Degradation of chloramphenicol by persulfate activated by Fe2+ and zerovalent iron

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作者：
20152300914981
机构：
[1] [1,2,Nie, Minghua
[2] 2,Yan, Caixia
[3] 1,Li, Meng
[4] Wang, Xiaoning
[5] Bi, Wenlong
[6] Dong, Wenbo
来源：
Dong, Wenbo | 1600年 / Elsevier B.V., Netherlands卷 / 279期
关键词：
This study evaluated the removal of chloramphenicol (CAP) by persulfate (PS) activated by Fe2+ and zerovalent iron (ZVI). Results showed that the Fe2+-PS system ineffectively degraded CAP. However; CAP oxidation accelerated as the number of Fe2+ portions added increased. Comparing with Fe2+; up to 96.1% of CAP was degraded when ZVI was employed as an alternative source of Fe2+. The ZVI-PS system was effective in a broader initial pH range from 3 to 10; and low pH promoted CAP degradation. In addition; the results of scavenging tests suggested that HO; SO4- and O2- contributed to the overall degradation performance; but HO predominated at all pH levels used. The rate of CAP removal slightly increased upon the addition of 1mM Cl-; but adding Cl- at concentrations higher than 1mM apparently inhibited CAP degradation. HCO3-; NO3-; NO2-; H2PO4-; HPO42-; and HA significantly inhibited CAP decomposition. Up to 92.8%; 94.7%; and 75.7% of CAP were removed from the filtrate; permeate; and retentate phases of wastewater; respectively. This result indicated that the ZVI-PS system can significantly remove CAP from wastewater and even concentrated wastewater. The intermediate products during oxidation were identified; and the degradation pathways of CAP were tentatively proposed. © 2015 Elsevier B.V.;
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