期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 156, 期 -, 页码 1041-1046出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2015.08.024
关键词
Ferrate; Permanganate; Herbicides; Pesticides; pH; Removal
资金
- Operational Program Education for Competitiveness, European Social Fund [CZ.1.07/2.3.00/20.0155]
- Technology Agency of the Czech Republic Competence Centers [TE01020218]
- Palacky University [IGA PrF 2014017]
- Ministry of Education, Youth and Sports of the Czech Republic [LO1305]
The occurrence of common herbicides (Atrazine, ATZ and lodosulfuron, IDS), in waters presents potential risk to human and ecological health. The oxidative degradation of ATZ and IDS by ferrate(VI) (FeO42-)-O-VI, Fe(VI) is studied at different pH levels where kinetically observed second-order rate constants (kapp, M-1 s(-1)) decreased with increase in pH from 6.0 to 9.0. The determination of the rate constants for the Fe(VI) species, HFeO4- and FeO42-, with the herbicides using acid-base equilibria of Fe(VI) suggested that the HFeOZ species was largely responsible for the pH dependence behavior of kapp. The title herbicides degraded >90% within 10 min using excess weighted amounts of Fe(VI) over IDS (2:1) ATZ (20:1) and in the pH range of 6.0-9.0. Comparatively, degradations of ATZ and IDS by Mn(VII) were 70% and 40% under same conditions; - showing a superior efficiency of ferrate(VI) in degradation of toxic herbicides. The oxidized products of ATZ and IDS by Fe(VI) at a neutral pH were examined by liquid chromatography-tandem mass spectrometry (LC/MS/MS) analysis, which indicated that Fe(VI) attacked on the sulfonamide and alkyl chain moieties of ATZ and IDS, respectively. (C) 2015 Elsevier B.V. All rights reserved.
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