1. FeS 2 assisted degradation of atrazine by bentonite-supported nZVI coupling with hydrogen peroxide process in water: Performance and mechanism.
- Author
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Diao ZH and Chu W
- Abstract
In this study, bentonite-supported nZVI (B-nZVI) was used as a catalyst to activate H
2 O2 for atrazine (ATZ) degradation in the presence of FeS2 . Results indicated that ATZ degradation by B-nZVI/H2 O2 process was significantly enhanced when FeS2 was introduced, and nearly 98% of ATZ was degraded by B-nZVI/FeS2 /H2 O2 process within 60 min under the optimum conditions. ATZ degradation of B-nZVI/FeS2 /H2 O2 process was much higher than the sum of B-nZVI and FeS2 /H2 O2 processes. The presence of HCO3 - , PO4 3- and F- exhibited significant negative effects on the ATZ degradation, whereas both Cu2+ and Ni2+ exhibited positive effects on that. Both citric acid (CA) and ethylenediaminetetraacetic acid (EDTA) with lower concentration enhanced ATZ degradation rate, but significant suppression effects on that with higher concentration. The degradation of ATZ and 2,4-Dichlorophenol (2,4-DCP) could be simultaneously achieved in B-nZVI/FeS2 /H2 O2 process under certain conditions. High soluble Fe2+ induced an excellent decomposition of H2 O2 by B-nZVI and FeS2 . OH was dominant radical, and contributed to nearly 86% of the overall ATZ removal. A total of five intermediate products of ATZ were identified, and ATZ degradation was achieved via de-alkylation and hydroxylation processes. An enhanced reaction mechanism for ATZ degradation by B-nZVI/FeS2 /H2 O2 process was proposed, and B-nZVI/FeS2 /H2 O2 process exhibited an excellect catalytic performance within four successive runs., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier B.V. All rights reserved.)- Published
- 2021
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