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磁性FeO@SiO@介孔TiO负载光电极可见光光电催化/HO协同降解有机污染物

Visible-light photoelectrocatalysis/HO synergistic degradation of organic pollutants by a magnetic FeO@SiO@mesoporous TiO catalyst-loaded photoelectrode.

作者信息

Zhang Bo, Li Xuemei, Ma Yongshan, Jiang Tianyi, Zhu Yanyan, Ren Huixue

机构信息

School of Municipal and Environmental Engineering, Shandong Jianzhu University Jinan 250101 Shandong China

出版信息

RSC Adv. 2022 Oct 26;12(47):30577-30587. doi: 10.1039/d2ra05183d. eCollection 2022 Oct 24.

DOI:10.1039/d2ra05183d
PMID:36337955
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9597414/
Abstract

In this paper, we describe a method for photoelectrocatalysis (PEC)/HO synergistic degradation of organic pollutants with a magnetic FeO@SiO@mesoporous TiO (FST) photocatalyst-loaded electrode. At optimal conditions of pH 3.0, 2.25% HO, working electrode (fixed FST 30 mg) potential +0.6 V ( SCE), and 10 mg L of all experimental pollutants, the FST PEC/HO 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/HO synergistic system were nearly 53 and 1436 times higher than that of the PEC process and HO photolysis under visible light, respectively. Furthermore, the main reactive oxidant species (˙OH, ˙O ) were studied and enhanced mechanisms of the photocatalytic-electro-HO coupling system were proposed. This work brings new insights to efficiently purify organic pollutants by PEC coupled with peroxide under solar light illumination.

摘要

在本文中，我们描述了一种利用负载磁性FeO@SiO@介孔TiO（FST）光催化剂的电极进行光电催化（PEC）/H₂O₂协同降解有机污染物的方法。在pH 3.0、2.25% H₂O₂、工作电极（固定FST 30 mg）电位 +0.6 V（SCE）以及所有实验污染物浓度为10 mg/L的最佳条件下，FST PEC/H₂O₂协同体系在可见光下对各种有机污染物的去除表现出高活性和稳定性，降解效率相当，包括亚甲基蓝（MB，98.8%）、罗丹明B（Rh B，96.7%）、甲基橙（MO，97.7%）、阿莫西林（AMX，83.9%）。此外，该体系在8分钟内对MB、Rh B、MO、AMX的总有机碳（TOC）去除率分别为83.5%、77.9%、80.2%、65.5%。PEC/H₂O₂协同体系的动力学速率常数分别比可见光下PEC过程和H₂O₂光解的速率常数高出近53倍和1436倍。此外，研究了主要的活性氧化物种（˙OH、˙O₂⁻），并提出了光催化 - 电 - H₂O₂耦合体系的增强机制。这项工作为在太阳光照射下通过PEC与过氧化物耦合高效净化有机污染物带来了新的见解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21e5/9597414/a159c146205a/d2ra05183d-f9.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21e5/9597414/6c4f82733572/d2ra05183d-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21e5/9597414/a159c146205a/d2ra05183d-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21e5/9597414/95e52f57768e/d2ra05183d-f1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/21e5/9597414/0ddd5c08f686/d2ra05183d-f6.jpg
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