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Assessment of GO/ZnO nanocomposite for solar-assisted photocatalytic degradation of industrial dye and textile effluent

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Abstract

An ecofriendly and solar light-responsive graphene oxide wrapped zinc oxide nanohybrid has been synthesized hydrothermally using lemon and honey respectively as chelating and complexing agents. By tuning the reaction conditions, a heterostructure between GO and ZnO has been formed during synthesis. The photocatalytic activity of the synthesized nanohybrid was investigated by degradation of hazardous organic textile dye (methylene blue) as well as wastewater under natural solar light. The nanohybrid exhibited excellent photocatalytic activity towards degradation (~ 89%) of methylene blue (MeB). Furthermore, along with decolorization, 71% of mineralization was also achieved. Interestingly, the nanohybrid has been found to be reusable up to 4 cycles without significant loss of photocatalytic activity. Along with this, the physicochemical parameters of the wastewater generated from textile industry have been also monitored before and after exposure to nanohybrid. The results revealed significant reduction in chemical oxygen demand (COD) (96.33%), biochemical oxygen demand (BOD) (96.23%), and total dissolved solids (TDS) (20.85%), suggesting its potential applicability in textile wastewater treatment.

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Acknowledgments

The authors are thankful to Ashok K. Chauhan, Founder President, Amity University, D. K. Avasthi, Former Director, O.P Sinha, Director, Amity Institute of Nanotechnology (AINT), and Chandradeep Tandon, Director, Amity Institute of Biotechnology (AIB), for their continued guidance. The authors are grateful to F. Singh, IUAC New Delhi, for the Raman measurements. The authors would like also to acknowledge S. N. Jha, RRCAT, Indore, for the EXAFS measurements. Our gratitude is extended to Tinku Basu, AINT, Amity University, for the FTIR studies. We are also thankful to the DST for providing the financial assistance via the project DST/TM/WTI/2K16/265.

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Correspondence to Subhasha Nigam or Monika Joshi.

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Responsible Editor: Sami Rtimi

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Sharma, M., Sondhi, H., Krishna, R. et al. Assessment of GO/ZnO nanocomposite for solar-assisted photocatalytic degradation of industrial dye and textile effluent. Environ Sci Pollut Res 27, 32076–32087 (2020). https://doi.org/10.1007/s11356-020-08849-3

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  • DOI: https://doi.org/10.1007/s11356-020-08849-3

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