Exposed {110} facets of BiOBr anchored to marigold-like MnCo2O4 with abundant interfacial electron transfer bridges and efficient activation of peroxymonosulfate

Mingkun Wu; Bowen Zhang; Haonan Wang; Yao Chen; Minguang Fan; Lihui Dong; Bin Li; Guoning Chen

doi:10.1016/j.jcis.2023.09.106

Exposed {110} facets of BiOBr anchored to marigold-like MnCo₂O₄ with abundant interfacial electron transfer bridges and efficient activation of peroxymonosulfate

J Colloid Interface Sci. 2024 Jan;653(Pt A):867-878. doi: 10.1016/j.jcis.2023.09.106. Epub 2023 Sep 23.

Authors

Mingkun Wu¹, Bowen Zhang², Haonan Wang², Yao Chen², Minguang Fan³, Lihui Dong⁴, Bin Li⁵, Guoning Chen⁶

Affiliations

¹ Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China; School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, PR China.
² Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China.
³ Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China; Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, China. Electronic address: fanmg@gxu.edu.cn.
⁴ Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China; Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, China. Electronic address: donglh@gxu.edu.cn.
⁵ Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China; Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, China.
⁶ Guangxi Bossco Environmental Protection Technology Co., Ltd, Nanning 530007, China.

PMID: 37769365
DOI: 10.1016/j.jcis.2023.09.106

Abstract

Precise charge transfer modification and efficient activation of peroxymonosulfate are effective methods for increasing photocatalytic efficiency. Here, BiOBr/MnCo₂O₄ photocatalysts with abundant Mn-Br bonds were generated by immobilizing the exposed {110} facets of BiOBr in the marigold-like MnCo₂O₄. The prepared BiOBr/MnCo₂O₄ retained the marigold-like morphology of MnCo₂O₄ while exhibiting good adsorption properties and interface contact effects. More importantly, the interfacial Mn-Br bond between MnCo₂O₄ and BiOBr functioned as charge transport bridges, allowing for a directional transfer channel and lowering the potential energy barrier for interfacial charge transfer. In addition, the exposure of the {110} facets exhibited more Mn atom-anchored sites for easy anchoring of BiOBr, significantly solving the stability problem of the bismuth material. Compared to MnCo₂O₄ + BiOBr, which did not form Mn-Br bonds, the MnCo₂O₄/BiOBr heterojunction had more efficient photocatalytic activity (1.3 times) and stability. This suggested that using electronic bridges for directional charge transfer was an efficient way to improve photocatalytic efficiency.

Keywords: BiOBr/MnCo(2)O(4); Interface chemical bonds; Peroxymonosulfate; Photocatalytic degradation; Surface structure.