Pub Date : 2024-01-01DOI: 10.15251/djnb.2024.191.15
R. Jothiramalingam, T. Radhika, N. P. Kavitha, H. Al-Lohedan, D.M. Aldhayan, M. Karnan
In the present study, Ti3C2Tx type MXene was prepared by selective etching of Al from Ti3AlC2 with mesh size of 200. The powder form of raw material was used to fabricate Ti3C2Tx by in-situ HF etching method. The MXene is further coated on non-woven paper by simply dip coating method. The detailed structural, morphology and elemental content study of as prepared Ti3C2Tx MXene have demonstrated. The MXene (Ti3AlC2) powders show compact, layered morphology as expected for bulk layered ternary carbide. The detailed elemental analysis has carried out for Titanium carbide based MXene coated and uncoated woven paper. The lower conducting property obtained for paper coating due less amount of coating in the surface of paper instead of coating on glass substrate. The electrical property characterization of MXene coated non-woven paper and glass substrate have also been studied. Hence, the conductive coating of MXene-in water formulation achieved through simple dip coating methods is promising for low cost sensor, wearable shielding device fabrication towards renewable energy and healthcare applications.
{"title":"Synthesis, morphology and electrical property characteristics of MXene based titanium carbide (Ti3C2Tx) coating on non-woven cotton paper","authors":"R. Jothiramalingam, T. Radhika, N. P. Kavitha, H. Al-Lohedan, D.M. Aldhayan, M. Karnan","doi":"10.15251/djnb.2024.191.15","DOIUrl":"https://doi.org/10.15251/djnb.2024.191.15","url":null,"abstract":"In the present study, Ti3C2Tx type MXene was prepared by selective etching of Al from Ti3AlC2 with mesh size of 200. The powder form of raw material was used to fabricate Ti3C2Tx by in-situ HF etching method. The MXene is further coated on non-woven paper by simply dip coating method. The detailed structural, morphology and elemental content study of as prepared Ti3C2Tx MXene have demonstrated. The MXene (Ti3AlC2) powders show compact, layered morphology as expected for bulk layered ternary carbide. The detailed elemental analysis has carried out for Titanium carbide based MXene coated and uncoated woven paper. The lower conducting property obtained for paper coating due less amount of coating in the surface of paper instead of coating on glass substrate. The electrical property characterization of MXene coated non-woven paper and glass substrate have also been studied. Hence, the conductive coating of MXene-in water formulation achieved through simple dip coating methods is promising for low cost sensor, wearable shielding device fabrication towards renewable energy and healthcare applications.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140518532","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 : 2024-01-01DOI: 10.15251/djnb.2024.191.41
W. M. W. Mohammad, E. A. G. E. Ali, M. A. A. Abdullah, C. K. Sheng
Graphene nanoplatelets (GNP) are just one of the attractive graphene-based nanomaterials that are rapidly emerging and have sparked the interest of many industries. These small stacks of platelet-shaped graphene sheets have a unique size and morphology that quickly disperse into other materials such as polymers, resulting in higher-value composite materials with improved thermal, conductivity, and mechanical capabilities. A detailed analysis of reinforced High-Density Polyethylene (HDPE) using different sizes (2, 15, 25 µm) and compositions (8, 10, 15 wt.%) of Graphene Nanoplatelets (GNP) has been conducted. The microstructure of the HDPE/GNP nanocomposites was extensively examined during the melt blending and injection moulding processes. Based on the results, the nanocomposites with different sizes of GNP exhibited dissimilar behaviour with different compositions. Furthermore, scanning electron microscope (SEM) results indicated a homogeneous dispersion for GNP in melt mixing. Moreover, thermogravimetric (TG) data demonstrate that increasing filler showed a slight increase in the material's thermal stability. The use of GNP improved mechanical properties, as evidenced by the increases in Young's modulus of yield strength from around 100 MPa to over 400 MPa. This study provides a practical reference for the industrial preparation of polymer-based graphene nanocomposites.
{"title":"Investigation on mechanical, electrical and morphological of high-density polyethylene (HDPE) reinforced with different particle size and composition of graphene nanoplatelets (GNP)","authors":"W. M. W. Mohammad, E. A. G. E. Ali, M. A. A. Abdullah, C. K. Sheng","doi":"10.15251/djnb.2024.191.41","DOIUrl":"https://doi.org/10.15251/djnb.2024.191.41","url":null,"abstract":"Graphene nanoplatelets (GNP) are just one of the attractive graphene-based nanomaterials that are rapidly emerging and have sparked the interest of many industries. These small stacks of platelet-shaped graphene sheets have a unique size and morphology that quickly disperse into other materials such as polymers, resulting in higher-value composite materials with improved thermal, conductivity, and mechanical capabilities. A detailed analysis of reinforced High-Density Polyethylene (HDPE) using different sizes (2, 15, 25 µm) and compositions (8, 10, 15 wt.%) of Graphene Nanoplatelets (GNP) has been conducted. The microstructure of the HDPE/GNP nanocomposites was extensively examined during the melt blending and injection moulding processes. Based on the results, the nanocomposites with different sizes of GNP exhibited dissimilar behaviour with different compositions. Furthermore, scanning electron microscope (SEM) results indicated a homogeneous dispersion for GNP in melt mixing. Moreover, thermogravimetric (TG) data demonstrate that increasing filler showed a slight increase in the material's thermal stability. The use of GNP improved mechanical properties, as evidenced by the increases in Young's modulus of yield strength from around 100 MPa to over 400 MPa. This study provides a practical reference for the industrial preparation of polymer-based graphene nanocomposites.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140523987","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 : 2024-01-01DOI: 10.15251/djnb.2024.191.97
S. K. Jubear, O. Abdulmunem, E. S. Hassan
On a glass substrate, zinc oxide nanorods (ZnO NRs) arrays of varying aspect ratios have been grown by hydrothermal method at 90 ᴼC with variable ZnO seed layer thicknesses applied by RF sputtering. The structural properties and gas sensitivity of zinc oxide nanorods were studied by using X-ray diffraction (XRD) for analyzing the structural characteristics was discovered that ZnO NRs and seed layer films are both polycrystalline, with the same plane preferred reflection for (002). The seed layer's crystallite size ranges from 19.51 nm to 30.45 nm for thicknesses t1 and t4, respectively. The measurements of the FESEM showed aspect ratios for ZnO NRs ranging from 3.03 for t1 to 4.9 for t4, with growth in different shapes: ZnO NRs for t1, flowers and rod-like shapes for thicknesses t2 and t3, and hexagonal-rod-like shapes for t4. ZnO NRs based on gas sensors and tests of the response of prepared samples on NH3 and CO2 gases showed good sensitivity to both gases at different concentrations (1000, 2000, and 3000 ppm), reaching 65–70 at operating 50 ᴼC.
{"title":"Hydrothermally grown ZnO nanorods in different aspect ratios and their gas sensing properties","authors":"S. K. Jubear, O. Abdulmunem, E. S. Hassan","doi":"10.15251/djnb.2024.191.97","DOIUrl":"https://doi.org/10.15251/djnb.2024.191.97","url":null,"abstract":"On a glass substrate, zinc oxide nanorods (ZnO NRs) arrays of varying aspect ratios have been grown by hydrothermal method at 90 ᴼC with variable ZnO seed layer thicknesses applied by RF sputtering. The structural properties and gas sensitivity of zinc oxide nanorods were studied by using X-ray diffraction (XRD) for analyzing the structural characteristics was discovered that ZnO NRs and seed layer films are both polycrystalline, with the same plane preferred reflection for (002). The seed layer's crystallite size ranges from 19.51 nm to 30.45 nm for thicknesses t1 and t4, respectively. The measurements of the FESEM showed aspect ratios for ZnO NRs ranging from 3.03 for t1 to 4.9 for t4, with growth in different shapes: ZnO NRs for t1, flowers and rod-like shapes for thicknesses t2 and t3, and hexagonal-rod-like shapes for t4. ZnO NRs based on gas sensors and tests of the response of prepared samples on NH3 and CO2 gases showed good sensitivity to both gases at different concentrations (1000, 2000, and 3000 ppm), reaching 65–70 at operating 50 ᴼC.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139632090","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.2023.184.1461
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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}
Pub Date : 2023-12-04DOI: 10.15251/djnb.2023.184.1395
H. Li, Z. P. Hou, X. H. Zhang
The MoO3/GO composites were synthesized via a hydrothermal method. The performance of these composites as lubricating oil additives was investigated by a multifunctional friction testing machine. And the lubrication mechanism of MoO3/GO in base oil was discussed based on SEM and EDS test data. The results demonstrate that MoO3/GO composites as additives exhibit excellent anti-friction and anti-wear properties. This is mainly due to the synergistic effect between the lubricating film formed by the composite material on the wear surface and the self-healing ability of nano-MoO3, which can effectively fill and repair wear scars while reducing friction and wear on the steel disc surface.
{"title":"Preparation and tribological properties of GO supported MoO3 composite nanomaterials","authors":"H. Li, Z. P. Hou, X. H. Zhang","doi":"10.15251/djnb.2023.184.1395","DOIUrl":"https://doi.org/10.15251/djnb.2023.184.1395","url":null,"abstract":"The MoO3/GO composites were synthesized via a hydrothermal method. The performance of these composites as lubricating oil additives was investigated by a multifunctional friction testing machine. And the lubrication mechanism of MoO3/GO in base oil was discussed based on SEM and EDS test data. The results demonstrate that MoO3/GO composites as additives exhibit excellent anti-friction and anti-wear properties. This is mainly due to the synergistic effect between the lubricating film formed by the composite material on the wear surface and the self-healing ability of nano-MoO3, which can effectively fill and repair wear scars while reducing friction and wear on the steel disc surface.","PeriodicalId":11233,"journal":{"name":"Digest Journal of Nanomaterials and Biostructures","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138604058","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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