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Visible-light driven catalase-like activity of blackberry-shaped {Mo72Fe30} nanovesicles: combined kinetic and mechanistic studies

Abstract

In this work catalase-like activity of blackberry-shaped nanoparticles comprised of giant {Mo72Fe30} clusters in aqueous solution was exploited under visible-light irradiation. The effect of pH, buffer system, catalyst and H2O2 concentration, optical conditions as well as morphology and crystallinity on the catalytic activity of cluster was investigated. Our results at different conditions affirmed the superior catalytic activity of amorphous {Mo72Fe30} than that of crystalline counterpart. The catalyst proved to be visible-light-driven photocatalyst based on its narrow band gap (2.12 eV) and desired photoefficiency obtained at different wavelengths. The cluster preserved its integrity during treatment with hydrogen peroxide as evidenced by different spectral data as well as compositional analysis (EDS), providing efficient reusability under experimental conditions of this work. Reaction kinetic study demonstrated a first-order reaction with respect to H2O2 with a rate constant of 3×10-4 s-1 at T=298 K. Activation energy of the reaction was found to be 58.74 kJ.mol-1. A turnover frequency (TOF) 0.03 s-1 and turnover number up to ~3800 were determined for the hydrogen peroxide decomposition process under visible light. Based on scavenging experiments a nonradical mechanism for decomposition of hydrogen peroxide on the surface of clusters was proposed.

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Publication details

The article was received on 24 Mar 2018, accepted on 07 Aug 2018 and first published on 07 Aug 2018


Article type: Paper
DOI: 10.1039/C8CY00603B
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Visible-light driven catalase-like activity of blackberry-shaped {Mo72Fe30} nanovesicles: combined kinetic and mechanistic studies

    R. Mokhtari, A. Rezaeifard, M. Jafarpour and A. Farrokhi, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00603B

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