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Fluorescent Carbon Dots decorated MnO2 Nanorods for Complete Photomineralization of Phenol from Water.

Abstract

The enormous generation of wastewater has become the highest rated problem all over the world and day by day photocatalysis is gaining its importance as best option for its treatment. In context to recent studies for the development of photocatalyst, a novel MnO2@CQD nanocomposite (carbon dots decorated on MnO2 nanorods) was prepared by a facile one-pot hydrothermal method. The optical properties revealed an excitation edge at 540 nm and a band gap of 1.3 eV for the nanocomposite. Structural and morphological studies revealed the open-ended MnO2 nanorods (length and breadth are 510 nm and 110 nm, respectively) and the spherical CQDs are seen deposited on the surface of MnO2. The nanocomposite also possesses high surface area (95.3 m2g-1) with mesopores (diameter 39 nm) which directly influences the ionic transport. Using MnO2@CQDs the photocatalytic degradation of phenol was tested under varies operational parameters. Under optimum operational parameter, phenol degradation efficiency was found to be ~90 % with high rate constant R = 0.029 min−1. The mechanism for higher activity of MnO2@CQD nanocomposite was elucidated by different scavenger and cyclic voltammetry study. These results underline the prospective application of MnO2@CQD photocatalyst in water treatment.

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Publication details

The article was received on 14 Apr 2018, accepted on 06 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8EW00235E
Citation: Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript
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    Fluorescent Carbon Dots decorated MnO2 Nanorods for Complete Photomineralization of Phenol from Water.

    A. Mehta, A. Mishra and S. Basu, Environ. Sci.: Water Res. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8EW00235E

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