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  • Efficient pyrite activating persulfate process for degradation of p-chloroaniline in aqueous systems: A mechanistic study

    Author(s)
    Zhang, Y
    Tran, HP
    Du, X
    Hussain, I
    Huang, S
    Zhou, S
    Wen, W
    Griffith University Author(s)
    Wen, William Y.
    Year published
    2017
    Metadata
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    Abstract
    In recent years, persulfate activation systems have received increasing attention due to their high oxidation reactivity when removing environmental pollutants. Pyrite, the most common metal sulfide on Earth’s surface, can supply abundant Fe2+ for persulfate activation. The role of the generated reactive oxygen species (ROS) in persulfate-pyrite systems however, is not fully understood. In this study, batch experiments were used to investigate p-chloroaniline (PCA) degradation by a pyrite-persulfate system. The effects of pyrite dosage, pH, temperature, air conditions (aerobic vs. anaerobic) and pyrite particle size on PCA ...
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    In recent years, persulfate activation systems have received increasing attention due to their high oxidation reactivity when removing environmental pollutants. Pyrite, the most common metal sulfide on Earth’s surface, can supply abundant Fe2+ for persulfate activation. The role of the generated reactive oxygen species (ROS) in persulfate-pyrite systems however, is not fully understood. In this study, batch experiments were used to investigate p-chloroaniline (PCA) degradation by a pyrite-persulfate system. The effects of pyrite dosage, pH, temperature, air conditions (aerobic vs. anaerobic) and pyrite particle size on PCA degradation were examined. Radical detection was conducted using electron paramagnetic resonance (EPR) methods. Results from the EPR spectra indicated that PCA degradation was achieved by sulfate radical and hydroxyl radical oxidation. Aerobic conditions were more beneficial to PCA degradation than anaerobic conditions due to the generated superoxide radicals (O2radical dot−) that activated the persulfate to produce more sulfate radicals (SO4radical dot−). PCA degradation also increased with higher pyrite doses and under acidic conditions (pH 3.0 and 5.0). PCA was removed completely at pH 3.0 after 60 min. Temperature increase from 10 to 50 °C significantly promoted PCA degradation. These findings provide new understanding of the mechanism involved in pyrite activation of persulfate which can be used to improve PCA degradation by pyrite-persulfate systems.
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    Journal Title
    Chemical Engineering Journal
    Volume
    308
    DOI
    https://doi.org/10.1016/j.cej.2016.09.104
    Subject
    Chemical engineering
    Chemical engineering not elsewhere classified
    Civil engineering
    Environmental engineering
    Publication URI
    http://hdl.handle.net/10072/341626
    Collection
    • Journal articles

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