期刊
CHINESE JOURNAL OF CATALYSIS
卷 43, 期 2, 页码 461-471出版社
ELSEVIER
DOI: 10.1016/S1872-2067(21)63915-3
关键词
Mesoporous TiO2; Electrostatic self-assembly; Ti3C2 MXene; Co-catalyst; Photocatalytic degradation; Photocatalytic hydrogen production
资金
- National Natural Science Foundation of China [51972180, 51572134]
- Natural Science Foundation of Shandong Province [ZR2019BB030]
- Key Research AMP
- Development Project of Shandong Province [2019GGX102070]
- Program for Scientific Research Innovation Team in Colleges and Universities of Jinan [2018GXRC006]
This study presents a mesoporous TiO2/Ti3C2 composite based on MXene nanoparticles, which exhibits significantly enhanced light absorption performance and photo-induced carriers separation and transfer ability, thus boosting the photocatalytic activity. The optimized composite shows excellent efficiency in methyl orange degradation and H-2 production.
Photocatalytic degradation and hydrogen production using solar energy through semiconductor photocatalysts are deemed to be a powerful approach for solving environmental and energy crisis. However, the biggest challenge in photocatalysis is the efficient separation of photo-induced carriers. To this end, we report that the mesoporous TiO2 nanoparticles are anchored on highly conductive Ti3C2 MXene co-catalyst by electrostatic self-assembly strategy. The constructed mesoporous TiO2/Ti3C2 composites display that the mesoporous TiO2 nanoparticles are uniformly distributed on the surface of layer structured Ti3C2 nanosheets. More importantly, the as-obtained mesoporous TiO2/Ti3C2 composites reveal the significantly enhanced light absorption performance, photo-induced carriers separation and transfer ability, thus boosting the photocatalytic activity. The photocatalytic methyl orange degradation efficiency of mesoporous TiO2/Ti3C2 composite with an optimized Ti3C2 content (3 wt%) can reach 99.6% within 40 min. The capture experiments of active species confirm that the center dot O-2 and center dot OH play major role in photocatalytic degradation process. Furthermore, the optimized mesoporous TiO2/Ti3C2 composite also shows an excellent photocatalytic H-2 production rate of 218.85 mu mol g(-1) h(-1), resulting in a 5.6 times activity as compared with the pristine mesoporous TiO2 nanoparticles. This study demonstrates that the MXene family materials can be applied as highly efficient noble-metal-free co-catalysts in the field of photocatalysis. (C) 2022, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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