanced textural properties and characteristics of active component (high metal loading, narrow particle size distribution, high dispersion) compared to the analogous based on pure MCM-41. The catalytic properties were estimated in hydrogenation of multi-component aromatics-containing model feed, and Ru/MCM-41/Hal catalyst reveals 100 % benzene and ca. 89–90 % ethylbenzene and toluene conversion at the temperature range of 100–150°С for 3 h.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107686"},"PeriodicalIF":5.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel protocol for detection and quantification of SARS-CoV-2 virus based on settlement rates of clay-virus-electrolyte mixture

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-25 DOI: 10.1016/j.clay.2024.107680

Himanshu Yadav , Deepa Mehta , Tadikonda Venkata Bharat , Sachin Kumar

Detection and quantification of a virus play a crucial role in diagnosis, determination of infection stage, and decision on treatment strategies. Further, it plays a crucial role in monitoring the disease propagation during the pandemic. A wide range of analytical methods are used to detect and quantify viruses. The currently available methods are, however, laborious, costly, and time-consuming. Also, the accuracy of many of these methods is debatable. We propose a novel method for the detection and quantification of coronavirus based on the clay–virus–electrolyte interaction using the sedimentation method. Newcastle disease virus (NDV), a Coronavirus surrogate (CS), and Infectious bronchitis virus (IBV), an avian coronavirus, were used in this study. Due to changes in inter-particle forces of clay in the presence of the virus, the sedimentation rate of the clay-electrolyte system changed. A protocol was thus developed based on the changes in the sedimentation rate to predict the presence and quantity of the given virus. The sedimentation rates were recorded by mixing the bentonite clay with the CS or IBV and 0.1 M NaCl electrolyte solution at a solid-to-liquid ratio of 1:50. The sedimentation rates were varied with different CS concentrations due to different particle-particle associations due to the sorption of virus particles on the clay surface. The proposed method was successfully validated for using the plaque assay techniques for CS virus and RT-PCR for the IBV. The proposed method is simple, cost-effective, and very useful for the detection of coronavirus and other viruses' presence and quantification. Moreover, the methodology is useful to diagnose the Newcastle disease virus (NDV), which causes infection among several avian species during avian outbreaks.

{"title":"A novel protocol for detection and quantification of SARS-CoV-2 virus based on settlement rates of clay-virus-electrolyte mixture","authors":"Himanshu Yadav , Deepa Mehta , Tadikonda Venkata Bharat , Sachin Kumar","doi":"10.1016/j.clay.2024.107680","DOIUrl":"10.1016/j.clay.2024.107680","url":null,"abstract":"<div><div>Detection and quantification of a virus play a crucial role in diagnosis, determination of infection stage, and decision on treatment strategies. Further, it plays a crucial role in monitoring the disease propagation during the pandemic. A wide range of analytical methods are used to detect and quantify viruses. The currently available methods are, however, laborious, costly, and time-consuming. Also, the accuracy of many of these methods is debatable. We propose a novel method for the detection and quantification of coronavirus based on the clay–virus–electrolyte interaction using the sedimentation method. Newcastle disease virus (NDV), a Coronavirus surrogate (CS), and Infectious bronchitis virus (IBV), an avian coronavirus, were used in this study. Due to changes in inter-particle forces of clay in the presence of the virus, the sedimentation rate of the clay-electrolyte system changed. A protocol was thus developed based on the changes in the sedimentation rate to predict the presence and quantity of the given virus. The sedimentation rates were recorded by mixing the bentonite clay with the CS or IBV and 0.1 M NaCl electrolyte solution at a solid-to-liquid ratio of 1:50. The sedimentation rates were varied with different CS concentrations due to different particle-particle associations due to the sorption of virus particles on the clay surface. The proposed method was successfully validated for using the plaque assay techniques for CS virus and RT-PCR for the IBV. The proposed method is simple, cost-effective, and very useful for the detection of coronavirus and other viruses' presence and quantification. Moreover, the methodology is useful to diagnose the Newcastle disease virus (NDV), which causes infection among several avian species during avian outbreaks.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107680"},"PeriodicalIF":5.3,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sonochemically improved regeneration of mechanically amorphized Ca2Cr-layered double hydroxides – Synthesis, characterization and photocatalytic lidocaine decomposition

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-24 DOI: 10.1016/j.clay.2024.107684

Vivien Szabó , Rebeka Mészáros , Bence Kutus , Gergely Ferenc Samu , Zoltán Kónya , Ákos Kukovecz , Pál Sipos , Márton Szabados

Our aim was to extend the structure recovery method previously seen for mechanochemically amorphized Ca₂Fe-layered double hydroxides (LDH) to additional LDHs and to further improve it by utilizing ultrasonic irradiation. Work commenced with the synthesis of Ca₂Cr-LDH, under the developed optimal conditions of unusually high alkali concentration (9 M NaOH) and mild heating (50 °C). Comparing ultrasonic treatment with mechanical mixing, sonication was able to recover the original structure twice as fast, reduce the direct optical band gaps of LDHs by larger extent, while the surface Cr^VI content decreased by nearly 20 %. Without base addition, Ca₂M-hydrocalumites (M^III: Al, Sc, V, Cr, Fe, Ga, In) was used as sacrificial templates in lidocaine photomineralization by forming active M^III hydroxides and oxide particles. LDH-derived Cr(OH)₃ proved to be a robust and reusable catalyst, with efficiencies ahead of many semiconductors such as SnO₂, BiOBr, WO₃, SrTiO₃ and ZnO. At pH 12, dissolution of Ca₂Cr-LDHs was inhibited, so that the catalytic effects of pre-milling and structural restoration could be studied. Performance of Ca₂Cr-LDHs nearly doubled after grinding, while a small increase was observed for Mg₂Cr- and a decrease for Zn₂Cr-LDHs. However, with appropriate structural recovery, activity of all LDHs was enhanced compared to the initial or ground solids. Benefits of ultrasonic recovery in catalysis over mechanical stirring have also been demonstrated and highlighted key aspects of the efficiency of structure recovery in the significantly different hydrocalumite−hydrotalcite systems.

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引用次数: 0

Phosphorus removal by concrete-based layered double hydroxides: The influence of titration mode for continuous flow coprecipitation

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-24 DOI: 10.1016/j.clay.2024.107682

Xiao Liu, Yaze Zhi, Yue Yuan, Huiyuan Zhong, Yanhua Chen, Guoyuan Shi, Mei Yang

The global phosphorus (P) crisis and eutrophication promotes the development of dephosphorization technology from wastewater. To seek an effective and sustainable way for phosphorus removal, concrete-based layered double hydroxides (C-LDH) was synthesized from waste concrete by continuous flow coprecipitation method. Results indicated that the dropping mode of the titration had significant effects on the property of C-LDH. The product of single-point titration coprecipitation (C-LDH_S) presented developing flakes morphology, which contained more Ca/Al-LDH and a certain amount of Mg/Al-LDH, while the product of multipoint titration coprecipitation (C-LDH_M) exhibited a good hexagonal morphology and contained more Mg/Al-LDH. C-LDH_M provided more valid adsorption sites and higher adsorption energy for phosphorus, resulting in a larger adsorption capacity. Ca/Al-LDH in C-LDH tended to dissolve when the environmental pH value was lower than its formed pH, but Mg/Al-LDH remained, the difference between the two components brought about different P-uptake efficiency and mechanism between C-LDH_S and C-LDH_M. The dissolution of Ca/Al-LDH from C-LDH_S initiated the dephosphorization way dominated by CaP precipitation, whereas the more reservation of Mg/Al-LDH in C-LDH_M derived more P-uptake by adsorption. The phosphorus held by C-LDH_M presented better recyclability. The overall results indicated that C-LDH_M was an economical and sustainable candidate for phosphorus removal.

{"title":"Phosphorus removal by concrete-based layered double hydroxides: The influence of titration mode for continuous flow coprecipitation","authors":"Xiao Liu, Yaze Zhi, Yue Yuan, Huiyuan Zhong, Yanhua Chen, Guoyuan Shi, Mei Yang","doi":"10.1016/j.clay.2024.107682","DOIUrl":"10.1016/j.clay.2024.107682","url":null,"abstract":"<div><div>The global phosphorus (P) crisis and eutrophication promotes the development of dephosphorization technology from wastewater. To seek an effective and sustainable way for phosphorus removal, concrete-based layered double hydroxides (C-LDH) was synthesized from waste concrete by continuous flow coprecipitation method. Results indicated that the dropping mode of the titration had significant effects on the property of C-LDH. The product of single-point titration coprecipitation (C-LDH<sub>S</sub>) presented developing flakes morphology, which contained more Ca/Al-LDH and a certain amount of Mg/Al-LDH, while the product of multipoint titration coprecipitation (C-LDH<sub>M</sub>) exhibited a good hexagonal morphology and contained more Mg/Al-LDH. C-LDH<sub>M</sub> provided more valid adsorption sites and higher adsorption energy for phosphorus, resulting in a larger adsorption capacity. Ca/Al-LDH in C-LDH tended to dissolve when the environmental pH value was lower than its formed pH, but Mg/Al-LDH remained, the difference between the two components brought about different P-uptake efficiency and mechanism between C-LDH<sub>S</sub> and C-LDH<sub>M</sub>. The dissolution of Ca/Al-LDH from C-LDH<sub>S</sub> initiated the dephosphorization way dominated by Ca<img>P precipitation, whereas the more reservation of Mg/Al-LDH in C-LDH<sub>M</sub> derived more P-uptake by adsorption. The phosphorus held by C-LDH<sub>M</sub> presented better recyclability. The overall results indicated that C-LDH<sub>M</sub> was an economical and sustainable candidate for phosphorus removal.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107682"},"PeriodicalIF":5.3,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of MgO-based cementitious binder on smectites

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2024-12-20 DOI: 10.1016/j.clay.2024.107677

Wolfgang Jan Zucha , Ellina Bernard , Raphael Kuhn , Michael Plötze , Alexander Puzrin

Earth materials are subsoils used in construction due to their natural cementing properties. These properties originates from its clay fraction, which becomes cohesive during drying. Unlike common cement, earth materials are recyclable and have no CO₂ emission apart from manufacturing. Unfortunately, earth materials containing the abundant clay mineral smectite exhibit large swelling and shrinkage strains. Such earth materials are considered unsuitable for construction unless a stabiliser is added, which is commonly Portland cement or quicklime. This study explored the use of MgO-based cementitious Binder (MB) as alternative with a focus on the mineralogical effect of MB on smectite during hydration. A series of MB/smectite blends and MB components/smectite was cured up to six months to investigate the mineralogical changes and the formation of magnesium (alumino) silicate hydrate. The results showed that MB transformed smectite into Mg-hydroxy-interlayered smectite (Mg-HIS) within hours. The reason is the dissolution of MgO, a main constituent of MB. The dissolved Mg precipitates as Mg-hydroxy in the interlayer and transforms the smectite to Mg-HIS in this process. This is causing a pH increase and may prevent a complete HIS formation as the MgO dissolution mechanism will change once the pH is above the point-of-zero charge of MgO. An advantage of the smectite to Mg-HIS transformation is the strongly reduced the swelling/shrinkage properties of the clay. This suggests that adding MB to smectite could be a superior binding approach compared to quicklime, which primarily causes clay particle flocculation.

{"title":"Effects of MgO-based cementitious binder on smectites","authors":"Wolfgang Jan Zucha , Ellina Bernard , Raphael Kuhn , Michael Plötze , Alexander Puzrin","doi":"10.1016/j.clay.2024.107677","DOIUrl":"10.1016/j.clay.2024.107677","url":null,"abstract":"<div><div>Earth materials are subsoils used in construction due to their natural cementing properties. These properties originates from its clay fraction, which becomes cohesive during drying. Unlike common cement, earth materials are recyclable and have no CO<sub>2</sub> emission apart from manufacturing. Unfortunately, earth materials containing the abundant clay mineral smectite exhibit large swelling and shrinkage strains. Such earth materials are considered unsuitable for construction unless a stabiliser is added, which is commonly Portland cement or quicklime. This study explored the use of MgO-based cementitious Binder (MB) as alternative with a focus on the mineralogical effect of MB on smectite during hydration. A series of MB/smectite blends and MB components/smectite was cured up to six months to investigate the mineralogical changes and the formation of magnesium (alumino) silicate hydrate. The results showed that MB transformed smectite into Mg-hydroxy-interlayered smectite (Mg-HIS) within hours. The reason is the dissolution of MgO, a main constituent of MB. The dissolved Mg precipitates as Mg-hydroxy in the interlayer and transforms the smectite to Mg-HIS in this process. This is causing a pH increase and may prevent a complete HIS formation as the MgO dissolution mechanism will change once the pH is above the point-of-zero charge of MgO. An advantage of the smectite to Mg-HIS transformation is the strongly reduced the swelling/shrinkage properties of the clay. This suggests that adding MB to smectite could be a superior binding approach compared to quicklime, which primarily causes clay particle flocculation.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"265 ","pages":"Article 107677"},"PeriodicalIF":5.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143155818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0