CuS enabled efficient Fenton-like oxidation of phenylarsonic acid and inorganic arsenic immobilization.

Wei Liu, Fengfeng Zhou, Huan Yang, Yunxiao Shi, Yaxin Qin, Hongwei Sun, Lizhi Zhang
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Abstract

Herein, copper sulfide (CuS) was introduced to the Fenton-like (Fe(III)/H2O2) system for the efficient removal of phenylarsonic acid (PAA). Results of reactive oxygen and Fe/Cu species showed that CuS preferentially reacted with Fe(III) and H2O2 to generate Cu(I) and superoxide anion (•O2-). These reductive species could efficiently promote the Fe(III)/Fe(II) and Cu(II)/Cu(I) cycles, and are beneficial to the sequential Fenton reaction to generate •OH. The organoic/inorganic arsenic species detected in the CuS/Fe(III)/H2O2 system confirmed that PAA was oxidized by •OH to hydroxylated organoarsenic and phenolic intermediates, which were further mineralized to oxalate and formic acid. Meanwhile, the inorganic As(III)/As(V) released during PAA degradation were efficiently immobilized by CuS. The PAA removal efficiency remained as high as 92.9 % after 5 cycles of the CuS-mediated Fenton-like process. These results demonstrate an innovative method for the treatment of organoarsenic-contaminated water, and provide new insights into the enhanced Fenton-like process utilizing sulfide minerals.

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CuS 实现了苯胂酸的高效芬顿式氧化和无机砷固定。
在此,硫化铜(CuS)被引入到类似芬顿(Fe(III)/H2O2)的体系中,以高效去除苯胂酸(PAA)。活性氧和铁/铜物种的研究结果表明,CuS 优先与 Fe(III) 和 H2O2 反应生成 Cu(I) 和超氧阴离子 (-O2-)。这些还原物种可有效促进 Fe(III)/Fe(II) 和 Cu(II)/Cu(I) 循环,并有利于 Fenton 顺序反应生成 -OH。在 CuS/Fe(III)/H2O2 体系中检测到的有机砷/无机砷物种证实 PAA 被 -OH 氧化成羟基化的有机砷和酚类中间产物,并进一步矿化成草酸和甲酸。同时,PAA 降解过程中释放的无机砷(III)/砷(V)被 CuS 有效固定。在 CuS 介导的类芬顿过程中,经过 5 个循环后,PAA 的去除率仍高达 92.9%。这些结果展示了一种处理有机砷污染水的创新方法,并为利用硫化物矿物质增强类芬顿过程提供了新的见解。
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