Heterogeneous Degradation of Organic Pollutants by Persulfate Activated by CuO-Fe3O4: Mechanism, Stability, and Effects of pH and Bicarbonate Ions

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Department of Environmental Engineering, Wuhan University, Wuhan 430079, China
Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan
§ Institute of Urban Study, Shanghai Normal University, No.100 Guilin Rd. Shanghai 200234, China
Sustainable Environment Research Center, National Cheng Kung University, Tainan 701, Taiwan
*(Y.H. Huang) Phone: 886-2757575 ×62636; fax: 886-6-2344496; e-mail: [email protected]
*(H. Zhang) Phone: 86-27-68775837; fax: 86-27-68778893; e-mail: [email protected]
Cite this: Environ. Sci. Technol. 2015, 49, 11, 6838–6845
Publication Date (Web):May 8, 2015
https://doi.org/10.1021/acs.est.5b00623
Copyright © 2015 American Chemical Society
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Abstract

Magnetic CuO-Fe3O4 composite was fabricated by a simple hydrothermal method and characterized as a heterogeneous catalyst for phenol degradation. The effects of pH and bicarbonate ions on catalytic activity were extensively evaluated in view of the practical applications. The results indicated that an increase of solution pH and the presence of bicarbonate ions were beneficial for the removal of phenol in the CuO-Fe3O4 coupled with persulfate (PS) process. Almost 100% mineralization of 0.1 mM phenol can be achieved in 120 min by using 0.3 g/L CuO-Fe3O4 and 5.0 mM PS at pH 11.0 or in the presence of 3.0 mM bicarbonate. The positive effect of bicarbonate ion is probably due to the suppression of copper leaching as well as the formation of Cu(III). The reuse of catalyst at pH0 11.0 and 5.6 showed that the catalyst remains a high level of stability at alkaline condition (e.g., pH0 11.0). On the basis of the characterization of catalyst, the results of metal leaching and EPR studies, it is suggested that phenol is mainly destroyed by the surface-adsorbed radicals and Cu(III) resulting from the reaction between PS and Cu(II) on the catalyst. Taking into account the widespread presence of bicarbonate ions in waste streams, the CuO-Fe3O4/PS system may provide some new insights for contaminant removal from wastewater.

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Supporting Information associated with this article includes Table S1 and Figures S1–S8. The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.5b00623.

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