TiO2 doped with C, N and S (TCNS photocatalyst) was prepared by hydrolysis process using titanium iso-propoxide and thiourea. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron micro...TiO2 doped with C, N and S (TCNS photocatalyst) was prepared by hydrolysis process using titanium iso-propoxide and thiourea. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photo electron spectroscopy (XPS), BET surface area, FTIR and diffuse reflectance spectra (DRS). The results showed that the prepared catalysts are anatase type and nanosized par-ticles. The catalysts exhibited stronger absorption in the visible light region with a red shift in the adsorption edge. The photocatalytic activity of TCNS photocatalysts was evaluated by the photocatalytic degradation of isoproturon pesticide in aqueous solution. In the present study the maximum activity was achieved for TCNS5 catalyst at neutral pH with 1 g L-1 catalyst amount and at 1.14 x 10-4 M concentration of the pesticide solution. The TCNS photocatalysts showed higher phtocatalytic activity under solar light irradiation. This is attributed to the synergetic effects of red shift in the absorption edge, higher surface area and the inhibition of charge carrier recombination process.展开更多
A series of titania nanoparticles and nanotubes deposited with various quantities of bismuth（Bi） were prepared via sol-gel and hydrothermal methods, respectively. They were then characterized using X-ray diffraction...A series of titania nanoparticles and nanotubes deposited with various quantities of bismuth（Bi） were prepared via sol-gel and hydrothermal methods, respectively. They were then characterized using X-ray diffraction spectroscopy（XRD）, X-ray photo electron spectroscopy（XPS）, UV–Vis diffused reflectance spectra（DRS）, photoluminescence spectra（PLS）, transmission electron microscopy（TEM）, energy dispersive analysis of X-rays（EDAX）, and BET surface analysis. These catalysts were employed for the photocatalytic production of hydrogen from a mixture of pure water and glycerol under solar light irradiation. The presence of the Bispecies was found to play a vital role in enhancing activity while minimizing electron hole recombination（relative to bare TiO）. The nanotubes exhibited better activity than the nanoparticles of Bi-deposited TiO, showing the significance of the morphology; however, photocatalytic activity is predominantly dependent on the deposition of bismuth. The activity increased by approximately an order of magnitude at the optimum concentration of Bi deposited over TiO（2 wt%）. The presence of the Bispecies played a vital role in minimizing electron hole recombination, resulting in higher activity compared to bare TiO.展开更多
文摘TiO2 doped with C, N and S (TCNS photocatalyst) was prepared by hydrolysis process using titanium iso-propoxide and thiourea. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photo electron spectroscopy (XPS), BET surface area, FTIR and diffuse reflectance spectra (DRS). The results showed that the prepared catalysts are anatase type and nanosized par-ticles. The catalysts exhibited stronger absorption in the visible light region with a red shift in the adsorption edge. The photocatalytic activity of TCNS photocatalysts was evaluated by the photocatalytic degradation of isoproturon pesticide in aqueous solution. In the present study the maximum activity was achieved for TCNS5 catalyst at neutral pH with 1 g L-1 catalyst amount and at 1.14 x 10-4 M concentration of the pesticide solution. The TCNS photocatalysts showed higher phtocatalytic activity under solar light irradiation. This is attributed to the synergetic effects of red shift in the absorption edge, higher surface area and the inhibition of charge carrier recombination process.
基金support from a National Research Foundation of Korea(NRF)grant funded by the Ministry of Science,ICT&Future Planning(No.2016R1E1A1A01940995)
文摘A series of titania nanoparticles and nanotubes deposited with various quantities of bismuth（Bi） were prepared via sol-gel and hydrothermal methods, respectively. They were then characterized using X-ray diffraction spectroscopy（XRD）, X-ray photo electron spectroscopy（XPS）, UV–Vis diffused reflectance spectra（DRS）, photoluminescence spectra（PLS）, transmission electron microscopy（TEM）, energy dispersive analysis of X-rays（EDAX）, and BET surface analysis. These catalysts were employed for the photocatalytic production of hydrogen from a mixture of pure water and glycerol under solar light irradiation. The presence of the Bispecies was found to play a vital role in enhancing activity while minimizing electron hole recombination（relative to bare TiO）. The nanotubes exhibited better activity than the nanoparticles of Bi-deposited TiO, showing the significance of the morphology; however, photocatalytic activity is predominantly dependent on the deposition of bismuth. The activity increased by approximately an order of magnitude at the optimum concentration of Bi deposited over TiO（2 wt%）. The presence of the Bispecies played a vital role in minimizing electron hole recombination, resulting in higher activity compared to bare TiO.
