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Polyaniline: A New Metal-Free Catalyst for Peroxymonosulfate Activation with Highly Efficient and Durable Removal of Organic Pollutants

  • Bojing Sun
    Bojing Sun
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
    More by Bojing Sun
  • Wenjie Ma
    Wenjie Ma
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
    More by Wenjie Ma
  • Na Wang
    Na Wang
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
    More by Na Wang
  • Ping Xu
    Ping Xu
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
    More by Ping Xu
  • Leijiang Zhang
    Leijiang Zhang
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
  • Bianna Wang
    Bianna Wang
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
    More by Bianna Wang
  • Honghong Zhao
    Honghong Zhao
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
    Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan
  • Kun-Yi Andrew Lin*
    Kun-Yi Andrew Lin
    Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung 402, Taiwan
    *E-mail: [email protected] . Tel: +86-(451)-86418750. Fax: +86-(451)-86413702.
  • , and 
  • Yunchen Du*
    Yunchen Du
    MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
    *E-mail: [email protected]
    More by Yunchen Du
Cite this: Environ. Sci. Technol. 2019, 53, 16, 9771–9780
Publication Date (Web):July 17, 2019
https://doi.org/10.1021/acs.est.9b03374
Copyright © 2019 American Chemical Society
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Abstract

Metal-free heterogeneous catalysts are receiving more and more attention for wastewater remediation by activating peroxymonosulfate (PMS) due to their environmental benign. However, carbon-based materials as the most typical metal-free heterogeneous always suffer from poor durability. Inspired by the fact that a conjugated system may facilitate the electron transfer during PMS activation, we innovatively select polyaniline (PANI) as a new PMS activator and investigate its catalytic performance in detail. It is found that PANI can display better catalytic performance than traditional metal-based catalysts and popular N-doped carbocatalysts in methyl orange (MO) degradation. More importantly, PANI is not only universal for various pollutants degradation but also maintains its catalytic performance in repeated degradation experiments. The stable N sites in the conjugated chains and the oxidation-resistance benzene rings as the building units are considered to be responsible for such an excellent durability. In addition, the influences of some routine factors and actual water backgrounds are comprehensively checked and analyzed. The quenching experiments and electron paramagnetic resonance confirm that MO degradation is achieved through both radical and nonradical pathways, where SO4•– and 1O2 are primary reactive species. The reaction mechanism is also proposed with the assistance of X-ray photoelectron spectroscopy.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.est.9b03374.

  • SEM image and N2 adsorption–desorption isotherm of PANI; EPR measurement with the addition of DMPO; XPS spectra and SEM image of used PANI; Raman spectra of PANI/PMS; MO degradation under Ar atmosphere; catalytic stability tests of CNTs and NCNTFs; metal leaching of Co3O4, CoFe2O4, and Co–Fe BPAs; relative parameters of Songhua River and simulated wastewater (PDF)

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