BiOBr/MoS2 catalyst as heterogenous peroxymonosulfate activator toward organic pollutant removal: Energy band alignment and mechanism insight

ZHANG, Bofan, ZHANG, Mutian, ZHANG, Liang, BINGHAM, Paul, TANAKA, Manabu, LI, Wen and KUBUKI, Shiro (2021). BiOBr/MoS2 catalyst as heterogenous peroxymonosulfate activator toward organic pollutant removal: Energy band alignment and mechanism insight. Journal of Colloid and Interface Science.

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    Abstract

    Utilization of heterogenous catalysts to trigger peroxymonosulfate (PMS) activation is considered an efficient strategy for environmental decontamination. Herein, a tightly bonded flake-like 2D/2D BiOBr/MoS2 heterojunction was successfully designed through co-precipitation process. By virtue of matched energy levels and intimate interfacial coupling, the Type-II BiOBr/MoS2 heterojunction significantly expedited charge carrier transfer and thereby promoted the catalytic performance for organic dye oxidation and Cr(VI) reduction. The specially designed BiOBr/MoS2 heterojunction is also conducive to split PMS and continuously generated highly active species (SO4∙-, ∙OH and ∙O2-) in a photo-Fenton system, achieving extraordinary catalytic capacity for various emerging organic pollutants (including phenol, bisphenol A and carbamazepine). The photoexcited electron with prolonged lifetime and exposed Mo sites with multivalence and multiphase nature can effectively activate PMS, which further promotes the oxidation efficiency of holes, as confirmed by scavenging experiments. The excellent stability and oxidative properties could justify scale up using BiOBr/MoS2 to a small pilot test, implementing the potential value in practical applications. This study would provide novel insight and cognition of PMS activation via a superior heterojunction for complex polluted wastewater treatment.

    Item Type: Article
    Uncontrolled Keywords: 02 Physical Sciences; 03 Chemical Sciences; 09 Engineering; Chemical Physics
    SWORD Depositor: Symplectic Elements
    Depositing User: Symplectic Elements
    Date Deposited: 16 Mar 2021 12:21
    Last Modified: 23 Mar 2021 11:16
    URI: http://shura.shu.ac.uk/id/eprint/28399

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