Far-UVC-driven Cr(VI) reduction in alkaline solution: Synergistic effects of iodide and sulfite

碘化物 化学 亚硫酸盐 无机化学 还原(数学) 亚硫酸钠 环境化学 有机化学 几何学 数学
作者
Yida Huang,Min Zhao,Guoxin Li,Yan Lin,Lei Wang
出处
期刊:Journal of Environmental Sciences-china [Elsevier BV]
卷期号:160: 405-413 被引量:1
标识
DOI:10.1016/j.jes.2025.04.047
摘要

Hexavalent chromium (Cr(VI)) is an extremely toxic pollutant in aqueous environment. Chemical reduction is the most employed method in decontamination of Cr(VI). However, the chemical reduction was usually conducted in acidic media, resulting in considerable waste of acid reagents and the following neutralizing agents. In this study, kinetics and mechanisms of Cr(VI) reduction by sulfite in alkaline conditions (pH: 7-10) were investigated. It reveals that Cr(VI) reduction follows pseudo-zero-order kinetics, where the rate constants increased markedly with an in situ irradiation of Far-UVC (UV222). Decreasing pH levels slightly favored the reduction. Iodide ion displayed a notable accelerating effect, which not only save the energy input but also minimize the reductant usage. Chloride, sulfate, and carbonate ions exhibit little effect on the reduction, whereas nitrate and nitrite ions, dissolved oxygen as well as Cu(II) suppressed the reduction significantly, implying that hydrated electrons produced by UV222 played the most important role in the reaction. Compared to the UV254/sulfite/iodide process, UV222/sulfite/iodide demonstrates clear advantages in the reduction kinetics and the sulfite utilization efficiency, underscoring its potential for effective Cr(VI) remediation in various environmental settings.
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