Ti3C2 MXene promoted Fe3+/H2O2 fenton oxidation: Comparison of mechanisms under dark and visible light conditions

Suzhou Xu; Can Liu; Xuping Jiang; Xinyu Wang; Shijin Zhang; Yanting Zhang; Qingguo Wang; Weiling Xiong; Jing Zhang

doi:10.1016/j.jhazmat.2022.130450

Ti₃C₂ MXene promoted Fe³⁺/H₂O₂ fenton oxidation: Comparison of mechanisms under dark and visible light conditions

J Hazard Mater. 2023 Feb 15;444(Pt B):130450. doi: 10.1016/j.jhazmat.2022.130450. Epub 2022 Nov 19.

Authors

Suzhou Xu¹, Can Liu², Xuping Jiang³, Xinyu Wang¹, Shijin Zhang¹, Yanting Zhang¹, Qingguo Wang¹, Weiling Xiong⁴, Jing Zhang⁵

Affiliations

¹ College of Architecture & Environment, Sichuan University, Chengdu 610065, China.
² College of Materials Science & Engineering, Sichuan University, Chengdu 610065, China. Electronic address: liucan@scu.edu.cn.
³ College of Materials Science & Engineering, Sichuan University, Chengdu 610065, China.
⁴ University of Electronic Science and Technology of China, Chengdu 611731, China.
⁵ College of Architecture & Environment, Sichuan University, Chengdu 610065, China. Electronic address: zjing428@163.com.

PMID: 36435043
DOI: 10.1016/j.jhazmat.2022.130450

Abstract

The performance and mechanisms of a titanium carbide (Ti₃C₂) MXene modified Fe³⁺/hydrogen peroxide (H₂O₂) system were compared in detail under dark and visible light conditions, with a new mechanism proposed for the reaction and reduction of MXene by Fe³⁺. Using Bisphenol A (BPA) as the target pollutant, the degradation of BPA by the Fe³⁺/H₂O₂ system was improved after adding MXene in the dark, and the degradation rate of BPA was ≥ 95 % within 12.5 min under visible light, six times higher than that in the dark. Fe²⁺ was ascertained to be the effective component responsible for H₂O₂ activation to produce ·OH. SEM, XPS, ICP, XRD, and FTIR spectroscopy, analyses show that MXene and Fe³⁺ form a complex, and then MXene reacts with Fe³⁺ by breaking the Ti-C bonding to accelerate the Fe³⁺/Fe²⁺ cycle. MXene uses photogenerated electrons to promote this reaction under visible light. In addition, quenching experiments and electron spin resonance spectroscopy results show that ·OH and O₂^•- are the main reactive oxygen species under visible light, while ·OH is the main active species in the dark. MXene thus effectively uses O₂ to form O₂^•- under visible light and promotes the Fe³⁺/Fe²⁺ cycle. This study provides a theoretical basis for the combination of visible light catalysis and the advanced oxidation process of a Ti₃C₂ MXene.

Keywords: Fe(3+)/Fe(2+) cycle; Fenton; Ti(3)C(2) MXene; TiO(2)@C.