Efficient mineralization of TBBPA via an integrated photocatalytic reduction/oxidation process mediated by MoS2/SnIn4S8 photocatalyst

Rengui Weng; Feng Tian; Zhendong Yu; Jiachen Ma; Yuancai Lv; Beidou Xi

doi:10.1016/j.chemosphere.2021.131542

Efficient mineralization of TBBPA via an integrated photocatalytic reduction/oxidation process mediated by MoS₂/SnIn₄S₈ photocatalyst

Chemosphere. 2021 Dec:285:131542. doi: 10.1016/j.chemosphere.2021.131542. Epub 2021 Jul 13.

Authors

Rengui Weng¹, Feng Tian², Zhendong Yu³, Jiachen Ma⁴, Yuancai Lv⁵, Beidou Xi⁶

Affiliations

¹ Indoor Environment Engineering Research Center of Fujian Province, Fujian University of Technology, Fuzhou, 350118, China. Electronic address: wengrengui109@126.com.
² Indoor Environment Engineering Research Center of Fujian Province, Fujian University of Technology, Fuzhou, 350118, China. Electronic address: 2108909059@qq.com.
³ Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, Department of Environmental Science and Engineering, Fuzhou University, Fuzhou, 350116, China. Electronic address: n190627064@fzu.edu.cn.
⁴ Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, Department of Environmental Science and Engineering, Fuzhou University, Fuzhou, 350116, China. Electronic address: n190627046@fzu.edu.cn.
⁵ Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, Department of Environmental Science and Engineering, Fuzhou University, Fuzhou, 350116, China. Electronic address: yclv@fzu.edu.cn.
⁶ Indoor Environment Engineering Research Center of Fujian Province, Fujian University of Technology, Fuzhou, 350118, China. Electronic address: 19821499@fjut.edu.cn.

PMID: 34329122
DOI: 10.1016/j.chemosphere.2021.131542

Abstract

Currently, Tetrabromobisphenol A (TBBPA) has been regarded as an emerging organic pollutant and efficient TBBPA elimination technology has been attracting increasing attention. In this work, a novel photocatalyst, MoS₂/SnIn₄S₈, was synthesized through hydrothermal method by introducing few-layer MoS₂ nanosheets and then employed to establish an integrated photocatalytic reduction/oxidation system for the remediation of TBBPA under visible light. The characterization results demonstrated that the few-layer MoS₂ nanosheets were well combined with SnIn₄S₈ and significantly lowered the recombination rate of the photo-induced electron and holes, leading to outstanding photocatalytic performance of MoS₂/SnIn₄S₈ composite. Besides, the MoS₂/SnIn₄S₈ composite also exhibited excellent reusability (over 10 runs) and stability. The TBBPA degradation experiments showed that the integrated photocatalytic reduction/oxidation system was able to completely degrade TBBPA and mineralize its byproducts (60.2 ± 2.9%). In the photocatalytic reduction, due to the cleavage of C-Br bonds by photo-induced electrons, TBBPA underwent stepwise debromination and finally transferred into BPA in 6 h. In the following photocatalytic oxidation, under the attack of reactive oxygen species (¹O₂, h⁺,OH and O₂^-), BPA was first decomposed into aromatic products (such as phenol, benzoic acid, p-hydroxybenzyl alcohol and so on) via C-C bond cracking and hydroxylation, and then further oxidized into organic acids like maleic acid and muconic acid through ring-opening, and finally mineralized into CO₂ and H₂O. What was noteworthy was that the final effluent from the photocatalytic reduction/oxidation system showed no toxicity to the luminescent bacteria.

Keywords: Degradation; Metal sulfide photocatalysts; Photocatalytic oxidation; Photocatalytic reduction; TBBPA.

MeSH terms

Catalysis
Molybdenum*
Piperidines
Polybrominated Biphenyls*

Substances

Piperidines
Polybrominated Biphenyls
S(8)
Molybdenum
tetrabromobisphenol A