Abstract
Photocatalytic dye degradation is one of the simple and convenient ways to eliminate effluents produced by paper, plastic, printing, and textile industries. ZnS is one of the most investigated catalysts on which different modifications are applied. Here, PVP-assisted zinc sulfide (ZnS) nanopowder is prepared hydrothermally. The photoluminescence spectra signify the generated intermediate state which is attributed to sulfur (S) vacancy as obtained from the theoretical analysis. This defect-induced ZnS has shown excellent Rhodamine B (RhB) dye degradation of 95% in 100 min with dye sensitization effect under UV irradiation. Under visible light, the degradation of RhB is only 50% in the presence of ZnS. The sensitization of RhB in the presence of UV light signifies the generation of visible light through the intermediate states caused by S vacancy. However, to eliminate the disadvantage of photocatalysis in highly concentrated wastewater management and expense of UV source, RhB is degraded by sonocatalysis, and 70% of dye is removed within 100 min in the presence of ZnS nanopowder. Therefore, the efficient catalytic dye degradations are achieved employing the minimum amount of ZnS powder.
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Acknowledgements
This manuscript was selected from the papers presented at the 6th edition of biennial International Conference on Nanoscience and Nanotechnology (ICONN-2021).
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This manuscript is part of the special issue of selected papers from the 6th edition of biennial International Conference on Nanoscience and Nanotechnology (ICONN-2021). One of us (SG) wishes to thank the Council for Scientific and Industrial Research (CSIR) (File no: 09/096(0926)/2018-EMR-I), the Government of India, for providing her a senior research fellowship through “CSIR-SRF”, while (MS) (DST/INSPIRE Fellowship/2017/IF170868) wishes to thank the Department of Science and Technology (DST), the Govt. of India for awarding her a DST-INSPIRE’ research fellowship. SS wishes to acknowledge and thank the Science and Engineering Research Board (SERB), a statutory body of Department of Science and Technology (DST), Government of India (File No. EEQ/2018/001127) for providing financial support. The authors wish to acknowledge the University Grants Commission (UGC), the Govt. of India for the support under the “University with Potential for Excellence (UPE-II)” scheme.
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Ghosh, S., Samanta, M., Sen, D. et al. Photocatalytic and sonocatalytic dye degradation by sulfur vacancy rich ZnS nanopowder. J Nanopart Res 23, 160 (2021). https://doi.org/10.1007/s11051-021-05283-5
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DOI: https://doi.org/10.1007/s11051-021-05283-5