Pub Date : 2024-08-20DOI: 10.1134/s1070427224020071
Xiaozhen Chen, Li Liu, Chengmin Yang, Bumei Zheng, Xiaoying Yin, Jin Sun, Yunhai Yao, Weiyu Duan
Abstract
The structure and surface properties of the industrial silicon trapping catalysts were characterized by XRF, XPS, XRD, NH3-TPD and NMR. The silicon trapping mechanism of the industrial silicon trapping catalyst was discussed. The results showed that the silicon capacity reached 28.17% during this lifetime. The captured silicon mainly existed on the surface of the silicon trapping catalyst as amorphous silicon with abundant Q species including Si(OSi)4, Si(OSi)3(OX), Si(OSi)2(OX)2, and Si(OSi)(OX)3, proving the silicon was caputured as the amorphous silicon bilayer deposition model. After silicon deposition, the pore properties of the silicon trapping catalyst changed greatly. Compared with the fresh catalyst, the specific surface area and pore volume of the spent industrial silicon trapping catalyst decreased by 49.17% and 22.92% respectively. The deposition of silicon leaded to the loss of acid sites and changed the interaction between the support and the active metal, which result in the reduction of the number of active metal species. This may explain how the deposited silicon is related to the deactivation of the hydrotreating catalysts.
{"title":"Influence of the Silicon Deposition on the Industrial Silicon Trapping Catalyst","authors":"Xiaozhen Chen, Li Liu, Chengmin Yang, Bumei Zheng, Xiaoying Yin, Jin Sun, Yunhai Yao, Weiyu Duan","doi":"10.1134/s1070427224020071","DOIUrl":"https://doi.org/10.1134/s1070427224020071","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The structure and surface properties of the industrial silicon trapping catalysts were characterized by XRF, XPS, XRD, NH<sub>3</sub>-TPD and NMR. The silicon trapping mechanism of the industrial silicon trapping catalyst was discussed. The results showed that the silicon capacity reached 28.17% during this lifetime. The captured silicon mainly existed on the surface of the silicon trapping catalyst as amorphous silicon with abundant Q species including Si(OSi)<sub>4</sub>, Si(OSi)<sub>3</sub>(OX), Si(OSi)<sub>2</sub>(OX)<sub>2</sub>, and Si(OSi)(OX)<sub>3</sub>, proving the silicon was caputured as the amorphous silicon bilayer deposition model. After silicon deposition, the pore properties of the silicon trapping catalyst changed greatly. Compared with the fresh catalyst, the specific surface area and pore volume of the spent industrial silicon trapping catalyst decreased by 49.17% and 22.92% respectively. The deposition of silicon leaded to the loss of acid sites and changed the interaction between the support and the active metal, which result in the reduction of the number of active metal species. This may explain how the deposited silicon is related to the deactivation of the hydrotreating catalysts.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-20DOI: 10.1134/s1070427224020162
Asghar Saberi, Vahid Javanbakht
Abstract
Plain carbon steel is the most important group of engineering alloys with a wide range of applications. Electroless Ni–P coating has been attracting extensive attention because it exhibits excellent wear and corrosion resistance for steel. The present study aims to steel coating with a nanocomposite of nickel-phosphorus-hexagonal boron nitride (Ni-P-hBN) and investigate the abrasion and corrosion resistance, and its adhesion to the substrate. For this purpose, the nickel-phosphorus electroless coating was used as a substrate, and hexagonal boron nitride nanoparticles as a modifier. The coating properties were investigated by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results showed that boron nitride with 3 g/L concentration afforded the best coating performance with a friction coefficient of 0.19.
{"title":"Investigation of the Tribological and Mechanical Properties of Electroless Ni-P-hBN Nano-Composite Coating","authors":"Asghar Saberi, Vahid Javanbakht","doi":"10.1134/s1070427224020162","DOIUrl":"https://doi.org/10.1134/s1070427224020162","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Plain carbon steel is the most important group of engineering alloys with a wide range of applications. Electroless Ni–P coating has been attracting extensive attention because it exhibits excellent wear and corrosion resistance for steel. The present study aims to steel coating with a nanocomposite of nickel-phosphorus-hexagonal boron nitride (Ni-P-hBN) and investigate the abrasion and corrosion resistance, and its adhesion to the substrate. For this purpose, the nickel-phosphorus electroless coating was used as a substrate, and hexagonal boron nitride nanoparticles as a modifier. The coating properties were investigated by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results showed that boron nitride with 3 g/L concentration afforded the best coating performance with a friction coefficient of 0.19.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-20DOI: 10.1134/s1070427224020149
Mohammed F. Silwadi, A. H. Bhat, Alathraa Mubarak Alrahbi, Hala Qassim Albattashi, Fatma Ali Albattashi, Hanan Saif Alabri
Abstract
This study describes the fabrication and characterization of nanocomposite hydrogel beads based on Cellulose and synthesized silver nanoparticles (Ag-NPs) prepared by insitu and exsitu methods. The silver nanoparticles were synthesized by reducing silver nitrate (AgNO3) by Sodium borohydrate (NaBH4). Cellulose/Ag-NPs hydrogel beads were prepared using calcium chloride as the cross-linker. The hydrogel beads were characterized using FTIR and XRD. Moreover, swelling property of the cellulose /Ag-NPs hydrogel beads was investigated. The Ag release profile of the hydrogels was obtained for the amount of Ag released using Atomic Absorption spectroscopy (AAS). The cumulative release of Ag-NPs was estimated by measuring the absorbance at 405 nm of samples obtained at various time intervals. The exsitu and insitu nanocomposite hydrogels showed greater swelling behavior in comparison with virgin cellulose hydrogel. Both insitu and exsitu cellulose/Ag-NPs presented good antibacterial activities against Escherichia coli and Bacillus and with maximum zones of inhibition 12 ± 2 mm more than the pristine cellulose hydrogel thereby, have great pharmacological potential and a suitable level of safety for use in the biological systems.
{"title":"Bio-Nanocomposite Hydrogel Beads Based on Cellulose and Biogenic Silver Nanoparticles Prepared by ex-situ and in-situ Methods for Antibacterial Applications","authors":"Mohammed F. Silwadi, A. H. Bhat, Alathraa Mubarak Alrahbi, Hala Qassim Albattashi, Fatma Ali Albattashi, Hanan Saif Alabri","doi":"10.1134/s1070427224020149","DOIUrl":"https://doi.org/10.1134/s1070427224020149","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This study describes the fabrication and characterization of nanocomposite hydrogel beads based on Cellulose and synthesized silver nanoparticles (Ag-NPs) prepared by insitu and exsitu methods. The silver nanoparticles were synthesized by reducing silver nitrate (AgNO<sub>3</sub>) by Sodium borohydrate (NaBH<sub>4</sub>). Cellulose/Ag-NPs hydrogel beads were prepared using calcium chloride as the cross-linker. The hydrogel beads were characterized using FTIR and XRD. Moreover, swelling property of the cellulose /Ag-NPs hydrogel beads was investigated. The Ag release profile of the hydrogels was obtained for the amount of Ag released using Atomic Absorption spectroscopy (AAS). The cumulative release of Ag-NPs was estimated by measuring the absorbance at 405 nm of samples obtained at various time intervals. The exsitu and insitu nanocomposite hydrogels showed greater swelling behavior in comparison with virgin cellulose hydrogel. Both insitu and exsitu cellulose/Ag-NPs presented good antibacterial activities against Escherichia coli and Bacillus and with maximum zones of inhibition 12 ± 2 mm more than the pristine cellulose hydrogel thereby, have great pharmacological potential and a suitable level of safety for use in the biological systems.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Water resources are crucial for human life. However, current water resource treatment methods have limitations. In this regard, photocatalysis is a promising water resource treatment technology with a simple operation, green environmental protection, and high economic benefits. Therefore, this study prepared a Co-TiO2/Ag3PO4 (CTAP) photocatalyst for the treatment of water resources. Here, a Co-TiO2/Ag3PO4 photocatalyst was prepared using a hydrothermal method combined with calcination. Under visible light irradiation, the methylene blue (MB) degradation degree of CTAP composite reached 96.4% within 14 min, and the degradation rate constant was 0.23516 min–1. These reaction rates are 137 and 3.4 times higher than those of pure TiO2 and Ag3PO4 samples, respectively. Thus, doping and heterojunctions significantly improved the photocatalytic performance of CTAP composites, primarily due to grain size reduction of TiO2 after Co2+ doping. The formation of a close interfacial connection with Ag3PO4 increased the active site of the reaction and promoted the transfer of photogenerated charges, thus improving the photocatalytic performance of CTAP composites. According to the photocatalytic capture experiments of the active species, e-, h+, •O2–, and •OH play a common role in the degradation of MB. This paper provides insights into the design and preparation of a Z-scheme photocatalyst that can be considered for the degradation of pollutants in water.
{"title":"Fabrication and Assessment of Co-TiO2/Ag3PO4 Z-Scheme Photocatalyst for Improved Methylene Blue Degradation","authors":"Mingxia Tian, Xindong Wang, Yumin Yan, Yuan Zhang, Guyu Zhang, Tianyi Cui, Jianbo Zhao, Jianhui Jiang","doi":"10.1134/s1070427224020150","DOIUrl":"https://doi.org/10.1134/s1070427224020150","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Water resources are crucial for human life. However, current water resource treatment methods have limitations. In this regard, photocatalysis is a promising water resource treatment technology with a simple operation, green environmental protection, and high economic benefits. Therefore, this study prepared a Co-TiO<sub>2</sub>/Ag<sub>3</sub>PO<sub>4</sub> (CTAP) photocatalyst for the treatment of water resources. Here, a Co-TiO<sub>2</sub>/Ag<sub>3</sub>PO<sub>4</sub> photocatalyst was prepared using a hydrothermal method combined with calcination. Under visible light irradiation, the methylene blue (MB) degradation degree of CTAP composite reached 96.4% within 14 min, and the degradation rate constant was 0.23516 min<sup>–1</sup>. These reaction rates are 137 and 3.4 times higher than those of pure TiO<sub>2</sub> and Ag<sub>3</sub>PO<sub>4</sub> samples, respectively. Thus, doping and heterojunctions significantly improved the photocatalytic performance of CTAP composites, primarily due to grain size reduction of TiO<sub>2</sub> after Co<sup>2+</sup> doping. The formation of a close interfacial connection with Ag<sub>3</sub>PO<sub>4</sub> increased the active site of the reaction and promoted the transfer of photogenerated charges, thus improving the photocatalytic performance of CTAP composites. According to the photocatalytic capture experiments of the active species, e<sup>-</sup>, h<sup>+</sup>, <sup>•</sup>O<sup>2–</sup>, and <sup>•</sup>OH play a common role in the degradation of MB. This paper provides insights into the design and preparation of a Z-scheme photocatalyst that can be considered for the degradation of pollutants in water.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-20DOI: 10.1134/s1070427224020095
W. M. Youssef, A. A. Elzoghby, E. M. Helmy, Khalil A. Khalil, H. S. Gado, A. A. Rateb
Abstract
Purification of phosphoric acid (H3PO4) is considered major problem and several ways have been evaluated. In this study, two different types of clay, raw kaolinite clay (RKC) and chemical kaolinite clay (CKC) were used for the removal of organic matter (OM). The used samples were characterized by X-ray diffraction, SEM, FT-IR, and chemical analysis. The adsorptive capacities of the samples were investigated by using them to adsorb organic matter from crude-strength phosphoric acid. Removal of organic matter from crude phosphoric acid was carried out by adsorption using RKC and СKC minerals. The different factors affecting the adsorption process were investigated. The experimental data exhibited that the clay treated with sulfuric acid had the highest organic matter adsorption capacity. The equilibrium adsorption data were analyzed using the Langmuir and Freundlich isotherms. The results showed that the equilibrium adsorption capacities for the two adsorbents followed the Langmuir model.
{"title":"Studying the Effect of Chemical Activated Kaolinite on Organic Matter Adsorption from Crude Phosphoric Acid (H3PO4)","authors":"W. M. Youssef, A. A. Elzoghby, E. M. Helmy, Khalil A. Khalil, H. S. Gado, A. A. Rateb","doi":"10.1134/s1070427224020095","DOIUrl":"https://doi.org/10.1134/s1070427224020095","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Purification of phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) is considered major problem and several ways have been evaluated. In this study, two different types of clay, raw kaolinite clay (RKC) and chemical kaolinite clay (CKC) were used for the removal of organic matter (OM). The used samples were characterized by X-ray diffraction, SEM, FT-IR, and chemical analysis. The adsorptive capacities of the samples were investigated by using them to adsorb organic matter from crude-strength phosphoric acid. Removal of organic matter from crude phosphoric acid was carried out by adsorption using RKC and СKC minerals. The different factors affecting the adsorption process were investigated. The experimental data exhibited that the clay treated with sulfuric acid had the highest organic matter adsorption capacity. The equilibrium adsorption data were analyzed using the Langmuir and Freundlich isotherms. The results showed that the equilibrium adsorption capacities for the two adsorbents followed the Langmuir model.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Au nanoparticles loaded on biochar (PDA-BC/Au) was prepared using adhesion and reduction properties of polydopamine by in-situ reduction method. PDA-BC/Au was characterized by the specific surface area analyzer (BET), the scanning electron microscope (SEM), the transmission electron microscopy (TEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometry (FTIR). Analysis results prove the successful synthesis of composites decorated with Au nanoparticles in the biochar matrix coating with polydopamine layer. PDA-BC/Au was employed as an adsorbent to remove the cationic dyes (MB and MG) from aqueous solution. The tests confirm that PDA-BC/Au can remove up to 99.0% of MB within 30 min and achieve removal rate over 97.2% of MG after 60 min adsorption. Adsorption kinetics and isotherm models reflect that the adsorption of dyes by PDA-BC/Au has a better fit with pseudo-secondary kinetic equation and the Langmuir adsorption model, displaying chemisorption-dominated single-molecule layer adsorption mechanism. Additionally, after five recycling cycles, the removal rates of PDA-BC/Au for MB and MG only dropped by 3.10 and 2.58% respectively, making clear good stability for long term use. Collectively, the developed PDA-BC/Au adsorbent indicates enormous promise for cationic dye removal and efficient utilization of waste biomass resources.
{"title":"Preparation of Au Nanoparticle Loaded Biochar/Polydopamine Composites for Adsorption of MB and MG Dyes from Aqueous Solution","authors":"Hui Li, Dongxue Shen, Zhe Yang, Guojia Ji, Zhiwei Zhang, Xulin Lu, Jingmei Zhang, Zhongbao Zhao","doi":"10.1134/s1070427224020113","DOIUrl":"https://doi.org/10.1134/s1070427224020113","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Au nanoparticles loaded on biochar (PDA-BC/Au) was prepared using adhesion and reduction properties of polydopamine by in-situ reduction method. PDA-BC/Au was characterized by the specific surface area analyzer (BET), the scanning electron microscope (SEM), the transmission electron microscopy (TEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometry (FTIR). Analysis results prove the successful synthesis of composites decorated with Au nanoparticles in the biochar matrix coating with polydopamine layer. PDA-BC/Au was employed as an adsorbent to remove the cationic dyes (MB and MG) from aqueous solution. The tests confirm that PDA-BC/Au can remove up to 99.0% of MB within 30 min and achieve removal rate over 97.2% of MG after 60 min adsorption. Adsorption kinetics and isotherm models reflect that the adsorption of dyes by PDA-BC/Au has a better fit with pseudo-secondary kinetic equation and the Langmuir adsorption model, displaying chemisorption-dominated single-molecule layer adsorption mechanism. Additionally, after five recycling cycles, the removal rates of PDA-BC/Au for MB and MG only dropped by 3.10 and 2.58% respectively, making clear good stability for long term use. Collectively, the developed PDA-BC/Au adsorbent indicates enormous promise for cationic dye removal and efficient utilization of waste biomass resources.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142186433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Creating polymeric microbeads that can respond to stimuli and deliver drugs has various practical uses in the pharmaceutical industry. To address this need, we have developed a new type of pH-sensitive polymeric microbeads that can be used as carriers for drug delivery applications. The gelation method was used to create microbeads incorporated with reduced graphene oxide (rGO) for the controlled release of metronidazole using sodium alginate and locust bean gum. The synthesized rGO and microbeads were analyzed by FTIR, XRD, and SEM. In vitro release and swelling studies were performed at pH 7.4 and 2.0 at 37 oC. The release kinetics and mechanism are analyzed by fitting the release data into various kinetics models. The antibacterial activity of the generated microbeads was tested against B. subtilis, L. acidophilus, and S. mutans. The results suggest that the developed microbeads may serve as effective carriers for antibacterial treatment.
{"title":"Preparation and Characterization of Polymeric Microbeads Incorporated with Reduced Graphene Oxide for Drug Delivery and Antibacterial Applications","authors":"Dharmender Pallerla, Sreekanth Reddy Obireddy, Jithendra Thammineni, Manohara Reddy Busha, Prasoona Gumpula, Sunkari Jyothi","doi":"10.1134/s1070427224020085","DOIUrl":"https://doi.org/10.1134/s1070427224020085","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Creating polymeric microbeads that can respond to stimuli and deliver drugs has various practical uses in the pharmaceutical industry. To address this need, we have developed a new type of pH-sensitive polymeric microbeads that can be used as carriers for drug delivery applications. The gelation method was used to create microbeads incorporated with reduced graphene oxide (rGO) for the controlled release of metronidazole using sodium alginate and locust bean gum. The synthesized rGO and microbeads were analyzed by FTIR, XRD, and SEM. <i>In vitro</i> release and swelling studies were performed at pH 7.4 and 2.0 at 37 <sup>o</sup>C. The release kinetics and mechanism are analyzed by fitting the release data into various kinetics models. The antibacterial activity of the generated microbeads was tested against <i>B. subtilis, L. acidophilus</i>, and<i> S. mutans</i>. The results suggest that the developed microbeads may serve as effective carriers for antibacterial treatment.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1134/s1070427223110061
Sh. M. Nasibova, R. A. Rahimov, G. A. Ahmadova, A. Z. Abilova
Abstract
Ionic liquid (IL) surfactants were prepared from 1-bromododecane and ethanolamines (2-dimethyl- and 2-diethylethanolamines) in an equimolar ratio to reveal how their oil-collecting and dispersing ability is influenced by the structure of the alkyl fragment. The surface activity of the substances synthesized was studied tensiometrically, and the electrical conductivity, conductometrically. The effect exerted on the colloid-chemical parameters of the surfactants by the replacement of the methyl fragment in the head group by the ethyl fragment is described. The relative oil-collecting and oil-dispersing ability of these substances was evaluated under laboratory conditions by the example of a thin oil film on the surface of waters with different levels of mineralization.
{"title":"Dependence of the Oil-Collecting and Oil-Dispersing Ability of Surfactants on the Kind of Alkyl Radicals in Their Head Group","authors":"Sh. M. Nasibova, R. A. Rahimov, G. A. Ahmadova, A. Z. Abilova","doi":"10.1134/s1070427223110061","DOIUrl":"https://doi.org/10.1134/s1070427223110061","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Ionic liquid (IL) surfactants were prepared from 1-bromododecane and ethanolamines (2-dimethyl- and 2-diethylethanolamines) in an equimolar ratio to reveal how their oil-collecting and dispersing ability is influenced by the structure of the alkyl fragment. The surface activity of the substances synthesized was studied tensiometrically, and the electrical conductivity, conductometrically. The effect exerted on the colloid-chemical parameters of the surfactants by the replacement of the methyl fragment in the head group by the ethyl fragment is described. The relative oil-collecting and oil-dispersing ability of these substances was evaluated under laboratory conditions by the example of a thin oil film on the surface of waters with different levels of mineralization.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141717332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1134/s1070427223110012
Yu. A. Rodikova, T. Yu. Kardash, E. G. Zhizhina
Abstract
The possibility of preparing mixed Keggin-type heteropoly compounds by introducing catalytically active vanadium(V) atoms activated by the peroxide method into the framework of Mo- and W-containing heteropoly anions was demonstrated. The pretreatment of the required amount of vanadium(V) in the form of V2O5 with a concentrated H2O2 solution ensures a considerable decrease in the content of foreign ions in solutions of heteropoly compounds and in salts based on them. Incorporation of vanadium(V) atoms into the heteropoly anion framework with preservation of the structural integrity was proved by the example of acidic salts Cs3.5H0.5PMo11VO40, Cs3.5H0.5PW11VO40, and Cs4.5H0.5SiW11VO40. The textural characteristics of the target compounds were studied, their thermograms were recorded, and the phase composition was determined. High stability and low solubility of the Cs-containing salts in three cycles of hydrothermal treatment were demonstrated.
{"title":"Use of the Peroxide Method for Vanadium Activation to Obtain Mixed Keggin-Type Heteropoly Compounds","authors":"Yu. A. Rodikova, T. Yu. Kardash, E. G. Zhizhina","doi":"10.1134/s1070427223110012","DOIUrl":"https://doi.org/10.1134/s1070427223110012","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibility of preparing mixed Keggin-type heteropoly compounds by introducing catalytically active vanadium(V) atoms activated by the peroxide method into the framework of Mo- and W-containing heteropoly anions was demonstrated. The pretreatment of the required amount of vanadium(V) in the form of V<sub>2</sub>O<sub>5</sub> with a concentrated H<sub>2</sub>O<sub>2</sub> solution ensures a considerable decrease in the content of foreign ions in solutions of heteropoly compounds and in salts based on them. Incorporation of vanadium(V) atoms into the heteropoly anion framework with preservation of the structural integrity was proved by the example of acidic salts Cs<sub>3.5</sub>H<sub>0.5</sub>PMo<sub>11</sub>VO<sub>40</sub>, Cs<sub>3.5</sub>H<sub>0.5</sub>PW<sub>11</sub>VO<sub>40</sub>, and Cs<sub>4.5</sub>H<sub>0.5</sub>SiW<sub>11</sub>VO<sub>40</sub>. The textural characteristics of the target compounds were studied, their thermograms were recorded, and the phase composition was determined. High stability and low solubility of the Cs-containing salts in three cycles of hydrothermal treatment were demonstrated.</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141717328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1134/s1070427223110048
E. A. Roldugina, S. V. Kardashev, A. L. Maximov
Abstract
Pt- and Pd-containing catalysts based on the mesoporous aluminosilicate Al–HMS (Hexagonal Mesoporous Silica) with the Si/Al ratio of 10 were synthesized. The catalysts were tested in furfural hydrogenation in an aqueous medium at a hydrogen pressure of 1–5 MPa in the temperature interval 100–200°С. At 100°C, furfural transformed mainly into furfuryl alcohol, and at 200°С, into cyclopentanone (3 MPa of Н2, 1 h). In the presence of the Pd/Al–HMS catalyst, the conversion and selectivity of formation of tetrahydrofurfuryl alcohol increased with an increase in the initial hydrogen pressure or in the catalyst concentration (100°С, 1 h). Pd/Al–HMS is more active in furfural hydrogenation in an aqueous medium: With this catalyst, virtually complete furfural conversion was reached in the temperature interval 150–200°С, whereas with Pt/Al–HMS the conversion did not exceed 23% (3 MPa of Н2, 1 h).
{"title":"Hydrogenation of Furfural on Pt- and Pd-Containing Catalysts in an Aqueous Medium","authors":"E. A. Roldugina, S. V. Kardashev, A. L. Maximov","doi":"10.1134/s1070427223110048","DOIUrl":"https://doi.org/10.1134/s1070427223110048","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Pt- and Pd-containing catalysts based on the mesoporous aluminosilicate Al–HMS (Hexagonal Mesoporous Silica) with the Si/Al ratio of 10 were synthesized. The catalysts were tested in furfural hydrogenation in an aqueous medium at a hydrogen pressure of 1–5 MPa in the temperature interval 100–200°С. At 100°C, furfural transformed mainly into furfuryl alcohol, and at 200°С, into cyclopentanone (3 MPa of Н<sub>2</sub>, 1 h). In the presence of the Pd/Al–HMS catalyst, the conversion and selectivity of formation of tetrahydrofurfuryl alcohol increased with an increase in the initial hydrogen pressure or in the catalyst concentration (100°С, 1 h). Pd/Al–HMS is more active in furfural hydrogenation in an aqueous medium: With this catalyst, virtually complete furfural conversion was reached in the temperature interval 150–200°С, whereas with Pt/Al–HMS the conversion did not exceed 23% (3 MPa of Н<sub>2</sub>, 1 h).</p>","PeriodicalId":757,"journal":{"name":"Russian Journal of Applied Chemistry","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141717330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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