期刊
ENVIRONMENTAL CHEMISTRY LETTERS
卷 17, 期 2, 页码 1017-1021出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10311-018-0815-7
关键词
Green rust; Persulfate; UV-LED; Sulfate radical; Hydroxyl radical; Benzoic acid
资金
- National Natural Science Foundation of China [51508423]
- China Postdoctoral Science Foundation [2017M622513]
- Start-up Fund for Distinguished Scholars, Wuhan University [1403-413100041]
- Fundamental Research Funds for the Central University [2042018kf0040, 21618343]
Metal-activated persulfate is an efficient reagent for the oxidative degradation of organic contaminants. However, homogenous catalytic activation of persulfate has the drawbacks of narrow pH range and metal ion contamination. Here, we designed a heterogeneous system for persulfate activation by green rust irradiated withultraviolet light-emitting diode for the removal of organic pollutants. Generated radicals were identified through radical quenching experiments. Results show that benzoic acid can be degraded. Although structural Fe-II in green rust can activate persulfate, the rapid oxidation of Fe-II-Fe-III by persulfate quickly ceases further persulfate activation in the absence of UV irradiation. Here, UV irradiation reduces the generated Fe-III on the surface of green rust to Fe-II for prolonged persulfate activation. The highest benzoic acid degradation was obtained with 1.0mM persulfate and 0.5mM green rust, expressed as Fe-II concentration. HO is the main oxidative species responsible for benzoic acid degradation.
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