Pub Date : 2025-08-01DOI: 10.15251/djnb.2025.203.843
Y. X. Liu, X. R. Zhu, X. Sun, W. Yan, J. Xu
The cocatalyst is crucial in promoting charge separation and surface reaction kinetics in the photocatalytic process. In this study, a novel photocatalyst was prepared via a one-step hydrothermal approach, integrating the commonly used semiconductor material cadmium sulfide with activated carbon (AC), forming a Schottky junction between them. The interfacial C-S bond between CdS and AC serves as an atomic-scale electron transfer pathway, lowering the interfacial charge transfer barrier. The synergistic effect of the Schottky junction and the C-S chemical bond improves the efficiency of e-h pair separation and effectively optimizes charge transfer dynamics. Moreover, the specific surface area of activated carbon (AC) is high, which gives the composite a certain adsorption capacity. Experimental results indicate that when the concentration of TCH is 20 mg/L, the photocatalytic degradation effect of CdS/AC(4:1) was the best. The degradation rate of only 5mg could reach 58.67% in 20 min, far exceeding that of CdS. After 60 minutes, the degradation rate was 77.74%, higher than 60.20% of CdS. This study provides reliable guidance for the design and preparation of low-cost and efficient CdS cocatalysts, and opens up a new general solution and possibility for addressing the environmental pollution resulting from the misuse of antibiotics.
{"title":"CdS/activated carbon composite for the photocatalysis degradation of tetracycline hydrochloride","authors":"Y. X. Liu, X. R. Zhu, X. Sun, W. Yan, J. Xu","doi":"10.15251/djnb.2025.203.843","DOIUrl":"https://doi.org/10.15251/djnb.2025.203.843","url":null,"abstract":"The cocatalyst is crucial in promoting charge separation and surface reaction kinetics in the photocatalytic process. In this study, a novel photocatalyst was prepared via a one-step hydrothermal approach, integrating the commonly used semiconductor material cadmium sulfide with activated carbon (AC), forming a Schottky junction between them. The interfacial C-S bond between CdS and AC serves as an atomic-scale electron transfer pathway, lowering the interfacial charge transfer barrier. The synergistic effect of the Schottky junction and the C-S chemical bond improves the efficiency of e-h pair separation and effectively optimizes charge transfer dynamics. Moreover, the specific surface area of activated carbon (AC) is high, which gives the composite a certain adsorption capacity. Experimental results indicate that when the concentration of TCH is 20 mg/L, the photocatalytic degradation effect of CdS/AC(4:1) was the best. The degradation rate of only 5mg could reach 58.67% in 20 min, far exceeding that of CdS. After 60 minutes, the degradation rate was 77.74%, higher than 60.20% of CdS. This study provides reliable guidance for the design and preparation of low-cost and efficient CdS cocatalysts, and opens up a new general solution and possibility for addressing the environmental pollution resulting from the misuse of antibiotics.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"20 3","pages":"843-857"},"PeriodicalIF":0.0,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147331150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Harvesting energy from water/carbon interfaces represents an eco-friendly approach to addressing the global energy crisis. Unlike conventional nanogenerators utilizing carbon nanomaterials, which typically require integration into specific systems with external pumps for liquid flow, this study presents the fabrication of a novel water-driven energy generator (WEG) utilizing composite films that integrate carbonized lignin, with varying oxygencontaining groups, and thermoplastic polyurethane in an aqueous environment. Upon optimization, the WEG demonstrates remarkable performance, achieving stable output voltage and current of 210 mV and 1.04 μA, respectively. The WEG’s output voltage demonstrated remarkable stability and reproducibility during numerous cyclic bending tests. Furthermore, by simply connecting eight WEGs in series, an elevated voltage of 1.63 V can be achieved, and these scalable units have the capability to directly power commercial electronics, such as light-emitting diodes. This energy conversion technology may provide new insights into the design of WEGs capable of harvesting water energy.
{"title":"Sustainable generation of electricity using carbonized lignin/thermoplastic polyurethane composite films in water","authors":"Zhipeng Zhang, Shiqing Li, Yiheng Zhou, Yu Lei, Wěi Zhāng, Junwei Sha","doi":"10.15251/djnb.2025.202.507","DOIUrl":"https://doi.org/10.15251/djnb.2025.202.507","url":null,"abstract":"Harvesting energy from water/carbon interfaces represents an eco-friendly approach to addressing the global energy crisis. Unlike conventional nanogenerators utilizing carbon nanomaterials, which typically require integration into specific systems with external pumps for liquid flow, this study presents the fabrication of a novel water-driven energy generator (WEG) utilizing composite films that integrate carbonized lignin, with varying oxygencontaining groups, and thermoplastic polyurethane in an aqueous environment. Upon optimization, the WEG demonstrates remarkable performance, achieving stable output voltage and current of 210 mV and 1.04 μA, respectively. The WEG’s output voltage demonstrated remarkable stability and reproducibility during numerous cyclic bending tests. Furthermore, by simply connecting eight WEGs in series, an elevated voltage of 1.63 V can be achieved, and these scalable units have the capability to directly power commercial electronics, such as light-emitting diodes. This energy conversion technology may provide new insights into the design of WEGs capable of harvesting water energy.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"20 2","pages":"507-518"},"PeriodicalIF":0.0,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://doi.org/10.15251/djnb.2025.202.507","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147334078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.15251/djnb.2025.201.23
, X. G. Liu, S. Y. Zeng, , Q. F. Wang, , J. Li, , X. Tong, , J. B. Chen, , D. L. Guo, , H. F. Zhao, , X. H. Chen,
{"title":"Simultaneously reinforce and de-color nanocellulose/lignin composite films by tuning hydroxyl groups with sodium borohydride","authors":", X. G. Liu, S. Y. Zeng, , Q. F. Wang, , J. Li, , X. Tong, , J. B. Chen, , D. L. Guo, , H. F. Zhao, , X. H. Chen,","doi":"10.15251/djnb.2025.201.23","DOIUrl":"https://doi.org/10.15251/djnb.2025.201.23","url":null,"abstract":"","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"20 1","pages":"23-36"},"PeriodicalIF":0.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-15DOI: 10.15251/djnb.2025.201.1
Jicui Dai, C. H. Shen, Qianqian Tian, Xuan Liu, Shanmin Gao, Jun Li, Xin Tong
Carbon paper is commonly used as one of the electrode materials in batteries, where its main function is to serve as a conductive material, providing a channel for electron transport, and also helping to improve the conductivity and stability of the battery. Therefore, it is necessary to study how to improve the performance of carbon paper. This study aims to enhance the performance of carbon paper used in proton exchange membrane fuel cells (PEMFCs) by incorporating lignin-based carbon nanofibers (CNFs). We investigated the effects of different process flows, papermaking methods, and the addition amount of ligninbased carbon fibers on the performance of carbon paper. The research indicates that using the wet papermaking method and the process of electrospinning, impregnation and hot pressing, addition of lignin nanofibers, pre-oxidation, impregnation and hot pressing, and carbonization can yield carbon paper with the best overall performance. The tensile strength is 9.4 mPa, the flexural strength is 390 mPa, the air permeability is 1320 L/m²/s, and the resistivity is 15 mΩ/cm. This significantly improves its mechanical strength, air permeability, and electrical conductivity, making it a promising material for PEMFCs.
{"title":"Properties regulation of carbon paper through incorporating lignin-based carbon nanofibers","authors":"Jicui Dai, C. H. Shen, Qianqian Tian, Xuan Liu, Shanmin Gao, Jun Li, Xin Tong","doi":"10.15251/djnb.2025.201.1","DOIUrl":"https://doi.org/10.15251/djnb.2025.201.1","url":null,"abstract":"Carbon paper is commonly used as one of the electrode materials in batteries, where its main function is to serve as a conductive material, providing a channel for electron transport, and also helping to improve the conductivity and stability of the battery. Therefore, it is necessary to study how to improve the performance of carbon paper. This study aims to enhance the performance of carbon paper used in proton exchange membrane fuel cells (PEMFCs) by incorporating lignin-based carbon nanofibers (CNFs). We investigated the effects of different process flows, papermaking methods, and the addition amount of ligninbased carbon fibers on the performance of carbon paper. The research indicates that using the wet papermaking method and the process of electrospinning, impregnation and hot pressing, addition of lignin nanofibers, pre-oxidation, impregnation and hot pressing, and carbonization can yield carbon paper with the best overall performance. The tensile strength is 9.4 mPa, the flexural strength is 390 mPa, the air permeability is 1320 L/m²/s, and the resistivity is 15 mΩ/cm. This significantly improves its mechanical strength, air permeability, and electrical conductivity, making it a promising material for PEMFCs.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"20 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://doi.org/10.15251/djnb.2025.201.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147334025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1461
K. Y. Li, Y. Zhou, H. Y. Wang, L. K. Zhou, S. P. Zhang, Y. Lian
CdxZn1-xS (x=0~1) solid solution photocatalyst with different morphologies was synthesized by solvothermal method using ethylenediamine as solvent. The light absorption of the photocatalyst was varied by changing the morphology and electronic band structure to allow strong visible light response for hydrogen generation. The results showed that the optimum sample Cd0.5Zn0.5S showed a high hydrogen production rate of 2531.3 μmol·g-1 ·h-1 with lactic acid as sacrificial agent. Loading with NiS by solvothermal method further improves the hydrogen production performance. The photocatalytic hydrogen evolution rate of NiS/Cd0.5Zn0.5S is 4547.5 μmol·g-1 ·h-1 , which is 1.80 times that of pure Cd0.5Zn0.5S. The mechanism of hydrogen production by NiS/Cd0.5Zn0.5S is also discussed.
{"title":"The construction of CdxZn1-xS-based photocatalysts for enhanced hydrogen generation","authors":"K. Y. Li, Y. Zhou, H. Y. Wang, L. K. Zhou, S. P. Zhang, Y. Lian","doi":"10.15251/djnb.2023.184.1461","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1461","url":null,"abstract":"CdxZn1-xS (x=0~1) solid solution photocatalyst with different morphologies was synthesized by solvothermal method using ethylenediamine as solvent. The light absorption of the photocatalyst was varied by changing the morphology and electronic band structure to allow strong visible light response for hydrogen generation. The results showed that the optimum sample Cd0.5Zn0.5S showed a high hydrogen production rate of 2531.3 μmol·g-1 ·h-1 with lactic acid as sacrificial agent. Loading with NiS by solvothermal method further improves the hydrogen production performance. The photocatalytic hydrogen evolution rate of NiS/Cd0.5Zn0.5S is 4547.5 μmol·g-1 ·h-1 , which is 1.80 times that of pure Cd0.5Zn0.5S. The mechanism of hydrogen production by NiS/Cd0.5Zn0.5S is also discussed.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"22 20","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138603211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1485
N. A. Amaran, N. Ibrahim, Z. Mohamed
Pr0.67Ba0.33Mn1-xTixO3 (x = 0 and 0.02) were synthesized using a conventional solid-state synthesis method to investigate the effect of Ti substitution on their magnetic and electrical transport properties. All the samples were structurally evaluated by XRD diffraction Rietveld refinement method which showed an increase in unit cell volume with increasing Ni content, indicating that Ti is partially substituted at Mn. Scanning electron microscopy (SEM) and energy dispersive X-tray (EDX) are used to examine the surface morphology and identified elements in the samples' compounds. Fourier transform infrared spectroscopy (FTIR) reveals that all the samples exhibit a transmission band in the range of 590 cm-1 - 610 cm-1 . For x = 0, magnetization measurements showed paramagnetic (PM) to ferromagnetic (FM) transition at the transition temperature, TC ∼ 213 K. For Ti-substituted samples, ferromagnetic (FM) to PM transition was reduced with Curie temperature (TC), decreasing from 213 K (x = 0) to 205 K (x = 0.02). On the other hand, the M(H) showed the presence of a linear graph for x = 0 and x = 0.02 which may be related to the presence of paramagnetic at room temperature.
{"title":"Investigation of crystal structural and magnetic properties of titanium doped Pr0.67Ba0.33MnO3 perovskite manganites","authors":"N. A. Amaran, N. Ibrahim, Z. Mohamed","doi":"10.15251/djnb.2023.184.1485","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1485","url":null,"abstract":"Pr0.67Ba0.33Mn1-xTixO3 (x = 0 and 0.02) were synthesized using a conventional solid-state synthesis method to investigate the effect of Ti substitution on their magnetic and electrical transport properties. All the samples were structurally evaluated by XRD diffraction Rietveld refinement method which showed an increase in unit cell volume with increasing Ni content, indicating that Ti is partially substituted at Mn. Scanning electron microscopy (SEM) and energy dispersive X-tray (EDX) are used to examine the surface morphology and identified elements in the samples' compounds. Fourier transform infrared spectroscopy (FTIR) reveals that all the samples exhibit a transmission band in the range of 590 cm-1 - 610 cm-1 . For x = 0, magnetization measurements showed paramagnetic (PM) to ferromagnetic (FM) transition at the transition temperature, TC ∼ 213 K. For Ti-substituted samples, ferromagnetic (FM) to PM transition was reduced with Curie temperature (TC), decreasing from 213 K (x = 0) to 205 K (x = 0.02). On the other hand, the M(H) showed the presence of a linear graph for x = 0 and x = 0.02 which may be related to the presence of paramagnetic at room temperature.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"35 20","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1503
N. Vasanth, T. Dons, L. J. Michaelraj, P. Ganesan, S. H. Salmen, S. A. Alharbi, S. Mutheeswaran, M. Anthonysamy, S. Ignacimuthu, A. Stalin
The biogenic synthesis of silver nanoparticles mediated by medicinal plant Sterculia foetida was the prime experimental analysis of present study. The most important aim and focus of this study was to synthesis the AgNPs via biological method and the same had been evaluated against bio-film formation and dose dependent cyto-toxicity against cancer cells. This in vitro comprehensive analysis show that Ag had more advantage than other metals, the NPs was mediated by plant residue. And the NPs were further characterized by UV showing the sharp absorption peak at 455 nm; the identification of corresponding functional section proved by the parameter like FTIR, where conversion of Ag ions and capping agent is determined, the analysis on X- ray diffraction demonstrate the AgNPs found to be crystalline nature and face-centered like cubic structure. FESEM cum EDAX has showed the surface morphology with 40-50nm. After the physiochemical characterization, the AgNPs were evaluated with biofilm formation and cancer cells. In cyto-toxic study, two cell lines such as MCF 7 lung cancer cell line and A549 Breast cancer cell line were experimented and the values are AgNPs (IC50 =11.50± 0.05 µg and IC50 = 5.5± 0.05 µg/mL); AgNO3- (IC50 = 5.8± 0.05 µg and IC50 = 6.5± 0.05µg/mL) and Sterculia foetida (IC50 > 5000 µg/mL and IC50 < 5000 µg/mL). Another application of this present study is anti-biofilm assay. The selected bacterial strains are methicillinresistant Staphylococcus aureus; PA 14-Pseudomonas aeruginosa and Vibrio cholerae. Hence, the findings recommend that silver nanoparticles from medicinal plant Sterculia foetida is effective and can be used against bacteria and more precisely for cancer cell study.
{"title":"Effect of biofilm formation and cytotoxicity of biogenic silver nanoparticles (AgNPs) synthesized from a medicinal plant Sterculia foetida L.","authors":"N. Vasanth, T. Dons, L. J. Michaelraj, P. Ganesan, S. H. Salmen, S. A. Alharbi, S. Mutheeswaran, M. Anthonysamy, S. Ignacimuthu, A. Stalin","doi":"10.15251/djnb.2023.184.1503","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1503","url":null,"abstract":"The biogenic synthesis of silver nanoparticles mediated by medicinal plant Sterculia foetida was the prime experimental analysis of present study. The most important aim and focus of this study was to synthesis the AgNPs via biological method and the same had been evaluated against bio-film formation and dose dependent cyto-toxicity against cancer cells. This in vitro comprehensive analysis show that Ag had more advantage than other metals, the NPs was mediated by plant residue. And the NPs were further characterized by UV showing the sharp absorption peak at 455 nm; the identification of corresponding functional section proved by the parameter like FTIR, where conversion of Ag ions and capping agent is determined, the analysis on X- ray diffraction demonstrate the AgNPs found to be crystalline nature and face-centered like cubic structure. FESEM cum EDAX has showed the surface morphology with 40-50nm. After the physiochemical characterization, the AgNPs were evaluated with biofilm formation and cancer cells. In cyto-toxic study, two cell lines such as MCF 7 lung cancer cell line and A549 Breast cancer cell line were experimented and the values are AgNPs (IC50 =11.50± 0.05 µg and IC50 = 5.5± 0.05 µg/mL); AgNO3- (IC50 = 5.8± 0.05 µg and IC50 = 6.5± 0.05µg/mL) and Sterculia foetida (IC50 > 5000 µg/mL and IC50 < 5000 µg/mL). Another application of this present study is anti-biofilm assay. The selected bacterial strains are methicillinresistant Staphylococcus aureus; PA 14-Pseudomonas aeruginosa and Vibrio cholerae. Hence, the findings recommend that silver nanoparticles from medicinal plant Sterculia foetida is effective and can be used against bacteria and more precisely for cancer cell study.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"60 13","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138605109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1451
D. Sudha, K. Uthayarani, N. Neelakandeswari, K. Jeyadheepan, M. Chitra
In the present work, MoO3 - MoO2 nanocomposite is synthesised via hydrothermal method and is characterised using various state-of-the-art techniques. The high crystallinity of the sample is observed from XRD and FESEM reveals the 2D plate like layered structures with hexagonal facets. The prepared composite is subjected to ethanol sensing at room temperature and it is observed that the material exhibits 4.5% for 25 ppm ethanol with response time as 98 s and recovery time as 219 s. The observed small response of the composite material MoO3 – MoO2 with longer response-recovery time might be due to the large sized fibrils observed.
{"title":"Synthesis, characterisation and ethanol sensing applications of MoO3 – MoO2 nanostructures at room temperature","authors":"D. Sudha, K. Uthayarani, N. Neelakandeswari, K. Jeyadheepan, M. Chitra","doi":"10.15251/djnb.2023.184.1451","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1451","url":null,"abstract":"In the present work, MoO3 - MoO2 nanocomposite is synthesised via hydrothermal method and is characterised using various state-of-the-art techniques. The high crystallinity of the sample is observed from XRD and FESEM reveals the 2D plate like layered structures with hexagonal facets. The prepared composite is subjected to ethanol sensing at room temperature and it is observed that the material exhibits 4.5% for 25 ppm ethanol with response time as 98 s and recovery time as 219 s. The observed small response of the composite material MoO3 – MoO2 with longer response-recovery time might be due to the large sized fibrils observed.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"80 19","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1351
P. Velarde, S. França, E. Brocchi, R. Souza
Dewatering unit operations are essential steps in mineral processing routes to obtain materials with high levels of solid content (60-70 wt.%). Polymers have been used for coagulation and flocculation in wastewater treatment for many years, and its application is mostly based on the ad- sorption mechanisms. In the case of fine nickel ore tailings, wastewaters typically contain large amounts of particles within microscale (d50 = 9.5 μm). The use of flocculant polymers, mostly poly- 18 acrylamides, acts to remove colloids from these effluents. Environmentally friendly natural poly- 19 mers, such as chitosan and humic acid, when used combined can be a highly effective reagent for 20 the treatment of these tailings. Therefore, the purpose of this study is to evaluate the use of these 21 natural polymers in the treatment of wastewater containing colloidal material to adequate the fine 22 particles content to less than 50 NTU, satisfying environmental standards. Particle removal effi- 23 ciency was calculated based on turbidity on wastewater as well as on thickener overflow. For fine 24 nickel tailings containing 2.15% (wt./vl.), a mixture of chitosan/humic acid of 24.9/6.3 g/t at pH=6.7 25 achieved a sedimentation of 95 wt.%. The turbidity was reduced to 40 NTU, motivating the use of 26 this technique to adequate wastewater to water reuse.
{"title":"Combined use of natural polymers (chitosan and humic acid) for treatment of Ni tailings containing fine particulate material","authors":"P. Velarde, S. França, E. Brocchi, R. Souza","doi":"10.15251/djnb.2023.184.1351","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1351","url":null,"abstract":"Dewatering unit operations are essential steps in mineral processing routes to obtain materials with high levels of solid content (60-70 wt.%). Polymers have been used for coagulation and flocculation in wastewater treatment for many years, and its application is mostly based on the ad- sorption mechanisms. In the case of fine nickel ore tailings, wastewaters typically contain large amounts of particles within microscale (d50 = 9.5 μm). The use of flocculant polymers, mostly poly- 18 acrylamides, acts to remove colloids from these effluents. Environmentally friendly natural poly- 19 mers, such as chitosan and humic acid, when used combined can be a highly effective reagent for 20 the treatment of these tailings. Therefore, the purpose of this study is to evaluate the use of these 21 natural polymers in the treatment of wastewater containing colloidal material to adequate the fine 22 particles content to less than 50 NTU, satisfying environmental standards. Particle removal effi- 23 ciency was calculated based on turbidity on wastewater as well as on thickener overflow. For fine 24 nickel tailings containing 2.15% (wt./vl.), a mixture of chitosan/humic acid of 24.9/6.3 g/t at pH=6.7 25 achieved a sedimentation of 95 wt.%. The turbidity was reduced to 40 NTU, motivating the use of 26 this technique to adequate wastewater to water reuse.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"77 13","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1363
S. Guluzade, N. Musayeva
The construction of a simple sensor structure sensitive to sulfur dioxide (SO2) based on multi-walled carbon nanotubes (MWCNTs) functionalized by nitric acid is described in this study. The functionalized MWCNTs were comparatively analyzed by X-ray diffraction, Raman, and FTIR spectroscopy methods, and their morphology was observed by scanning electron microscope (SEM). The sensitivity to 5 ppm SO2 gas is based on the change of resistance of functionalized MWCNTs. Tests on the fabricated sensor were performed at room temperature and defined that functionalized MWCNTs are sensitive to SO2 gas compared with the pristine MWCNTs.
{"title":"Room temperature detection of sulfur dioxide using functionalized carbon nanotubes","authors":"S. Guluzade, N. Musayeva","doi":"10.15251/djnb.2023.184.1363","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1363","url":null,"abstract":"The construction of a simple sensor structure sensitive to sulfur dioxide (SO2) based on multi-walled carbon nanotubes (MWCNTs) functionalized by nitric acid is described in this study. The functionalized MWCNTs were comparatively analyzed by X-ray diffraction, Raman, and FTIR spectroscopy methods, and their morphology was observed by scanning electron microscope (SEM). The sensitivity to 5 ppm SO2 gas is based on the change of resistance of functionalized MWCNTs. Tests on the fabricated sensor were performed at room temperature and defined that functionalized MWCNTs are sensitive to SO2 gas compared with the pristine MWCNTs.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":"20 10","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138601964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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