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Assumpta C Nwanya - One of the best experts on this subject based on the ideXlab platform.

  • industrial Textile Effluent treatment and antibacterial effectiveness of zea mays l dry husk mediated bio synthesized copper oxide nanoparticles
    Journal of Hazardous Materials, 2019
    Co-Authors: Assumpta C Nwanya, L C Razanamahandry, A K H Bashir, Chinwe O Ikpo, S C Nwanya, S Botha
    Abstract:

    Abstract Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu2O nanoparticles were obtained for the first time via this simple, eco- friendly, green synthesis route. The Cu2O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36–73 nm and 30−90 nm for the unannealed Cu2O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and Textile Effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu2O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.

  • industrial Textile Effluent treatment and antibacterial effectiveness of zea mays l dry husk mediated bio synthesized copper oxide nanoparticles
    Journal of Hazardous Materials, 2019
    Co-Authors: Assumpta C Nwanya, L C Razanamahandry, A K H Bashir, Chinwe O Ikpo, S C Nwanya, S Botha
    Abstract:

    Abstract Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu2O nanoparticles were obtained for the first time via this simple, eco- friendly, green synthesis route. The Cu2O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36–73 nm and 30−90 nm for the unannealed Cu2O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and Textile Effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu2O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.

A. Stephen - One of the best experts on this subject based on the ideXlab platform.

  • Visible light degradation of Textile Effluent by electrodeposited multiphase CuInSe2 semiconductor photocatalysts
    Journal of Molecular Liquids, 2017
    Co-Authors: N. Karthikeyan, T. Sivaranjani, S. Dhanavel, Vinod Kumar Gupta, V. Narayanan, A. Stephen
    Abstract:

    Abstract Reduction in recombination of photogenerated electron-hole pairs and effective migration of the generated pairs across the surface of the photocatalyst to the aqueous solution of Textile Effluent can increase the photocatalytic efficiency of a semiconductor. In this study multiphase CuInSe2 (CIS) semiconductor with modified band gap was synthesized through pulsed electrodeposition (PED). Prepared photocatalysts were characterized by XRD, AFM, FESEM, TEM and UV–Vis DRS. The samples exhibited multiphase nature with prominently observed tetragonal and cubic crystallographic structures, having two different modified band gap energy. The photocatalytic degradation efficiency was investigated for the model dyes like methylene blue (MB), Rhodamine B (RhB) dye and the Textile Effluent under visible light irradiation. Successful degradation of the dyes and Textile Effluent were attributed to formation of heterojunction of the two phases with two different band gaps, with their energy band edges at the right positions, facilitating efficient migration of the photogenerated charge carriers across the surfaces, before their recombination. It motivates the initiation of chain of redox reactions and degrading reactions with the production of highly reactive hydroxyl radicals which attacked the dyes and the Textile Effluent. The photocatalytic degradation mechanism was proposed for the electrodeposited photocatalyst.

  • zno cdo nanocomposites for Textile Effluent degradation and electrochemical detection
    Journal of Molecular Liquids, 2015
    Co-Authors: R. Saravanan, Vinod Kumar Gupta, V. Narayanan, Francisco Gracia, Mohammad Mansoob Khan, V. Poornima, A. Stephen
    Abstract:

    Abstract In this report, the photocatalytic and electrochemical activity of ZnO and ZnO/CdO nanocomposites were determined. Pure ZnO and nanocomposite ZnO/CdO were prepared by a vapor to solid mechanism and were characterized by different physical and chemical techniques. The CdO-modified ZnO possessed high efficiency to degrade Textile Effluent. It also showed high efficiency of degradation, such as 98% for methylene blue and 93% for methyl orange. Cadmium oxide (impurity) plays an important role in achieving zinc oxide materials that exhibit UV to visible light degradation of Textile Effluent. Additionally, uric acid sensing performed to study the electrochemical activity revealed that ZnO/CdO (90:10) nanocomposite produced high anodic currents, and these results were in agreement with the cyclic voltammetry reports.

  • zno ag mn2o3 nanocomposite for visible light induced industrial Textile Effluent degradation uric acid and ascorbic acid sensing and antimicrobial activity
    RSC Advances, 2015
    Co-Authors: R. Saravanan, Vinod Kumar Gupta, V. Narayanan, Mohammad Mansoob Khan, Edgar Mosquera, F Gracia, A. Stephen
    Abstract:

    A facile and inexpensive route has been developed to synthesize a ternary ZnO/Ag/Mn2O3 nanocomposite having nanorod structures based on the thermal decomposition method. The as-synthesized ternary ZnO/Ag/Mn2O3 nanocomposite was characterized and used for visible light-induced photocatalytic, sensing and antimicrobial studies. The ternary ZnO/Ag/Mn2O3 nanocomposite exhibited excellent and enhanced visible light-induced photocatalytic degradation of industrial Textile Effluent (real sample analysis) compared to pure ZnO. Sensing studies showed that the ternary ZnO/Ag/Mn2O3 nanocomposite exhibited outstanding and improved detection of uric acid (UA) and ascorbic acid (AA). It also showed effective and efficient bactericidal activities against Staphylococcus aureus and Escherichia coli. These results suggest that the small size, high surface area and synergistic effect among ZnO, AgNPs and Mn2O3 induced visible light photocatalytic activity by decreasing the recombination of photogenerated electrons and holes, and extending the response of pure ZnO to visible light, enhanced sensing of UA and AA and antimicrobial activity. Overall, the ternary ZnO/Ag/Mn2O3 nanocomposite is a valuable material that can be used for a range of applications, such as visible light-induced photocatalysis, sensing and antimicrobial activity. Therefore, ternary nanocomposites could have important applications in environmental science, sensing, and biological fields.

  • zno ag mn2o3 nanocomposite for visible light induced industrial Textile Effluent degradation uric acid and ascorbic acid sensing and antimicrobial activity
    RSC Advances, 2015
    Co-Authors: R. Saravanan, Vinod Kumar Gupta, V. Narayanan, Mohammad Mansoob Khan, Edgar Mosquera, F Gracia, A. Stephen
    Abstract:

    A facile and inexpensive route has been developed to synthesize a ternary ZnO/Ag/Mn2O3 nanocomposite having nanorod structures based on the thermal decomposition method. The as-synthesized ternary ZnO/Ag/Mn2O3 nanocomposite was characterized and used for visible light-induced photocatalytic, sensing and antimicrobial studies. The ternary ZnO/Ag/Mn2O3 nanocomposite exhibited excellent and enhanced visible light-induced photocatalytic degradation of industrial Textile Effluent (real sample analysis) compared to pure ZnO. Sensing studies showed that the ternary ZnO/Ag/Mn2O3 nanocomposite exhibited outstanding and improved detection of uric acid (UA) and ascorbic acid (AA). It also showed effective and efficient bactericidal activities against Staphylococcus aureus and Escherichia coli. These results suggest that the small size, high surface area and synergistic effect among ZnO, AgNPs and Mn2O3 induced visible light photocatalytic activity by decreasing the recombination of photogenerated electrons and holes, and extending the response of pure ZnO to visible light, enhanced sensing of UA and AA and antimicrobial activity. Overall, the ternary ZnO/Ag/Mn2O3 nanocomposite is a valuable material that can be used for a range of applications, such as visible light-induced photocatalysis, sensing and antimicrobial activity. Therefore, ternary nanocomposites could have important applications in environmental science, sensing, and biological fields.

  • visible light degradation of Textile Effluent using novel catalyst zno γ mn2o3
    Journal of The Taiwan Institute of Chemical Engineers, 2014
    Co-Authors: R. Saravanan, V. Narayanan, V K Gupta, A. Stephen
    Abstract:

    Abstract The novel ZnO/γ-Mn 2 O 3 (various weight percentages) nanocomposite catalysts were prepared by thermal decomposition method and their size, shape, and surface area were characterized by various techniques. Further, the prepared samples were used to degrade methylene blue (MB) and methyl orange (MO) in aqueous medium under visible light irradiation. Finally, the best catalyst was employed to degrade phenol and a Textile Effluent. The recycling ability and their efficiency of catalyst are discussed in detail.

Vinod Kumar Gupta - One of the best experts on this subject based on the ideXlab platform.

  • Visible light degradation of Textile Effluent by electrodeposited multiphase CuInSe2 semiconductor photocatalysts
    Journal of Molecular Liquids, 2017
    Co-Authors: N. Karthikeyan, T. Sivaranjani, S. Dhanavel, Vinod Kumar Gupta, V. Narayanan, A. Stephen
    Abstract:

    Abstract Reduction in recombination of photogenerated electron-hole pairs and effective migration of the generated pairs across the surface of the photocatalyst to the aqueous solution of Textile Effluent can increase the photocatalytic efficiency of a semiconductor. In this study multiphase CuInSe2 (CIS) semiconductor with modified band gap was synthesized through pulsed electrodeposition (PED). Prepared photocatalysts were characterized by XRD, AFM, FESEM, TEM and UV–Vis DRS. The samples exhibited multiphase nature with prominently observed tetragonal and cubic crystallographic structures, having two different modified band gap energy. The photocatalytic degradation efficiency was investigated for the model dyes like methylene blue (MB), Rhodamine B (RhB) dye and the Textile Effluent under visible light irradiation. Successful degradation of the dyes and Textile Effluent were attributed to formation of heterojunction of the two phases with two different band gaps, with their energy band edges at the right positions, facilitating efficient migration of the photogenerated charge carriers across the surfaces, before their recombination. It motivates the initiation of chain of redox reactions and degrading reactions with the production of highly reactive hydroxyl radicals which attacked the dyes and the Textile Effluent. The photocatalytic degradation mechanism was proposed for the electrodeposited photocatalyst.

  • zno cdo nanocomposites for Textile Effluent degradation and electrochemical detection
    Journal of Molecular Liquids, 2015
    Co-Authors: R. Saravanan, Vinod Kumar Gupta, V. Narayanan, Francisco Gracia, Mohammad Mansoob Khan, V. Poornima, A. Stephen
    Abstract:

    Abstract In this report, the photocatalytic and electrochemical activity of ZnO and ZnO/CdO nanocomposites were determined. Pure ZnO and nanocomposite ZnO/CdO were prepared by a vapor to solid mechanism and were characterized by different physical and chemical techniques. The CdO-modified ZnO possessed high efficiency to degrade Textile Effluent. It also showed high efficiency of degradation, such as 98% for methylene blue and 93% for methyl orange. Cadmium oxide (impurity) plays an important role in achieving zinc oxide materials that exhibit UV to visible light degradation of Textile Effluent. Additionally, uric acid sensing performed to study the electrochemical activity revealed that ZnO/CdO (90:10) nanocomposite produced high anodic currents, and these results were in agreement with the cyclic voltammetry reports.

  • zno ag mn2o3 nanocomposite for visible light induced industrial Textile Effluent degradation uric acid and ascorbic acid sensing and antimicrobial activity
    RSC Advances, 2015
    Co-Authors: R. Saravanan, Vinod Kumar Gupta, V. Narayanan, Mohammad Mansoob Khan, Edgar Mosquera, F Gracia, A. Stephen
    Abstract:

    A facile and inexpensive route has been developed to synthesize a ternary ZnO/Ag/Mn2O3 nanocomposite having nanorod structures based on the thermal decomposition method. The as-synthesized ternary ZnO/Ag/Mn2O3 nanocomposite was characterized and used for visible light-induced photocatalytic, sensing and antimicrobial studies. The ternary ZnO/Ag/Mn2O3 nanocomposite exhibited excellent and enhanced visible light-induced photocatalytic degradation of industrial Textile Effluent (real sample analysis) compared to pure ZnO. Sensing studies showed that the ternary ZnO/Ag/Mn2O3 nanocomposite exhibited outstanding and improved detection of uric acid (UA) and ascorbic acid (AA). It also showed effective and efficient bactericidal activities against Staphylococcus aureus and Escherichia coli. These results suggest that the small size, high surface area and synergistic effect among ZnO, AgNPs and Mn2O3 induced visible light photocatalytic activity by decreasing the recombination of photogenerated electrons and holes, and extending the response of pure ZnO to visible light, enhanced sensing of UA and AA and antimicrobial activity. Overall, the ternary ZnO/Ag/Mn2O3 nanocomposite is a valuable material that can be used for a range of applications, such as visible light-induced photocatalysis, sensing and antimicrobial activity. Therefore, ternary nanocomposites could have important applications in environmental science, sensing, and biological fields.

  • zno ag mn2o3 nanocomposite for visible light induced industrial Textile Effluent degradation uric acid and ascorbic acid sensing and antimicrobial activity
    RSC Advances, 2015
    Co-Authors: R. Saravanan, Vinod Kumar Gupta, V. Narayanan, Mohammad Mansoob Khan, Edgar Mosquera, F Gracia, A. Stephen
    Abstract:

    A facile and inexpensive route has been developed to synthesize a ternary ZnO/Ag/Mn2O3 nanocomposite having nanorod structures based on the thermal decomposition method. The as-synthesized ternary ZnO/Ag/Mn2O3 nanocomposite was characterized and used for visible light-induced photocatalytic, sensing and antimicrobial studies. The ternary ZnO/Ag/Mn2O3 nanocomposite exhibited excellent and enhanced visible light-induced photocatalytic degradation of industrial Textile Effluent (real sample analysis) compared to pure ZnO. Sensing studies showed that the ternary ZnO/Ag/Mn2O3 nanocomposite exhibited outstanding and improved detection of uric acid (UA) and ascorbic acid (AA). It also showed effective and efficient bactericidal activities against Staphylococcus aureus and Escherichia coli. These results suggest that the small size, high surface area and synergistic effect among ZnO, AgNPs and Mn2O3 induced visible light photocatalytic activity by decreasing the recombination of photogenerated electrons and holes, and extending the response of pure ZnO to visible light, enhanced sensing of UA and AA and antimicrobial activity. Overall, the ternary ZnO/Ag/Mn2O3 nanocomposite is a valuable material that can be used for a range of applications, such as visible light-induced photocatalysis, sensing and antimicrobial activity. Therefore, ternary nanocomposites could have important applications in environmental science, sensing, and biological fields.

S Botha - One of the best experts on this subject based on the ideXlab platform.

  • industrial Textile Effluent treatment and antibacterial effectiveness of zea mays l dry husk mediated bio synthesized copper oxide nanoparticles
    Journal of Hazardous Materials, 2019
    Co-Authors: Assumpta C Nwanya, L C Razanamahandry, A K H Bashir, Chinwe O Ikpo, S C Nwanya, S Botha
    Abstract:

    Abstract Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu2O nanoparticles were obtained for the first time via this simple, eco- friendly, green synthesis route. The Cu2O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36–73 nm and 30−90 nm for the unannealed Cu2O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and Textile Effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu2O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.

  • industrial Textile Effluent treatment and antibacterial effectiveness of zea mays l dry husk mediated bio synthesized copper oxide nanoparticles
    Journal of Hazardous Materials, 2019
    Co-Authors: Assumpta C Nwanya, L C Razanamahandry, A K H Bashir, Chinwe O Ikpo, S C Nwanya, S Botha
    Abstract:

    Abstract Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu2O nanoparticles were obtained for the first time via this simple, eco- friendly, green synthesis route. The Cu2O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36–73 nm and 30−90 nm for the unannealed Cu2O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and Textile Effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu2O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.

A K H Bashir - One of the best experts on this subject based on the ideXlab platform.

  • industrial Textile Effluent treatment and antibacterial effectiveness of zea mays l dry husk mediated bio synthesized copper oxide nanoparticles
    Journal of Hazardous Materials, 2019
    Co-Authors: Assumpta C Nwanya, L C Razanamahandry, A K H Bashir, Chinwe O Ikpo, S C Nwanya, S Botha
    Abstract:

    Abstract Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu2O nanoparticles were obtained for the first time via this simple, eco- friendly, green synthesis route. The Cu2O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36–73 nm and 30−90 nm for the unannealed Cu2O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and Textile Effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu2O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.

  • industrial Textile Effluent treatment and antibacterial effectiveness of zea mays l dry husk mediated bio synthesized copper oxide nanoparticles
    Journal of Hazardous Materials, 2019
    Co-Authors: Assumpta C Nwanya, L C Razanamahandry, A K H Bashir, Chinwe O Ikpo, S C Nwanya, S Botha
    Abstract:

    Abstract Zea mays L. dry husk extract was used to bio synthesize copper oxide nanoparticles. Red coloured cubic Cu2O nanoparticles were obtained for the first time via this simple, eco- friendly, green synthesis route. The Cu2O nanoparticles were thermally oxidized to pure monoclinic CuO nanoparticles at 600 °C. The phases of the copper oxides were confirmed from the x-ray diffraction (XRD) studies. The nanoparticle sizes as obtained from high resolution transmission electron microscope (HRTEM) analysis range from 10 to 26 nm, 36–73 nm and 30−90 nm for the unannealed Cu2O, 300 °C and 600 °C annealed CuO respectively. The values of the bandgap energies obtained from diffuse reflectance of the nanoparticles are 2.0, 1.30 and 1.42 eV respectively for the unannealed, 300 °C, and 600 °C annealed copper oxide nanoparticles. The 600 °C annealed copper oxide nanoparticles showed 91% and 90% degradation ability for methylene blue dye (BM) and Textile Effluent (TE) respectively under visible light irradiation. While CuO_300 is more effective to inhibit the growth of Escherichia coli 518,133 and Staphylococcus aureus 9144, Cu2O is better for Pseudomonas aeruginosa and Bacillus licheniformis. The results confirm the photo-catalytic and anti-microbial effectiveness of the copper oxide nanoparticles.