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Metal free MoS2 2D sheets as peroxidase enzyme and visible-light-induced photocatalyst towards detection and reduction of Cr(VI) ion

Abstract

Two-dimensional molybdenum disulphide (MoS2) sheets were prepared by simple thermal decomposition method. The synthesized sheets were characterized by different analytical tools including FTIR, XRD, XPS, Raman spectroscopy, HRTEM and FESEM analyses. The synthesized sheets exhibited outstanding peroxidase mimic activity towards the peroxidase oxidation of chromogenic probe molecule 3,3′,5,5′-tetramethyl benzidine (TMB) produced a blue coloured solution of 3,3′,5,5′-tetramethylbenzidine diimine (TMBDI) in acidic medium (pH 4). Based on this peroxidase mimic activity it was utilized for colorimetric determination of toxic Cr(VI) ions present in aqueous medium. The MoS2 sheets showed excellent sensitivity towards Cr(VI) detection with the lower detection limit of 40.09 nM. Moreover, this 2D sheets also acted as an excellent photocatalyst because of its direct band gap of 1.90 eV, and used for the reduction of inorganic toxic pollutant Cr(VI) ions to environmentally benign Cr(III) ions under the irradiation of visible light. MoS2 sheets showed 98% photo reduction efficiency towards Cr(VI) ions within 20 min. Furthermore the synthesized MoS2 sheets was successfully recycled upto five times without significant decrease of its photocatalytic reduction efficiency towards Cr(VI) ions. The present study demonstrates that metal free MoS2 sheets prepared by simple solid state synthesis approach provides a simple, cost-effective and an easy method for determination and removal of toxic Cr(VI) ions in aqueous medium.

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Publication details

The article was received on 07 Aug 2018, accepted on 11 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ03996H
Citation: New J. Chem., 2018, Accepted Manuscript
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    Metal free MoS2 2D sheets as peroxidase enzyme and visible-light-induced photocatalyst towards detection and reduction of Cr(VI) ion

    P. Borthakur, P. K. Boruah, M. R. Das, S. B. Artemkina, P. A. Poltarak and V. E. Fedorov, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ03996H

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