Abstract
Removal of Bisphenol A (BPA) from surface waters is necessary before consumption. A study, therefore, was conducted to degrade BPA using graphene oxide, ZnO and ZnO decorated on graphene oxide. Hydrothermal method was used to synthesize the hybrid nano-catalysts. 99.5% photocatalytic degradation of BPA was achieved by using ZG0.6 nano-catalyst in comparison to bare ZnO and GO nano-catalysts at natural pH of 7.5 in 60 min of UV irradiation. The higher photocatalytic activity of ZG0.6 nano-catalyst could be ascribed to an improved surface area, efficient charge separation as well as the decreased recombination rate of electron-hole charge carriers, leading to the generation of highly reactive hydroxyl radicals for the degradation of BPA. Photocatalytic degradation followed Langmuir-Hinshelwood model with pseudo-first-order kinetics. The degradation mechanism is also detailed with identification of reaction intermediates. Degradation pathways, based on LCMS analysis, have been proposed. The pathways revealed the formation of smaller by-products such as phenol, hydroquinol and (Z)-3-hydroxyacrylaldehyde. The developed ZG0.6 nano-catalyst were found to be reusable for consecutive five runs without much loss in the activity and have the advantage of effective charge separation.
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Acknowledgements
Authors are thankful to MRC Malaviya National Institute of Technology Jaipur and SAIF Panjab University Chandigarh for assistance in analysis of sample. One of the authors, Ms. Renuka, is thankful to Ministry of Human Resource Development (MHRD), New Delhi for providing a fellowship.
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Degradation mechanism, reaction pathways and kinetics for the mineralization of Bisphenol A using hybrid ZnO/graphene oxide nano-catalysts
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Garg, R., Gupta, R. & Bansal, A. Degradation mechanism, reaction pathways and kinetics for the mineralization of Bisphenol A using hybrid ZnO/graphene oxide nano-catalysts. Korean J. Chem. Eng. 38, 485–497 (2021). https://doi.org/10.1007/s11814-020-0718-8
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DOI: https://doi.org/10.1007/s11814-020-0718-8