Remediation of chromium-slag leakage with electricity cogeneration via a urea-Cr(VI) cell.

Remediation of chromium-slag leakage with electricity cogeneration via a urea-Cr(VI) cell.
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通过尿素-Cr(VI) 电池进行热电联产修复铬渣泄漏。

DOI:
10.1038/srep05860
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发表时间:
2014-08-29
期刊:
影响因子:
4.6
通讯作者:
Wu Z
Wu Z
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yu B;Zhang H;Xu W;Li G;Wu Z

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铬污染历来在世界范围内普遍存在。大多数可用的补救技术通常需要消耗能源。本研究的目的是利用自产电对铬渣泄漏中的Cr(VI)进行电化学修复。对铬渣试样进行了动态浸出试验,研究了Cr(VI)的释放和浸出行为。在前人工作的基础上,设计了一种独特的尿素-Cr(VI)材料,以尿素为燃料,重铬酸盐渣中泄漏的Cr(VI)作为氧化剂。电化学结果表明,当泄漏Cr(VI)浓度为2.69 mM时,18 h Cr(VI)去除率可达96%以上。不同初始Cr(VI)泄漏浓度下,断路电位(OCP)在1.56 ~ 1.59 V范围内变化。该方法探索了在不需要能源输入的情况下,同时进行铬渣修复和发电的有前途的技术的可行性。
Chromium pollution has been historically widespread throughout the world. Most available remediation technologies often require energy consumption. This study is aimed to develop electrochemical remediation for Cr(VI) in chromium-slag leakage with self-generated electricity. Dynamic leaching experiments of chromium-slag samples were conducted to survey the release and leaching behavior of Cr(VI). Based on previous work, a unique urea-Cr(VI) was designed, in which urea was employed as the fuel and Cr(VI) from the leakage of the dichromate slag served as the oxidant. Furthermore, the electrochemical results showed that the removal percent of Cr(VI) was more than 96% after 18 h with the leakage Cr(VI) concentration of 2.69 mM. The open circuit potential (OCP) varied in the range of 1.56 ~ 1.59 V under different initial Cr(VI) leakage concentrations. The approach explores the feasibility of the promising technique without the need of energy input for simultaneous chromium-slag remediation and generation of electricity.
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