Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (8): 1212-1221.DOI: 10.1016/S1872-2067(19)63359-0

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Novel SiO2 nanoparticle-decorated BiOCl nanosheets exhibiting high photocatalytic performances for the removal of organic pollutants

Changlin Yua, Hongbo Heb,c, Xingqiang Liud, Julan Zenge, Zhen Liua   

  1. a School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, Guangdong University of Petrochemical Technology, Maoming 525000, Guangdong, China;
    b School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China;
    c School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, Guangdong, China;
    d School of Environmental Science and Engineering, Key Laboratory of Estuarine Ecological Security and Environmental Health, Xiamen University Tan Kah Kee College, Zhangzhou 363105, Fujian, China;
    e School of Chemisry and Food Engineering, Changsha University of Science and Technology, Changsha 410114, China
  • Received:2019-01-23 Revised:2019-03-20 Online:2019-08-18 Published:2019-06-21
  • Supported by:
    We acknowledged the funding from the National Natural Science Foundation of China (21567008, 21707055), the Program for Innovative Research Team of Guangdong University of Petrochemical Technology, the Yangfan talents Project of Guangdong Province, the Innovation-driven "5511" Program in Jiangxi Province (20165BCB18014), the Funding Program for Academic and Technological Leaders of Major Disciplines in Jiangxi Province (20172BCB22018), the Program for New Century Excellent Talents in Fujian Province University, and the Natural Science Foundation for Distinguished Young Scholars of Hunan Province, China (2017JJ1026).

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Abstract: Novel SiO2/BiOCl composites were fabricated by decorating BiOCl nanosheets with SiO2 nanoparticles via a simple hydrothermal process. The as-prepared pure BiOCl and SiO2/BiOCl composites were intensively characterized by various techniques such as XRD, FT-IR, SEM/TEM, BET, UV-vis, DRS, XPS, and photocurrent measurements. The SiO2/BiOCl composite nanosheets displayed high photocatalytic activity and excellent stability in the degradation of organic pollutants such as phenol, bisphenol A (BPA), and rhodamine B (RhB). With respect to those over bare BiOCl, the degradation rates of RhB, BPA, and phenol over 1.88% SiO2/BiOCl increased 16.5%, 29.0%, and 38.7%, respectively. Radical capturing results suggested that h+ is the major reactive species and that hydroxyl (·OH) and superoxide (·O2-) radicals could also be involved in the degradation of organic pollutants. The enhanced photocatalytic performances of SiO2/BiOCl composites can be mainly attributed to the improved texture and the formation of intimate SiO2/BiOCl interfaces, which largely promoted the adsorption of organic pollutants, enhanced the light harvesting, and accelerated the separation of e- and h+.

Key words: SiO2/BiOCl, Nanosheets, Organic pollutant, Photocatalysis, Interface