Simultaneous oxidation of As(III) and reduction of Cr(VI) by NiS-CdS@biochar through efficient oxalate activation: The key role of enhanced generation of reactive oxygen species

草酸盐 化学 电子顺磁共振 生物炭 光电流 吸附 无机化学 核化学 化学工程 材料科学 热解 核磁共振 光电子学 物理 工程类 有机化学
作者
Ying Yan,Yi Peng,Jing Wang,Ziyang Xiang,Yanmei Li,Junhui Yang,Jinglin Yin,Hongbo Xiao,Wenlei Wang
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:435: 128993-128993 被引量:8
标识
DOI:10.1016/j.jhazmat.2022.128993
摘要

The reutilization of exhausted biochar is attracting extensive interest among researchers. In this study, the biochar generated from Chinese fir with natural regular porous structure that adsorbed Cd2+/Ni2+ at different concentration levels was used as the precursor, and then combined with simple hydrothermal vulcanization and ion deposition to generate the p-n heterojunction between NiS and CdS compounds (NiS-CdS@C) in situ. The hybrids with 3 cycles of NiS deposition reduced the interfacial transmission resistance from 80 Ω to 40 Ω, and increased photocurrent density by 5 times, thus effectively promoting the separation of photogenerated electrons and holes. The simultaneous removal of As(III) and Cr(VI) was selected to evaluate the oxidation and reduction capacity of the visible light/NiS-CdS@C/oxalate system. The results indicated that 10 mg/L As(III) and Cr(VI) were completely and simultaneously removed with 0.75 mM oxalate addition within 40 min in the system, and the NiS-CdS@C presented good durability and stability for oxalate activation. Electron paramagnetic resonance (EPR) and quenching experiments demonstrated that oxalate was activated by holes under light to produce •CO2- and enhanced the generation of additional •OH and •O2-, further contributing to the oxidation of As(III) and reduction of Cr(VI).
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