Volume 40 Issue 1
Jan.  2023
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YU Guanlong, WANG Shitao, YANG Kai, et al. Preparation of BiOI/BiOBr0.9I0.1 photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid[J]. Acta Materiae Compositae Sinica, 2023, 40(1): 201-211. doi: 10.13801/j.cnki.fhclxb.20220216.001
Citation: YU Guanlong, WANG Shitao, YANG Kai, et al. Preparation of BiOI/BiOBr0.9I0.1 photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid[J]. Acta Materiae Compositae Sinica, 2023, 40(1): 201-211. doi: 10.13801/j.cnki.fhclxb.20220216.001

Preparation of BiOI/BiOBr0.9I0.1 photocatalyst and its degradation performance on 2,4-dichlorophenoxyacetic acid

doi: 10.13801/j.cnki.fhclxb.20220216.001
Funds:  Changsha University of Science and Technology Professional degree "Practical Innovation and Entrepreneurship Ability Training Program" Project (SJCX202038); Hunan Provincial Natural Science Foundation of China (2021JJ30728); Scientific Research Projects of Ecology and Environment Department of Hunan (HBKT- 2021012); Scientific Research Found of Hunan Provincial Education Department (19A032)
  • Received Date: 2021-12-09
  • Accepted Date: 2022-01-22
  • Rev Recd Date: 2022-01-14
  • Available Online: 2022-02-17
  • Publish Date: 2023-01-15
  • The pollution of pesticides seriously threatens the ecological environment and drinking water safety. A novel and efficient photocatalyst of BiOI/BiOBr0.9I0.1 was prepared through solvothermal method. The physicochemical properties, such as structure, morphology and optical properties, were characterized by detections of XRD, SEM, XPS, UV-vis DRS, PL, EIS, etc. The BiOI/BiOBr0.9I0.1 synthesized has a cluster-like accumulation structure, which facilitates the increase of active sites. The combination of solid solution and heterojunction broadens the photoresponse range of BiOBr, effectively prevents the recombination of photogenerated electron-hole pairs inside BiOI/BiOBr0.9I0.1 and improves the redox ability of photogenerated carriers. The results of photocatalytic experiments show that 15wt%BiOI/BiOBr0.9I0.1 reaches the best photocatalytic performance for 2,4-dichlorophenoxyacetic acid (2,4-D) under visible light, and the degradation efficiency of 2,4-D can reach 95% within 120 min. Furthermore, the degradation rate still reaches 80.9% after four cycles of experiments. According to the results of capture experiments and electron spin-resonance (ESR) tests, it can be confirmed that •O2 and h+ are the main active species. The BiOBr0.9I0.1 synthesized can effectively modulate the energy band structure of BiOBr. The heterojunction composed of BiOBr0.9I0.1 and BiOI is consistent with the characteristics of Z-scheme heterojunction, and the synergistic effect between the two strategies of constructing heterojunction and solid solution can be produced in enhancing the photocatalytic activity of BiOBr.

     

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