TY - JOUR
T1 - Preparation of Al-O-Linked Porous-g-C3N4/TiO2-Nanotube Z-Scheme Composites for Efficient Photocatalytic CO2 Conversion and 2,4-Dichlorophenol Decomposition and Mechanism
AU - Wu, Jing
AU - Feng, Yujie
AU - Logan, B. E.
AU - Dai, Changchao
AU - Han, Xiaoyu
AU - Li, Da
AU - Liu, Jia
N1 - Funding Information:
This work was supported by the National Key R&D Program of China (grant no. 2016YFE0106500), National Natural Science Fund of China (grant nos. 21673061 and 51408156), and the National Key R&D Program of China (grant no. 2016YFC0401101). The authors also acknowledge the project funded by China Postdoctoral Science Foundation (grant no. 2017M621265) and the Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (no. QA201935).
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/9/16
Y1 - 2019/9/16
N2 - The photocatalytic activity of TiO2 nanotubes can be improved through the construction of a Z-scheme composite, where photogenerated electrons from TiO2 recombine with the photogenerated holes in a coupled semiconductor. This arrangement allows for improved oxidation due to the residual holes of TiO2 and better chemical reduction due to the greater availability of the photogenerated electrons of the coupled semiconductor. Efficient Z-scheme porous-g-C3N4/TiO2-nanotube (PCN/TNTs) composites were developed here using a solid sublimation and transition approach, with Al-O links added by an impregnation method to increase interfacial linkages between the PCN and TNTs. The best results for photocatalytic CO2 conversion were obtained using 0.7PCN/0.4Al/TNTs, as shown by production of 54.9 ± 0.70 mg L-1 h-1 of acetic acid, 42.7 ± 0.54 mg L-1 h-1 of formic acid, and 45.4 ± 0.55 mg L-1 h-1 of methanol, which were about 3.8, 4.3, and 4.2 times that produced with bare TNTs. Photocatalytic 2,4-dichlorophenol decomposition with 0.7PCN/0.4Al/TNTs showed a 40% enhancement compared to bare TNTs in 1.5 h. This Z-scheme composite photocatalyst therefore provides an improved method for more efficient CO2 conversion or pollutant degradation based on the improved charge separation and linkage of the PCN/TNTs using Al-O.
AB - The photocatalytic activity of TiO2 nanotubes can be improved through the construction of a Z-scheme composite, where photogenerated electrons from TiO2 recombine with the photogenerated holes in a coupled semiconductor. This arrangement allows for improved oxidation due to the residual holes of TiO2 and better chemical reduction due to the greater availability of the photogenerated electrons of the coupled semiconductor. Efficient Z-scheme porous-g-C3N4/TiO2-nanotube (PCN/TNTs) composites were developed here using a solid sublimation and transition approach, with Al-O links added by an impregnation method to increase interfacial linkages between the PCN and TNTs. The best results for photocatalytic CO2 conversion were obtained using 0.7PCN/0.4Al/TNTs, as shown by production of 54.9 ± 0.70 mg L-1 h-1 of acetic acid, 42.7 ± 0.54 mg L-1 h-1 of formic acid, and 45.4 ± 0.55 mg L-1 h-1 of methanol, which were about 3.8, 4.3, and 4.2 times that produced with bare TNTs. Photocatalytic 2,4-dichlorophenol decomposition with 0.7PCN/0.4Al/TNTs showed a 40% enhancement compared to bare TNTs in 1.5 h. This Z-scheme composite photocatalyst therefore provides an improved method for more efficient CO2 conversion or pollutant degradation based on the improved charge separation and linkage of the PCN/TNTs using Al-O.
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U2 - 10.1021/acssuschemeng.9b02489
DO - 10.1021/acssuschemeng.9b02489
M3 - Article
AN - SCOPUS:85072713086
SN - 2168-0485
VL - 7
SP - 15289
EP - 15296
JO - ACS Sustainable Chemistry and Engineering
JF - ACS Sustainable Chemistry and Engineering
IS - 18
ER -