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Mechanistic evaluation of heterocyclic aromatic compounds mineralization by Cu doped ZnO photo-catalyst

Abstract

In this study, Cu doped ZnO photo-catalyst was used for the degradation of heterocyclic compounds, pyridine and quinoline. Three ZnO based photo-catalysts with different Cu (1%, 5% and 10%) doping were synthesized by precipitation method. The characterization of catalyst was done using field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Brauner Emmet Teller (BET), diffuse reflectance spectroscopy (DRS) and photo-luminescence (PL) techniques. The band gap of the pure ZnO, 1%, 5% and 10% Cu doped ZnO photo-catalysts was found to be 3.27 eV, 3.21 eV, 3.17 eV and 2.91 eV, respectively. The effects of pH, photo-catalyst dose and irradiation time were studied. At optimum conditions (5%Cu doped ZnO dose of 1.2 g/L for pyridine and 1.6 g/L for quinoline, pH=11 and time=5 h), maximum pyridine and quinoline mineralization efficiencies were found to be 92.4% and 74.3%, respectively. Mineralization process followed first-order kinetics. The in-situ formation of singlet oxygen, hydroxyl radicals and superoxide radicals was confirmed by reactive oxygen species (ROS) scavenger studies. Catalyst reusability studied showed excellent mineralization up to four consecutive cycles. Enhanced photo-catalytic mechanism was studied by comparing band structure with respect to potential of highly reactive species (•OH and O2•-). Possible mineralization pathway was proposed on the basis of intermediates i.e. detected by gas chromatography coupled with mass spectrometry (GC-MS) analysis.

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Publication details

The article was received on 18 Dec 2018, accepted on 05 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C8PP00580J
Citation: Photochem. Photobiol. Sci., 2019, Accepted Manuscript

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    Mechanistic evaluation of heterocyclic aromatic compounds mineralization by Cu doped ZnO photo-catalyst

    B. K. Mahajan, N. kumar, R. Chauhan, V. C. Srivastava and S. Gulati, Photochem. Photobiol. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C8PP00580J

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