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Enhanced Fenton-like degradation of TCE in sand suspensions with magnetite by NTA/EDTA at circumneutral pH

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Abstract

The present study investigated the degradation of trichloroethylene (TCE) in sand suspensions by Fenton-like reaction with magnetite (Fe3O4) in the presence of various chelators at circumneutral pH. The results showed that ethylenediaminetetraacetic acid (EDTA) and nitrilotriacetic acid (NTA) greatly improved the rate of TCE degradation, while [S,S]-ethylenediaminedisuccinic acid (s,s-EDDS), malonate, citrate, and phytic acid (IP6) have minimal effects on TCE degradation. Quenching tests suggested that TCE was mainly degraded by hydroxyl radical (HO·) attack, with about 90% inhibition on TCE degradation by the addition of HO· scavenger 2-propanol. The presence of 0.1–0.5% Fe3O4/sand (w/w) contributed to 40% increase in TCE degradation rates. In particular, the use of chelators can avoid high concentrations of H2O2 required for the Fenton-like reaction with Fe3O4, and moreover improve the stoichiometric efficiencies of TCE degradation to H2O2 consumption. The suitable concentrations of chelators (EDTA and NTA) and H2O2 were suggested to be 0.5 and 20 mM, respectively. Under the given conditions, degradation rate constants of TCE were obtained at 0.360 h−1 with EDTA and 0.526 h−1 with NTA, respectively. Enhanced degradation of TCE and decreased usage of H2O2 in this investigation suggested that Fenton-like reaction of Fe3O4 together with NTA (or EDTA) may be a promising process for remediation of TCE-contaminated groundwater.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant No. 21507096), the Natural Science Foundation of Jiangsu Province (Grant No. BK20140341), and in part by the Key Laboratory of Water Environment and Marine Biological Resources Protection of Zhejiang Province (Grant No. KF201504).

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Authors and Affiliations

  1. Suzhou Key Laboratory of Green Chemical Engineering, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, People’s Republic of China

    Na Wang, Daqing Jia, Yaoyao Jin & Sheng-Peng Sun

  2. College of Life and Environmental Sciences, Wenzhou University, Wenzhou, Zhejiang, 325035, People’s Republic of China

    Qiang Ke

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  1. Na Wang
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  2. Daqing Jia
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  3. Yaoyao Jin
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  4. Sheng-Peng Sun
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  5. Qiang Ke
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Correspondence to Sheng-Peng Sun.

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Responsible editor: Vítor Pais Vilar

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Wang, N., Jia, D., Jin, Y. et al. Enhanced Fenton-like degradation of TCE in sand suspensions with magnetite by NTA/EDTA at circumneutral pH. Environ Sci Pollut Res 24, 17598–17605 (2017). https://doi.org/10.1007/s11356-017-9387-5

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  • DOI: https://doi.org/10.1007/s11356-017-9387-5

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