In-situ decoration of metallic Bi on BiOBr with exposed (110) facets and surface oxygen vacancy for enhanced solar light photocatalytic degradation of gaseous n-hexane

doi:10.1016/S1872-2067(19)63496-0

Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (10): 1603-1612.DOI: 10.1016/S1872-2067(19)63496-0

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In-situ decoration of metallic Bi on BiOBr with exposed (110) facets and surface oxygen vacancy for enhanced solar light photocatalytic degradation of gaseous n-hexane

Qingqing Yu^a, Jiangyao Chen^a,b, Yanxu Li^a, Meicheng Wen^a, Hongli Liu^a,b, Guiying Li^a,b, Taicheng An^a

a Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, Guangdong, China;
b Synergy Innovation Institute of GDUT, Shantou 515041, Guangdong, China

Received:2020-02-28 Revised:2020-03-23 Online:2020-10-18 Published:2020-08-15
Supported by:
This work was supported by the National Natural Science Foundation of China (21777032 and 41425015), the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01Z032), and The Innovation Team Project of Guangdong Provincial Department of Education, China (2017KCXTD012).

Abstract

Abstract: Photocatalytic degradation of gaseous pollutants on Bi-based semiconductors under solar light irradiation has attracted significant attention. However, their application in gaseous straight-chain alkane purification is still rare. Here, a series of Bi/BiOBr composites were solvothermally synthesized and applied in solar-light-driven photocatalytic degradation of gaseous n-hexane. The characterization results revealed that both increasing number of functional groups of alcohol solvent (from methanol and ethylene glycol to glycerol) and solvothermal temperature (from 160 and 180 to 200℃) facilitated the in-situ formation of metallic Bi nanospheres on BiOBr nanoplates with exposed (110) facets. Meanwhile, chemical bonding between Bi and BiOBr was observed on these exposed facets that resulted in the formation of surface oxygen vacancy. Furthermore, the synergistic effect of optimum surface oxygen vacancy on exposed (110) facets led to a high visible light response, narrow band gap, great photocurrent, low recombination rate of the charge carriers, and strong·O₂^- and h⁺ formation, all of which resulted in the highest removal efficiency of 97.4% within 120 min of 15 ppmv of n-hexane on Bi/BiOBr. Our findings efficiently broaden the application of Bi-based photocatalysis technology in the purification of gaseous straight-chain pollutants emitted by the petrochemical industry.

Key words: Bi/BiOBr composite, Exposed (110) facet, surface oxygen vacancy, Solar light photocatalysis, Degradation of gaseous alkane

Qingqing Yu, Jiangyao Chen, Yanxu Li, Meicheng Wen, Hongli Liu, Guiying Li, Taicheng An. In-situ decoration of metallic Bi on BiOBr with exposed (110) facets and surface oxygen vacancy for enhanced solar light photocatalytic degradation of gaseous n-hexane[J]. Chinese Journal of Catalysis, 2020, 41(10): 1603-1612.

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In-situ decoration of metallic Bi on BiOBr with exposed (110) facets and surface oxygen vacancy for enhanced solar light photocatalytic degradation of gaseous n-hexane

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