过硫酸盐
环境修复
氰化物
化学
铁氰化物
环境化学
活性炭
萃取(化学)
降级(电信)
土壤污染
亚铁氰化物
分解
无机化学
土壤水分
污染
催化作用
有机化学
吸附
生态学
电信
环境科学
电极
物理化学
计算机科学
土壤科学
生物
作者
Yunmei Wei,Shuang Chen,Tingting Ren,Lianying Chen,Yuanyuan Liu,Jianhong Gao,Yunyi Li
出处
期刊:Chemosphere
[Elsevier]
日期:2022-04-01
卷期号:292: 133463-133463
被引量:12
标识
DOI:10.1016/j.chemosphere.2021.133463
摘要
Persulfate (PS)-based advanced oxidation processes have been frequently employed for contaminant remediation, but the effectiveness of PS oxidation for the elimination of cyanide-bearing contaminants from soil, and the underlying mechanisms, have rarely been explored. This study investigated the degradation of two iron-cyanide (Fe-CN) complexes (ferricyanide and ferrocyanide) with thermally activated PS via two remediation strategies, namely one-step oxidation (direct PS oxidation) and two-step oxidation (alkaline extraction followed by PS oxidation). The two-step oxidation process was more effective for the elimination of cyanide pollutants from soil, reaching >94% remediation efficiency for both Fe-CN complexes studied. The presence of dissolved soil components, especially soil organic matter, increased consumption of PS during the remediation process. A combined analysis based on electron paramagnetic resonance (EPR), free radical scavenging, and degradation product identification revealed that SO4- and HO were the principal reactive radicals responsible for Fe-CN degradation. Based on the determination of radical species and identification of decomposition products, a transformation pathway for Fe-CN complexes during thermally activated PS oxidation is proposed. Overall, this study demonstrates the effectiveness of the thermally activated PS oxidation technique for cyanide elimination from polluted soil. Further study is required to verify the feasibility of this method for field applications.
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