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Treatment of aqueous solutions of 1,4-dioxane by ozonation and catalytic ozonation with copper oxide (CuO)

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posted on 11.12.2018 by Gidiane Scaratti, Alex Basso, Richard Landers, Pedro J.J. Alvarez, Gianluca Li-Puma, Regina F.P.M. Moreira
© 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group. In this study, treatment for the removal of 1,4-dioxane by ozone and by catalytic ozonation using CuO as the catalyst was investigated. While the removal of 1,4-dioxane was small (20%) and mineralization negligible after 6 h of ozonation treatment, the removals of 1,4-dioxane and total organic carbon increased by factors of 10.35 and 81.25, respectively, after catalytic ozonation in the presence of CuO. The mineralization during catalytic ozonation was favoured at pH 10 (94.91 min−1), although it proceeded even at pH 3 (54.41 min−1). The CuO catalyst decreased the equilibrium concentration of soluble ozone and favoured its decomposition to reactive oxidative species. Radical scavenging experiments demonstrated that superoxide radicals were the main species responsible for the degradation of 1,4-dioxane. Further scavenging experiments with phosphate confirmed the presence of Lewis active sites on the surface of CuO, which were responsible for the adsorption and decomposition of ozone. The reaction mechanism proceeded through the formation of ethylene glycol diformate, which quickly hydrolyzed to ethylene glycol and formic acid as intermediate products. The stability of CuO indicated weak copper leaching and high catalytic activity for five recycling cycles. The toxicity of the water, assessed by Vibrio fischeri bioluminescence assays, remained the same (low toxicity) after catalytic ozonation while it increased after treatment with ozonation alone.

Funding

The authors would like to acknowledge CAPES/Brazil (Coordination for the Improvement of Higher Education Personnel) for scholarships, CNPq/Brazil (Brazilian Council for Scientific and Technological Development) for financial support (grant number 405892/2013 6).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Environmental Technology

Volume

41

Issue

11

Pages

1464 - 1476

Citation

SCARATTI, G. ... et al., 2018. Treatment of aqueous solutions of 1,4-dioxane by ozonation and catalytic ozonation with copper oxide (CuO). Environmental Technology, 41 (11), pp.1464-1476.

Publisher

© Taylor and Francis

Version

AM (Accepted Manuscript)

Publisher statement

This is an Accepted Manuscript of an article published by Taylor & Francis in Environmental Technology on 29 Oct 2018, available online: https://doi.org/10.1080/09593330.2018.1538259

Acceptance date

12/10/2018

Publication date

2018-10-29

ISSN

0959-3330

eISSN

1479-487X

Language

en

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