Enhancement of Fe2+/Fe3+ cycles by the synergistic effect between photocatalytic and co-catalytic of ZnxCd1-xS on photo-Fenton system

催化作用 罗丹明B 光催化 降级(电信) X射线光电子能谱 摩尔比 化学 电子顺磁共振 金属 光化学 核化学 材料科学 化学工程 有机化学 电信 物理 核磁共振 计算机科学 工程类
作者
Haixian Yan,Yusong Pan,Xiuwu Liao,Yuan Zhu,Chengjie Yin,Run Huang,Cheng‐Ling Pan
出处
期刊:Applied Surface Science [Elsevier BV]
卷期号:576: 151881-151881 被引量:20
标识
DOI:10.1016/j.apsusc.2021.151881
摘要

The exploration of new catalysts or co-catalysts to promoting the circulation efficiency between Fe3+ and Fe2+ in photo-Fenton system is of great significance for sewage treatment. Herein, metallic sulfides (ZnxCd1-xS) with different molar ratio of Zn/Cd were constructed by a facile solvothermal technology and applied to photo-Fenton system as both catalyst and co-catalyst for the first time. The catalytic activity of photo-Fenton systems could be enhanced by adding any as-prepared samples. Moreover, photo-Fenton system containing ZCS-3 (molar ratio of Zn:Cd = 3:7) presented the highest degradation rate for Rhodamine B (RhB, 93.5%), which showed significant improvement compared with that of photo-system without ZCS-3(43.7%). The excellent performance of this photo-Fenton system was mainly ascribed to the synergistic effect between photocatalytic and co-catalytic of ZCS-3. EPR and XPS results confirmed that the Zn2+ in the ZCS-3 would be reduced to Zn+ by the •O2–, which generated under visible light irradiation in photo-Fenton system. Thereby, more Zn+/Zn2+ exposed on the ZCS-3 surface during this photo-Fenton reaction, ensuring the acceleration of conversion between Fe2+ and Fe3+. The catalytic mechanism revealed that the formation of stable double recycles of Zn2+/Zn+ and Fe2+/Fe3+ in catalytic process displayed prominent enhancement for the catalytic properties of the photo-Fenton system.
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