Issue 47, 2022, Issue in Progress
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RSC Advances

Visible-light photoelectrocatalysis/H2O2 synergistic degradation of organic pollutants by a magnetic Fe3O4@SiO2@mesoporous TiO2 catalyst-loaded photoelectrode†

Bo Zhang,a   Xuemei Li, ORCID logo *a   Yongshan Ma, ORCID logo a   Tianyi Jiang,a   Yanyan Zhua  and  Huixue Rena  

* Corresponding authors

a School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China
E-mail: ch1889l@sdjzu.edu.cn

Abstract

In this paper, we describe a method for photoelectrocatalysis (PEC)/H2O2 synergistic degradation of organic pollutants with a magnetic Fe3O4@SiO2@mesoporous TiO2 (FST) photocatalyst-loaded electrode. At optimal conditions of pH 3.0, 2.25% H2O2, working electrode (fixed FST 30 mg) potential +0.6 V (vs. SCE), and 10 mg L−1 of all experimental pollutants, the FST PEC/H2O2 synergistic system exhibited high activity and stability for the removal of various organic pollutants under visible light with comparable degradation efficiencies, including MB (98.8%), rhodamine B (Rh B, 96.7%), methyl orange (MO, 97.7%), amoxicillin (AMX, 83.9%). Moreover, this system obtained TOC removal ratios of 83.5% (MB), 77.9% (Rh B), 80.2% (MO), 65.5% (AMX) within 8 min. The kinetic rate constants of the PEC/H2O2 synergistic system were nearly 53 and 1436 times higher than that of the PEC process and H2O2 photolysis under visible light, respectively. Furthermore, the main reactive oxidant species (˙OH, ˙O2−) were studied and enhanced mechanisms of the photocatalytic-electro-H2O2 coupling system were proposed. This work brings new insights to efficiently purify organic pollutants by PEC coupled with peroxide under solar light illumination.

Graphical abstract: Visible-light photoelectrocatalysis/H2O2 synergistic degradation of organic pollutants by a magnetic Fe3O4@SiO2@mesoporous TiO2 catalyst-loaded photoelectrode

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Article information

DOI
https://doi.org/10.1039/D2RA05183D
Article type
Paper
Submitted
18 Aug 2022
Accepted
21 Oct 2022
First published
26 Oct 2022
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2022,12, 30577-30587

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Visible-light photoelectrocatalysis/H2O2 synergistic degradation of organic pollutants by a magnetic Fe3O4@SiO2@mesoporous TiO2 catalyst-loaded photoelectrode

B. Zhang, X. Li, Y. Ma, T. Jiang, Y. Zhu and H. Ren, RSC Adv., 2022, 12, 30577 DOI: 10.1039/D2RA05183D

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