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Article | Volume 4, ISSUE 6 , P1359-1372, June 14, 2018
Metal Sulfides as Excellent Co-catalysts for H2O2 Decomposition in Advanced Oxidation Processes

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Published:April 12, 2018 DOI:https://doi.org/10.1016/j.chempr.2018.03.002

    Highlights

    • Use of metal sulfides as co-catalysts for improving the efficiency of AOPs
    • Catalytic processes reduce the cost to 0.4%–1.3% of conventional AOPs
    • Co-catalytic effect of the exposed Mo 4+ on the surface of MoS 2 determines the AOPs
    • Co-catalytic effect of metal sulfides greatly enhances the practical application of AOPs

    Summary

    Advanced oxidation processes (AOPs) are widely proposed for treating persistent pollutants by the OH radicals generated from H 2O 2 decomposition. However, their broad applications in practical settings have been hampered by the low efficiency of H 2O 2 decomposition. Here, we report that metal sulfides (MoS 2, WS 2, Cr 2S 3, CoS 2, PbS, or ZnS) can serve as excellent co-catalysts to greatly increase the efficiency of H 2O 2 decomposition and significantly decrease the required dosage of H 2O 2 and Fe 2+ in AOPs. Unsaturated S atoms on the surface of metal sulfides can capture protons to form H 2S and expose metallic active sites with reductive properties to accelerate the rate-limiting step of Fe 3+/Fe 2+ conversion. The efficiency of AOPs involving co-catalysts can be further enhanced by visible-light illumination thanks to the sensitization of organic pollutants. This discovery is expected to drive great advances in the use of AOPs for large-scale practical applications such as environmental remediation.
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