Journal
CHEMICAL ENGINEERING JOURNAL
Volume 246, Issue -, Pages 373-382Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.02.047
Keywords
Thermally activated persulfate (TAP); Chloramphenicol (CAP); Kinetics; Influence factor; Intermediate product
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Funding
- National Natural Science Foundation of China [21277031, 21307014, 21077027, 41271473]
- Doctoral Fund of Ministry of Education of China [20120071120031]
- Shanghai Natural Science Foundation [12ZR1402000]
- Fundamental Research Funds for the Central Universities
- Open Foundation of East China Normal University
- SKLEC Fostering Project for Top Doctoral Dissertations and Scholarship Award for Excellent Doctoral Student
- East China Normal University [XRZZ2012016]
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The feasibility of using thermally activated persulfate (TAP) to degrade chloramphenicol (CAP) in aqueous solution was evaluated. Results showed that CAP degradation followed a pseudo-first-order model under all conditions tested and the observed rate constants well fitted the Arrhenius equation. CAP degradation rate constants (k(obs)) increased with increased temperature and sodium persulfate (SPS) dosage. A lower pH resulted in a greater increase in CAP degradation and the highest degradation efficiency was obtained at pH 2.96. Scavenging tests suggested that sulfate radicals (SO4 center dot-) predominated under acidic conditions, whereas hydroxyl radicals (Ha) gradually predominated under alkaline conditions. Coexisting Cl ions slightly enhanced decomposition at an appropriate concentration ([Cl-](0)/[SPS](0) = 1:1) but inhibited degradation at other levels. The effects of NO3-, H2PO4- and HPO42- on CAP degradation were negligible, whereas NOT, HCO3-, and HA significantly inhibited CAP decomposition. The highest degradation rate was achieved with a single SPS injection. Considering that CAP oxidation in the multi-phases of wastewater matrices by TAP presented slower kinetics, 62.2-96.3% removal efficiencies were achieved within 160 min. The TOC removal ratios after 160 min TAP oxidation increased from 10.7% to 90.1% as the [SPS](0)/[CAP](0) increased from 1:1 to 80:1, respectively. Overall, eleven intermediate products during TAP oxidation were identified, and a primary reaction mechanism was proposed. (c) 2014 Elsevier B.V. All rights reserved.
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