Search

Your search keyword '"Dai, Yong-Ming"' showing total 215 results
Start Over Author "Dai, Yong-Ming"
215 results on '"Dai, Yong-Ming"'

25. Photocatalytic CO2 Reduction to CH4 and Dye Degradation Using Bismuth Oxychloride/Bismuth Oxyiodide/Graphitic Carbon Nitride (BiOmCln/BiOpIq/g-C3N4) Nanocomposite with Enhanced Visible-Light Photocatalytic Activity

Author

Dai, Yong-Ming, primary, Wu, Wu-Tsan, additional, Lin, Yu-Yun, additional, Wu, Hsiao-Li, additional, Chen, Szu-Han, additional, Jehng, Jih-Mirn, additional, Lin, Jia-Hao, additional, Liu, Fu-Yu, additional, and Chen, Chiing-Chang, additional

Published
2023
Full Text
View/download PDF

33. The ZnO–Au-Titanium oxide nanotubes (TiNTs) composites photocatalysts for CO2 reduction application

Author

Jhin-Ling Liou, Jih-Mirn Jehng, Cheng-Tso Cheng, Dai Yong-Ming, and Yu-Sheng Lai

Subjects
Materials science, Scanning electron microscope, Process Chemistry and Technology, Oxide, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, Catalysis, Titanium oxide, chemistry.chemical_compound, chemistry, law, Transmission electron microscopy, Titanium dioxide, Materials Chemistry, Ceramics and Composites, Photocatalysis, Calcination, Composite material
Abstract

The presence of gold nanoparticles (Au) on the zinc oxide (Zn)-titanium oxide nanotubus (TiNTs) composites to form the Z-scheme type photocatalysts has been investigated for photocatalytic reduction of CO2 to methanol. In this study, the commercial titanium dioxide powder (P-25) was first treated under a strong basic environment and applied a hydrotherrmal method to systhsize TiNTs, and calcined to use as a support. Then, various ratios of ZnO and TiNTs from 0.1 to 0.5 were also prepared by hydrothermal method to form TiNTs-ZnO-X (TZ-X, X is equal to the ZnO/TiNTs weight ratio) composites, and 1 to 5 wt % of Au were impregnated on the TiNTs-ZnO support to form the ZnO–Au-TiNTs composite photocatalysts. The catalysts will be characterized by x-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–visible spectroscopy (UV–Vis) and photoluminescence spectroscopy (PL) techniques to determine the structures and morphology of the ZnO–Au-TiNTs composites. The catalytic results have revealed that the TZ-0.20–2 wt% Au catalyst has the best photocatalysis activity with a 7777.1μmole/(g-cat) (hr) CH3OH production yield. The formation of the ZnO–Au-TiNTs Z-scheme type heterostructure results in an efficient electron transfer pathway and electron-hole separation inside the composite catalyst which lead to a highly efficient CO2 reduction and excellent improvement in methanol yield.

Published
2021

46. Photocatalytic CO 2 Reduction to CH 4 and Dye Degradation Using Bismuth Oxychloride/Bismuth Oxyiodide/Graphitic Carbon Nitride (BiO m Cl n /BiO p I q /g-C 3 N 4) Nanocomposite with Enhanced Visible-Light Photocatalytic Activity.

Author

Dai, Yong-Ming, Wu, Wu-Tsan, Lin, Yu-Yun, Wu, Hsiao-Li, Chen, Szu-Han, Jehng, Jih-Mirn, Lin, Jia-Hao, Liu, Fu-Yu, and Chen, Chiing-Chang

Subjects
*PHOTOCATALYSTS, *BISMUTH, *NITRIDES, *CARBON dioxide, *ELECTRON paramagnetic resonance, *GENTIAN violet, *ELECTRON-hole recombination
Abstract

The use of visible-light-driven photocatalysts in wastewater treatment, photoreduction of CO2, green solar fuels, and solar cells has elicited substantial research attention. Bismuth oxyhalide and its derivatives are a group of visible-light photocatalysts that can diminish electron–hole recombination in layered structures and boost photocatalytic activity. The energy bandgap of these photocatalysts lies in the range of visible light. A simple hydrothermal method was applied to fabricate a series of bismuth oxychloride/bismuth oxyiodide/grafted graphitic carbon nitride (BiOmCln/BiOpIq/g-C3N4) sheets with different contents of g-C3N4. The fabricated sheets were characterized through XRD, TEM, SEM-EDS, XPS, UV-vis DRS, PL, and BET. The conversion efficiency of CO2 reduction to CH4 of BiOmCln/BiOpIq of 4.09 μmol g−1 can be increased to 39.43 μmol g−1 by compositing with g-C3N4. It had an approximately 9.64 times improvement. The photodegradation rate constant for crystal violet (CV) dye of BiOmCln/BiOpIq of k = 0.0684 can be increased to 0.2456 by compositing with g-C3N4. It had an approximately 3.6 times improvement. The electron paramagnetic resonance results and the quenching effects indicated that 1O2, •OH, h+, and •O2− were active species in the aforementioned photocatalytic degradation. Because of their heterojunction, the prepared ternary nanocomposites possessed the characteristics of a heterojunction of type II band alignment. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results