Dual H2O2 production paths over chemically etched MoS2/FeS2 heterojunction: Maximizing self-sufficient heterogeneous Fenton reaction rate under the neutral condition

罗丹明B 异质结 光化学 食腐动物 产量(工程) 硫黄 降级(电信) 材料科学 水溶液 化学工程 化学 光催化 激进的 光电子学 催化作用 计算机科学 有机化学 工程类 复合材料 电信
作者
Yang Yang,Haochen Yu,Maoquan Wu,Tingting Zhao,Yina Guan,Dong Yang,Yufeng Zhu,Yanqiu Zhang,Shouchun Ma,Jie Wu,Li Liu,Tongjie Yao
出处
期刊:Applied Catalysis B-environmental [Elsevier BV]
卷期号:325: 122307-122307 被引量:20
标识
DOI:10.1016/j.apcatb.2022.122307
摘要

Sufficient generation of H2O2 played an essential role in boosting self-sufficient heterogeneous Fenton reaction. Herein, the dual H2O2 production paths were designed to maximize the yield over H2O2-etched MoS2/FeS2 Z-scheme heterojunction, whose surface was modified with abundant –OH groups and sulfur vacancies (SVs). Mechanism studies revealed that H2O2 was generated via two-step single-electron reduction by electrons on conduction band, where H2O2 production was significantly improved by the internal hole-scavenging effect from –OH groups. Additionally, electrons surrounding SVs served as another sites for H2O2 production via one-step two-electron reduction even in darkness. H2O2 yield in neutral aqueous solution reached 1.5 mM/g/h without external hole scavenger. Tetracycline and rhodamine B were effectively degraded under light or in darkness. The degradation performance was even comparable to the heterogeneous Fenton reaction. This work provides new insights for the design of self-sufficient heterogeneous Fenton system with exceptional degradation performance.
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