Degradation of Triclosan by Recyclable MnFe2O4-Activated PMS: Process Modification for Reduced Toxicity and Enhanced Performance

  • Hiu-Lam So
    Hiu-Lam So
    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
    More by Hiu-Lam So
  • Koon-Yee Lin
    Koon-Yee Lin
    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
    More by Koon-Yee Lin
  • Wei Chu*
    Wei Chu
    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
    *E-mail: [email protected]. Phone: +1-852-2766-6075. Fax: +1-852-2334-6389.
    More by Wei Chu
  • , and 
  • Han Gong
    Han Gong
    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
    More by Han Gong
Cite this: Ind. Eng. Chem. Res. 2020, 59, 10, 4257–4264
Publication Date (Web):February 14, 2020
https://doi.org/10.1021/acs.iecr.9b05481
Copyright © 2020 American Chemical Society
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Abstract

The degradation of triclosan (TCS) by MnFe2O4/PMS was investigated. The system was able to remove TCS in less than 20 min. Recycled MnFe2O4 was found to be more efficient than fresh MnFe2O4 for TCS degradation as a result of the alteration of Mn sites by peroxymonosulfate (PMS), leading to an extra degradation pathway where no oxidants are required. A modified treatment process is originally proposed in this study by preactivating the catalyst with PMS prior to the succeeding reactions, as the toxicity test showed that PMS may have a lethal effect on aquatic animals. The results showed that the preactivated catalyst provides satisfactory results with the total removal of TCS in 20 min at neutral pH, whereas the modified process minimizes the direct addition of PMS to the bulk solution and therefore the potential toxicity to the aquatic life forms.

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  • Characteristics of secondary effluent collected; XPS spectra of fresh and reused MnFe2O4; and magnetic hysteresis loop of MnFe2O4 before and after use (PDF)

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This article is cited by 7 publications.

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  2. Kunjie Hou, Zhoujie Pi, Fei Chen, Li He, Fubing Yao, Shengjie Chen, Xiaoming Li, Dongbo Wang, Haoran Dong, Qi Yang. Peroxymonosulfate (PMS) activation by mackinawite for the degradation of organic pollutants: Underappreciated role of dissolved sulfur derivatives. Science of The Total Environment 2021, 37 , 151421. https://doi.org/10.1016/j.scitotenv.2021.151421
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  4. Yutao Peng, Hongmei Tang, Bin Yao, Xing Gao, Xiao Yang, Yaoyu Zhou. Activation of peroxymonosulfate (PMS) by spinel ferrite and their composites in degradation of organic pollutants: A Review. Chemical Engineering Journal 2021, 414 , 128800. https://doi.org/10.1016/j.cej.2021.128800
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