Jump to main content
Jump to site search

Issue 18, 2018
Previous Article Next Article

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

Author affiliations

Abstract

In this work, catalase-like activity of blackberry-shaped nanoparticles composed of giant {Mo72Fe30} clusters in aqueous solution under visible-light irradiation was exploited. The effects of the pH, buffer system, catalyst, H2O2 concentration, and optical conditions as well as morphology and crystallinity on the catalytic activity of the clusters were investigated. Our results under different conditions affirmed the superior catalytic activity of amorphous {Mo72Fe30} to that of its crystalline counterpart. The catalyst proved to be a visible-light-driven photocatalyst based on its narrow band gap (2.12 eV) and desired photoefficiency obtained at different wavelengths. The clusters preserved their 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. The 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. The activation energy of the reaction was found to be 58.74 kJ mol−1. A turnover frequency (TOF) of 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 non-radical mechanism for dismutation of hydrogen peroxide on the surface of the clusters was proposed.

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

Back to tab navigation

Supplementary files

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., 2018,8, 4645-4656
  •   Request permissions

    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, 8, 4645
    DOI: 10.1039/C8CY00603B

Search articles by author

Spotlight

Advertisements