Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (2): 461-471.DOI: 10.1016/S1872-2067(21)63915-3

• Article • Previous Articles     Next Articles

Ti3C2 MXene co-catalyst assembled with mesoporous TiO2 for boosting photocatalytic activity of methyl orange degradation and hydrogen production

Huapeng Li, Bin Sun*(), Tingting Gao, Huan Li, Yongqiang Ren, Guowei Zhou#()   

  1. Key Laboratory of Fine Chemicals in Universities of Shandong, Jinan Engineering Laboratory for Multi-scale Functional Materials, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, Shandong, China
  • Received:2021-05-01 Accepted:2021-05-01 Online:2022-02-18 Published:2022-02-18
  • Contact: Bin Sun, Guowei Zhou
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(51972180);This work was supported by the National Natural Science Foundation of China(51572134);Natural Science Foundation of Shandong Province(ZR2019BB030);Key Research & Development Project of Shandong Province(2019GGX102070);the Program for Scientific Research Innovation Team in Colleges and Universities of Jinan(2018GXRC006)

Abstract:

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 ·O2 - and ·OH play major role in photocatalytic degradation process. Furthermore, the optimized mesoporous TiO2/Ti3C2 composite also shows an excellent photocatalytic H2 production rate of 218.85 μmol 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.

Key words: Mesoporous TiO2, Electrostatic self-assembly, Ti3C2 MXene, Co-catalyst, Photocatalytic degradation, Photocatalytic hydrogen production