Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc456
L. Rumiyanti, Catur Destiana, Ria Oktaviani, Syafriadi, R. Marjunus, Chotimah, E. Suharyadi
We design silica from rice husk as a precursor for mesoporous silica nanoparticles (MSN), which is eco-friendly, low-cost, and abundant in availability, replacing tetraethyl orthosilicate, which is expensive and its vapours cause blindness, by the facile method, i.e., sol-gel. The different pore sizes of MSN have been successfully reached by tuning the synthesis conditions of surfactant concentrations and hydrothermal treatment temperatures. The smallest pore size of MSN is 2.62 nm, with the most significant surface area of 19.169 m2/g. The higher surfactant concentrations affect the decrease of particle size of MSN, but the higher hydrothermal treatment temperatures affect the opposite. In addition, these factors affect the morphology, the graph of isotherm, and the atomic elements of MSN. Thus, the resulting MSN will be applied to nanocontainers of corrosion inhibitor because of getting the small pore size.
{"title":"Facile pore size control and low-cost synthesis of mesoporous silica nanoparticles based on rice husk","authors":"L. Rumiyanti, Catur Destiana, Ria Oktaviani, Syafriadi, R. Marjunus, Chotimah, E. Suharyadi","doi":"10.1088/2043-6262/acc456","DOIUrl":"https://doi.org/10.1088/2043-6262/acc456","url":null,"abstract":"We design silica from rice husk as a precursor for mesoporous silica nanoparticles (MSN), which is eco-friendly, low-cost, and abundant in availability, replacing tetraethyl orthosilicate, which is expensive and its vapours cause blindness, by the facile method, i.e., sol-gel. The different pore sizes of MSN have been successfully reached by tuning the synthesis conditions of surfactant concentrations and hydrothermal treatment temperatures. The smallest pore size of MSN is 2.62 nm, with the most significant surface area of 19.169 m2/g. The higher surfactant concentrations affect the decrease of particle size of MSN, but the higher hydrothermal treatment temperatures affect the opposite. In addition, these factors affect the morphology, the graph of isotherm, and the atomic elements of MSN. Thus, the resulting MSN will be applied to nanocontainers of corrosion inhibitor because of getting the small pore size.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44922553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc01d
Bapan Bairy, Piu Das, Kartik Tantubay, Moni Baskey (Sen)
Synthetic dyes emerging from wastewater effluents result in a hazardous environment to our society, hence removal of these dye molecules from the water bodies is necessary due to their toxic nature for living beings. In our study, a straightforward one pot synthetic process is conducted to synthesize reduced graphene oxide (RGO) using Averrhoa carambola fruit extract. To confirm the formation of RGO, different characterization techniques such as Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy and X-Ray Diffraction (XRD) are investigated. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) are used to understand the morphology of RGO. Adsorption kinetics for pseudo-first order and pseudo-second order has been carried out for both dyes. Freundlich and Langmuir adsorption isotherm models were confirmed to describe each of the adsorption ability responses with high correlation coefficients. Maximum adsorption capacities of methylene blue (MB) and crystal violet (CV) on RGO were 52.308 mg g−1 and 31.466 mg g−1 respectively. The adsorption ability of this adsorbent is monitored by recyclability in five subsequent cycles and it is observed that up to 5 cycles, there is no significant decrease in adsorption capability. The present study showed that RGO is highly efficient in removing MB and CV dyes from environmental water bodies. The thermodynamics study for the adsorption phenomena of MB and CV dyes on RGO sheet has been investigated.
{"title":"Adsorption kinetics, isotherm and thermodynamics studies for the removal of cationic dyes from environmental wastewater by reduced graphene oxide adsorbent synthesized via greener way","authors":"Bapan Bairy, Piu Das, Kartik Tantubay, Moni Baskey (Sen)","doi":"10.1088/2043-6262/acc01d","DOIUrl":"https://doi.org/10.1088/2043-6262/acc01d","url":null,"abstract":"Synthetic dyes emerging from wastewater effluents result in a hazardous environment to our society, hence removal of these dye molecules from the water bodies is necessary due to their toxic nature for living beings. In our study, a straightforward one pot synthetic process is conducted to synthesize reduced graphene oxide (RGO) using Averrhoa carambola fruit extract. To confirm the formation of RGO, different characterization techniques such as Fourier transform infrared spectroscopy (FTIR), UV–Vis spectroscopy and X-Ray Diffraction (XRD) are investigated. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) are used to understand the morphology of RGO. Adsorption kinetics for pseudo-first order and pseudo-second order has been carried out for both dyes. Freundlich and Langmuir adsorption isotherm models were confirmed to describe each of the adsorption ability responses with high correlation coefficients. Maximum adsorption capacities of methylene blue (MB) and crystal violet (CV) on RGO were 52.308 mg g−1 and 31.466 mg g−1 respectively. The adsorption ability of this adsorbent is monitored by recyclability in five subsequent cycles and it is observed that up to 5 cycles, there is no significant decrease in adsorption capability. The present study showed that RGO is highly efficient in removing MB and CV dyes from environmental water bodies. The thermodynamics study for the adsorption phenomena of MB and CV dyes on RGO sheet has been investigated.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44326540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc455
D. Komaraiah, R. Sayanna
The semiconductor metal oxide CuO films have been fabricated using spin coating techniques. The prepared CuO thin films were annealed at different temperatures and characterized by an x-ray diffractometer, scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), FTIR, UV–vis, and fluorescence spectrometer. X-Ray diffraction (XRD) patterns revealed the polycrystalline nature of CuO with the monoclinic crystal structure. SEM analysis of CuO films endorsed the particle-like spherical shape structure. The CuO thin films have shown high optical absorption with a narrow bandgap. The band gap values were evaluated from Tauc’s plots and these values were found to be in the range of 1.63 to 1.72 eV. At an excitation of 325 nm, the CuO films display characteristic photoluminescence (PL) emission in the UV and visible regions. Furthermore, the CuO thin films show enhanced photocatalytic performance towards the degradation of organic dyes under visible light.
{"title":"Structural, optical properties and photocatalytic activity of spin-coated CuO thin films","authors":"D. Komaraiah, R. Sayanna","doi":"10.1088/2043-6262/acc455","DOIUrl":"https://doi.org/10.1088/2043-6262/acc455","url":null,"abstract":"The semiconductor metal oxide CuO films have been fabricated using spin coating techniques. The prepared CuO thin films were annealed at different temperatures and characterized by an x-ray diffractometer, scanning electron microscope (SEM), energy-dispersive x-ray spectroscopy (EDS), FTIR, UV–vis, and fluorescence spectrometer. X-Ray diffraction (XRD) patterns revealed the polycrystalline nature of CuO with the monoclinic crystal structure. SEM analysis of CuO films endorsed the particle-like spherical shape structure. The CuO thin films have shown high optical absorption with a narrow bandgap. The band gap values were evaluated from Tauc’s plots and these values were found to be in the range of 1.63 to 1.72 eV. At an excitation of 325 nm, the CuO films display characteristic photoluminescence (PL) emission in the UV and visible regions. Furthermore, the CuO thin films show enhanced photocatalytic performance towards the degradation of organic dyes under visible light.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45852360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc459
N. N. Le, Duc Trinh-Minh Dinh, Phuong Hong Lam, Anh Van Thi Le, M. Le, Minh Duc Pham, Dung My Thi Dang, C. M. Dang
Microfluidic paper-based channels play an important role in microfluidic paper-based analytical devices (μPADs). There are some fabrication methods which could be utilised to fabricate microfluidic channels on paper substrate. Among these methods, inkjet printing process is considered as a promising fabrication method with many advantages such as low-cost, material saving, high precision, etc. The aim of this work is to apply inkjet printing technology to fabricate paper channels of μPADs. A new design of μPAD was proposed in this paper to demonstrate how to fabricate inkjet-printed hydrophobic lines to make paper-based biosensor. Biological target of our μPADs is human chOrionic gonadotropin (hCG). Colorimetric signals from μPADs were captured by digital camera and measured by ImageJ software, which showed that these μPADs can determine hCG in the range from 1,000 to 10,000 ng ml−1. These results showed that piezoelectric inkjet printing technology can fabricate 250 μm-width hydrophobic lines on paper substrate, helping in fabricating μPADs in next applications.
{"title":"Fabrication of microfluidic paper-based channels by inkjet printing process for analytical applications","authors":"N. N. Le, Duc Trinh-Minh Dinh, Phuong Hong Lam, Anh Van Thi Le, M. Le, Minh Duc Pham, Dung My Thi Dang, C. M. Dang","doi":"10.1088/2043-6262/acc459","DOIUrl":"https://doi.org/10.1088/2043-6262/acc459","url":null,"abstract":"Microfluidic paper-based channels play an important role in microfluidic paper-based analytical devices (μPADs). There are some fabrication methods which could be utilised to fabricate microfluidic channels on paper substrate. Among these methods, inkjet printing process is considered as a promising fabrication method with many advantages such as low-cost, material saving, high precision, etc. The aim of this work is to apply inkjet printing technology to fabricate paper channels of μPADs. A new design of μPAD was proposed in this paper to demonstrate how to fabricate inkjet-printed hydrophobic lines to make paper-based biosensor. Biological target of our μPADs is human chOrionic gonadotropin (hCG). Colorimetric signals from μPADs were captured by digital camera and measured by ImageJ software, which showed that these μPADs can determine hCG in the range from 1,000 to 10,000 ng ml−1. These results showed that piezoelectric inkjet printing technology can fabricate 250 μm-width hydrophobic lines on paper substrate, helping in fabricating μPADs in next applications.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45283470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc453
S. Karami, M. Shamsipur, A. Barati, Reza Fartootzadeh, F. Molaabasi, M. Alipour, H. Radi
Carbon dots (CDs) as a new type of fluorescent nanomaterials have attracted considerable attention from researchers in chemistry, biology, and materials science. Here, we employed a hydrothermal method for synthesis of red-emitting and antibacterial CDs displaying an excitation-independent emission characteristic with a maximum emission intensity at 610 nm (pH 7.4). The synthesised CDs exhibited a high capability for bioimaging in HeLa cells, because of their negligible cytotoxicity and acceptable red photoluminescence. Moreover, the antibacterial activity of CDs against P. aeruginosa was studied and showed a minimum inhibitory concentration (MIC) of 256 μg ml−1. Further experimental results showed the high ability of the CDs to heal skin wounds in the rat model. According to the observations, wound healing in the presence of the CDs was calculated four days faster with 20.48% better performance than the control group.
{"title":"Red-emitting and antibacterial carbon dots for cellular imaging and skin wound healing","authors":"S. Karami, M. Shamsipur, A. Barati, Reza Fartootzadeh, F. Molaabasi, M. Alipour, H. Radi","doi":"10.1088/2043-6262/acc453","DOIUrl":"https://doi.org/10.1088/2043-6262/acc453","url":null,"abstract":"Carbon dots (CDs) as a new type of fluorescent nanomaterials have attracted considerable attention from researchers in chemistry, biology, and materials science. Here, we employed a hydrothermal method for synthesis of red-emitting and antibacterial CDs displaying an excitation-independent emission characteristic with a maximum emission intensity at 610 nm (pH 7.4). The synthesised CDs exhibited a high capability for bioimaging in HeLa cells, because of their negligible cytotoxicity and acceptable red photoluminescence. Moreover, the antibacterial activity of CDs against P. aeruginosa was studied and showed a minimum inhibitory concentration (MIC) of 256 μg ml−1. Further experimental results showed the high ability of the CDs to heal skin wounds in the rat model. According to the observations, wound healing in the presence of the CDs was calculated four days faster with 20.48% better performance than the control group.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48155310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc01c
R. Anitha Reddy, A. Venkateswara Rao, B. Rajesh Babu, K. R. Rama Rao, V. Raghavendra
In this work structural, magnetic and antimicrobial studies of gadolinium (Gd) doped cobalt ferrite nanopowder samples were synthesised through facile auto-combustion route using citric acid as combustion agent. The pristine nanopowders were sintered at 600 °C. X-ray diffraction (XRD), infrared spectroscopy (IR) measurements indicated the formation of a single spinel phase. The lattice constant gradually increased from 8.3801 Å to 8.3915 Å with increasing Gd concentration. The average crystallite size varied from 54 nm to 42.7 nm. The correlation between the cation distribution from XRD and the magnetic properties is discussed. The substitution of Gd ions significantly reduced the magnetisation from 60.6 to 36.6 emu g−1 and increased the coercivity. Antimicrobial activities of pure and Gd substituted cobalt ferrite are carried out against Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) and also against fungi strain (Aspergillus niger) pathogens, suggesting that Gd substitution significantly improves the activity of cobalt ferrite nanopowders.
{"title":"Structural, magnetic and antibacterial studies of gadolinium doped cobalt ferrite nanoparticles synthesized at low temperature","authors":"R. Anitha Reddy, A. Venkateswara Rao, B. Rajesh Babu, K. R. Rama Rao, V. Raghavendra","doi":"10.1088/2043-6262/acc01c","DOIUrl":"https://doi.org/10.1088/2043-6262/acc01c","url":null,"abstract":"In this work structural, magnetic and antimicrobial studies of gadolinium (Gd) doped cobalt ferrite nanopowder samples were synthesised through facile auto-combustion route using citric acid as combustion agent. The pristine nanopowders were sintered at 600 °C. X-ray diffraction (XRD), infrared spectroscopy (IR) measurements indicated the formation of a single spinel phase. The lattice constant gradually increased from 8.3801 Å to 8.3915 Å with increasing Gd concentration. The average crystallite size varied from 54 nm to 42.7 nm. The correlation between the cation distribution from XRD and the magnetic properties is discussed. The substitution of Gd ions significantly reduced the magnetisation from 60.6 to 36.6 emu g−1 and increased the coercivity. Antimicrobial activities of pure and Gd substituted cobalt ferrite are carried out against Gram-positive (Bacillus subtilis) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) and also against fungi strain (Aspergillus niger) pathogens, suggesting that Gd substitution significantly improves the activity of cobalt ferrite nanopowders.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46853784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc734
T. T. Nguyen, Nhu Quynh Nguyen, Duong Thai, Tu Doanh Tieu, V. Tran, M. Le
In this study, graphene nanoribbons (GNBs) were utilized as a conductive agent for the olivine structure-based cathode LiFePO4 to facilitate the fast redox reaction and enable a high-rate battery performance. As a result, the cathodes comprising 5 wt% graphene nanoribbons and 10 wt% conductive carbon nanoparticles exhibited the maximum capacity, 163.25 mAh.g−1 at 0.1C and 130.60 mAh.g−1 at 2C with excellent capacity retention after 100 cycles. In addition, graphene nanoribbons demonstrate positive impacts on the charge transfer process. Still, the high concentration of GNBs in the cathode weakens the adhesion properties and will need further optimization in the slurry mixing process.
{"title":"Enabling stable and high-rate of an olivine-type cathode LiFePO4 for Li-ion batteries by using graphene nanoribbons as conductive agent","authors":"T. T. Nguyen, Nhu Quynh Nguyen, Duong Thai, Tu Doanh Tieu, V. Tran, M. Le","doi":"10.1088/2043-6262/acc734","DOIUrl":"https://doi.org/10.1088/2043-6262/acc734","url":null,"abstract":"In this study, graphene nanoribbons (GNBs) were utilized as a conductive agent for the olivine structure-based cathode LiFePO4 to facilitate the fast redox reaction and enable a high-rate battery performance. As a result, the cathodes comprising 5 wt% graphene nanoribbons and 10 wt% conductive carbon nanoparticles exhibited the maximum capacity, 163.25 mAh.g−1 at 0.1C and 130.60 mAh.g−1 at 2C with excellent capacity retention after 100 cycles. In addition, graphene nanoribbons demonstrate positive impacts on the charge transfer process. Still, the high concentration of GNBs in the cathode weakens the adhesion properties and will need further optimization in the slurry mixing process.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41761414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc735
Geovany A. Souza, D. Cordeiro, Tatiana D M Ernter
A fluorescent system formed by the combination of coumarin derivative and self-assembled peptide nanostructures was used as sensing system to determine dissolved oxygen (O2) in water samples. Detection was based on the sensing system fluorescence quenching by O2, measured by steady-state and time-resolved fluorescence spectroscopy and Stern-Volmer plot to correlate fluorescence intensity to O2 concentration in the samples. Also, fluorescence lifetime decays informed about the mechanisms in which the quenching is occurring, indicating that the sensing system is highly sensitive and selective to O2, since quenching occurs by a non-radiative energy transfer from electronic excited singlet states of the system to the O2 molecule. This process was evidenced by the system fluorescence lifetime decrease, yielding Singlet O2 as indicative that this system can also find other technological applications.
{"title":"Steady-state and fluorescence lifetime quenching of self-assembled diphenylalanine/coumarin nanostructures as a method to determine dissolved O2 in water","authors":"Geovany A. Souza, D. Cordeiro, Tatiana D M Ernter","doi":"10.1088/2043-6262/acc735","DOIUrl":"https://doi.org/10.1088/2043-6262/acc735","url":null,"abstract":"A fluorescent system formed by the combination of coumarin derivative and self-assembled peptide nanostructures was used as sensing system to determine dissolved oxygen (O2) in water samples. Detection was based on the sensing system fluorescence quenching by O2, measured by steady-state and time-resolved fluorescence spectroscopy and Stern-Volmer plot to correlate fluorescence intensity to O2 concentration in the samples. Also, fluorescence lifetime decays informed about the mechanisms in which the quenching is occurring, indicating that the sensing system is highly sensitive and selective to O2, since quenching occurs by a non-radiative energy transfer from electronic excited singlet states of the system to the O2 molecule. This process was evidenced by the system fluorescence lifetime decrease, yielding Singlet O2 as indicative that this system can also find other technological applications.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46155223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc732
M. Chand, Swapnil Barthwal, A. Rawat, M. Khanuja, S. Rawat
Semiconductor mediated photocatalysis has emerged as a promising solution for dye degradation and environmental remediation. Zinc Indium Sulfide (ZnIn2S4, ZIS) is a benign, eco-friendly, visible-light-responsive photocatalyst, exhibiting excellent optoelectronic properties. In this work, we present a scalable, low temperature and template-free chemical aqueous solution method for the synthesis of ZIS. The obtained powder sample was used for a comparative dye degradation study of cationic (Malachite green) and anionic (Congo red) dye. The higher photocatalytic efficiency of ZIS is due to the higher BET surface area (55.042 m2 g−1) and low band gap (2.3 eV). Under Sunlight, almost 80 percent degradation occurs within 20 min of the experiment for both Malachite green (MG) and anionic Congo red (CR) dye, outperforming previously reported results. Scavenger studies were used to figure out the radicals involved in photocatalytic mechanics and to come up with viable photocatalytic degradation routes. The reusability and stability of ZIS were carried out up to the 5th cycles. Our result revealed that ZIS possesses high stability, reusability, and efficient potential to be an effective dye degradation photocatalyst.
{"title":"A comparative photocatalytic degradation study of cationic and anionic dyes using ZnIn2S4 photocatalyst","authors":"M. Chand, Swapnil Barthwal, A. Rawat, M. Khanuja, S. Rawat","doi":"10.1088/2043-6262/acc732","DOIUrl":"https://doi.org/10.1088/2043-6262/acc732","url":null,"abstract":"Semiconductor mediated photocatalysis has emerged as a promising solution for dye degradation and environmental remediation. Zinc Indium Sulfide (ZnIn2S4, ZIS) is a benign, eco-friendly, visible-light-responsive photocatalyst, exhibiting excellent optoelectronic properties. In this work, we present a scalable, low temperature and template-free chemical aqueous solution method for the synthesis of ZIS. The obtained powder sample was used for a comparative dye degradation study of cationic (Malachite green) and anionic (Congo red) dye. The higher photocatalytic efficiency of ZIS is due to the higher BET surface area (55.042 m2 g−1) and low band gap (2.3 eV). Under Sunlight, almost 80 percent degradation occurs within 20 min of the experiment for both Malachite green (MG) and anionic Congo red (CR) dye, outperforming previously reported results. Scavenger studies were used to figure out the radicals involved in photocatalytic mechanics and to come up with viable photocatalytic degradation routes. The reusability and stability of ZIS were carried out up to the 5th cycles. Our result revealed that ZIS possesses high stability, reusability, and efficient potential to be an effective dye degradation photocatalyst.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47236268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1088/2043-6262/acc454
M. Joshi, Sukumar Roy, V. Venugopal
In this study, electrospun polyurethane nanofibre composite incorporated with drug loaded halloysite nanotubes is presented. Chlorhexidine acetate (CA) drug was loaded into the halloysite nanotubes (HNT) to facilitate its controlled release for prolonged efficacy. The drug loading percentage in HNT was determined using thermo-gravimetric (TG) analysis. Uniform fibrous webs were obtained by electrospinning technique with optimised process parameters (i.e., 10 KV, flow rate of 5 μl min−1 and needle to collector distance of 10 cm) which was evident from SEM images. Antimicrobial efficiency of the nanowebs was determined using disk diffusion method (AATCC 90) against both the Gram-positive (S. aureus) and Gram-negative (E. coli) bacteria. The polyurethane/HNT-CA nanowebs showed very good activity against these strains. The drug release analysis of the nanowebs was carried by UV–vis spectrophotometry using total immersion method. The nanocomposite with drug loaded in HNT showed higher controlled release characteristics as evident from the drug release assay.
{"title":"Polyurethane/ drug loaded halloysite nanotubes based electrospun nanocomposite for sustained drug release","authors":"M. Joshi, Sukumar Roy, V. Venugopal","doi":"10.1088/2043-6262/acc454","DOIUrl":"https://doi.org/10.1088/2043-6262/acc454","url":null,"abstract":"In this study, electrospun polyurethane nanofibre composite incorporated with drug loaded halloysite nanotubes is presented. Chlorhexidine acetate (CA) drug was loaded into the halloysite nanotubes (HNT) to facilitate its controlled release for prolonged efficacy. The drug loading percentage in HNT was determined using thermo-gravimetric (TG) analysis. Uniform fibrous webs were obtained by electrospinning technique with optimised process parameters (i.e., 10 KV, flow rate of 5 μl min−1 and needle to collector distance of 10 cm) which was evident from SEM images. Antimicrobial efficiency of the nanowebs was determined using disk diffusion method (AATCC 90) against both the Gram-positive (S. aureus) and Gram-negative (E. coli) bacteria. The polyurethane/HNT-CA nanowebs showed very good activity against these strains. The drug release analysis of the nanowebs was carried by UV–vis spectrophotometry using total immersion method. The nanocomposite with drug loaded in HNT showed higher controlled release characteristics as evident from the drug release assay.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.1,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46059428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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