One-step synthesis of floatable BiOCl/BiOBr@FACs enriched in oxygen vacancies for improved photocatalytic activity via peroxymonosulfate activation

被引:9
作者
Lin, Li [1 ]
Xie, Du [1 ]
Xu, Lin [1 ]
Huang, Yi [1 ]
Qing, Xiangdong [1 ]
Huang, Manhong [2 ,3 ]
Kazemian, Hossein [4 ,5 ]
机构
[1] Hunan City Univ, Sch Mat & Chem Engn, Yiyang 413000, Peoples R China
[2] Donghua Univ, Key Lab Pollut Control & Emiss Reduct Technol Text, Shanghai 201620, Peoples R China
[3] Donghua Univ, Coll Mat Sci & Engn, Innovat Ctr Text Sci & Technol, State Key Lab Modificat Chem Fibers & Polymer Mat, 2999 North Renmin Rd, Shanghai 201620, Peoples R China
[4] Univ Northern British Columbia, Northern Analyt Lab Serv Northern BCs Environm & C, Prince George, BC, Canada
[5] Univ Northern British Columbia, Fac Sci & Engn, Chem Dept, Prince George, BC, Canada
关键词
Fly ash cenospheres; BiOCl/BiOBr; Photocatalytic; Peroxymonosulfate; Tetracycline; FLY-ASH; DEGRADATION; HETEROSTRUCTURE; MICROSPHERES; FABRICATION; GENERATION; OXIDATION; WATER;
D O I
10.1016/j.colsurfa.2023.132165
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, we developed a highly active floatable photocatalyst by incorporating BiOCl/BiOBr heterojunctions with abundant oxygen vacancies (OVs) onto fly ash cenospheres (FACs) composites, aiming to enhance the efficiency of tetracycline (TC) removal. The physicochemical properties of resulting composites were analyzed using various characterization techniques. The findings demonstrated the uniform anchoring of nanosheet-arraylike BiOCl, BiOBr, or BiOCl/BiOBr heterojunctions on the surface of FACs. Intriguingly, the BiOCl/BiOBr heterojunctions exhibited an increased content of OVs compared to BiOCl and BiOBr alone. The degradation experiments of TC revealed that the BiOCl/BiOBr@FACs composites displayed optimal photodegradability, which was further enhanced by the assistance of peroxymonosulfate (PMS). Furthermore, through active species capture experiments and ESR analysis, we proposed a synergistic reactive mechanism that differed from single photocatalytic processes and traditional PMS activation. Active species such as h+, 1O2, & BULL;O2- , & BULL;OH and & BULL;SO4- were found to participate in the synergistic process of TC degradation, in which the presence of PMS promoted the production of & BULL;O2- via OVs active sites instead of inhibition. Importantly, the immobilized BiOCl/BiOBr@FACs composites exhibited floatability on the water surface and were readily excited by visible light, making them suitable for reuse and practical applications. This study presents an innovative approach for designing recyclable photocatalysts and achieving efficient wastewater treatment with the assistance of PMS.
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页数:13
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