Mechanism insights into photo-assisted peroxymonosulfate activation on oxygen vacancy-enriched nolanites via an electron transfer regime

Xiangji Liu; Xingxing Qiao; Ruqian Yang; Dong Wei; Xinghua Qu; Hailei Cao; Yafeng Li; Zhou Zhong; Jian Lü

doi:10.1016/j.jcis.2023.08.124

Mechanism insights into photo-assisted peroxymonosulfate activation on oxygen vacancy-enriched nolanites via an electron transfer regime

J Colloid Interface Sci. 2023 Dec 15;652(Pt A):912-922. doi: 10.1016/j.jcis.2023.08.124. Epub 2023 Aug 22.

Authors

Xiangji Liu¹, Xingxing Qiao², Ruqian Yang¹, Dong Wei¹, Xinghua Qu¹, Hailei Cao¹, Yafeng Li³, Zhou Zhong⁴, Jian Lü⁵

Affiliations

¹ Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
² College of Resources and Environment (Agricultural Environment and Resources Institute), Shanxi Agricultural University, No.1 Ming Xian Road, Jinzhong 030801, China.
³ State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, No. 2 Xue Yuan Road, Fuzhou 350116, China.
⁴ Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China. Electronic address: zhongzhou91@126.com.
⁵ Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China; State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, No. 2 Xue Yuan Road, Fuzhou 350116, China. Electronic address: jian_lu_fafu@163.com.

PMID: 37634364
DOI: 10.1016/j.jcis.2023.08.124

Abstract

The utilization of photo-assisted persulfate activation for the removal of organic contaminants in water has garnered significant research interest in recent times. However, there remains a lack of clarity regarding specific contributions of light irradiation and catalyst structure in this process. Herein, a photo-assisted peroxymonosulfate (PMS) activation system is designed for the highly efficient degradation of organic contaminants on oxygen vacancy-enriched nolanites (Vo-FVO). Results suggest that the degradation of bisphenol A (BPA) in this system is a nonradical-dominated process via an electron transfer regime, in which V_O improves the local electron density and thus facilitates the electron shuttling between BPA and PMS. During BPA degradation, PMS adsorbed at the surface of FVO-180 withdraws electrons near V_O and forms FVO-PMS* complexes. Upon light irradiation, photoelectrons effectively restore the electron density around V_O, thereby enabling a sustainable electron transfer for the highly efficient degradation of BPA. Overall, this work provides new insights into the mechanism of persulfate activation based on defects engineering in nolanite minerals.

Keywords: Catalytic degradation; Electron transfer; Organic contaminant; Oxygen vacancy; Peroxymonosulfate activation.