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Simultaneously degradation of 2,4-Dichlorophenol and EDTA in aqueous solution by the bimetallic Cu–Fe/O2 system

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Abstract

Oxidative degradation of aqueous organic contaminants 2,4-dichlorophenol (2,4-DCP) using ethylenediaminetetraacetic acid (EDTA)-enhanced bimetallic Cu–Fe system in the presence of dissolved oxygen was investigated. The proposed process was applied for the pH range of 3~7 with the degradation efficiency of 2,4-DCP and EDTA varying within 10 %, and achieved at 100 % degradation of 40 mg L−1 2,4-DCP in 1 h, at the initial pH of 3, 25 g L−1 of bimetallic Fe–Cu powder (WCu/WFe = 0.01289) and initial EDTA of 0.57 mM. However, the removal efficiency of 2,4-DCP in control tests were 7.52 % (Cu–Fe/O2 system) and 84.32 % (EDTA-enhanced Fe/O2 process), respectively, after 3 h, reaction. The proposed main mechanism, involves the in situ generation of H2O2 by the electron transfer from Fe0 to O2 which was enhanced by ethylenediaminetetraacetic acid (EDTA), and the in situ generation of ·OH via advanced oxidation reaction. Accordingly, 2,4-DCP was attacked by ·OH to achieve complete dechlorination and low molecular weight organic acids, even mineralized. Systematic studies on the effects of initial EDTA and 2,4-DCP concentration, Cu–Fe dosing, Cu content, and pH revealed that these effects need to be optimized to avoid the excessive consumption of ·OH and new EDTA and heavy metal Cu pollution.

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Acknowledgments

This study has been financially supported by National Natural Science Foundation of China (no. 51108330) and State Key Laboratory of Pollution Control and Resource Reuse Foundation (no. PCRRY11005).

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Authors and Affiliations

  1. National Engineering Research Center for Urban Pollution Control, Tongji University, Shanghai, 200092, China

    Xin Liu, Jin-Hong Fan & Lu-Ming Ma

  2. State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China

    Xin Liu, Jin-Hong Fan & Lu-Ming Ma

  3. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu Province, 215009, China

    Xin Liu

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  1. Xin Liu
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Correspondence to Jin-Hong Fan.

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Liu, X., Fan, JH. & Ma, LM. Simultaneously degradation of 2,4-Dichlorophenol and EDTA in aqueous solution by the bimetallic Cu–Fe/O2 system. Environ Sci Pollut Res 22, 1186–1198 (2015). https://doi.org/10.1007/s11356-014-3372-z

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