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Vol. 37 No. 2 (2025): Vol 37 Issue 2, 2025

Copyright (c) 2025 SUNIL JOSE THERATTIL, DINOOP LAL, Rajesh, Anju Rose, Rijoy K J, Savitha Unnikrishnan

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Modified Graphene Oxide-Zinc Oxide Assisted Accelerated Photodegradation of Polystyrene under Ultraviolet Irradiation

https://doi.org/10.14233/ajchem.2025.33206
S. Dinoop Lal
Department of Chemistry, St. Thomas College, Thrissur-680001, India
https://orcid.org/0000-0002-0136-3730
T. Sunil Jose
Department of Chemistry, St. Thomas College, Thrissur-680001, India
https://orcid.org/0000-0002-4690-1248
C. Rajesh
Department of Chemistry, MES Kalladi College, Palakkad-678583, India
P. Anju Rose Puthukkara
Department of Chemistry, St. Thomas College, Thrissur-680001, India
https://orcid.org/0000-0003-3325-0180
K.J. Rijoy
Department of Chemistry, St. Thomas College, Thrissur-680001, India
https://orcid.org/0009-0006-7013-6888
K. Savitha Unnikrishnan
Department of Chemistry, St. Thomas College, Thrissur-680001, India

Corresponding Author(s) : T. Sunil Jose

suniljosestc@gmail.com

Asian Journal of Chemistry, Vol. 37 No. 2 (2025): Vol 37 Issue 2, 2025

Abstract

In this work, the photodegradation of polystyrene (PS) was investigated using modified graphene oxide-zinc oxide (ZnO-GO) photocatalyst under ultraviolet radiation. The optical band gap energy of ZnO decreased in ZnO-GO composites. Photodegradation of PS, PS-ZnO and PS-ZnO-GO composites were studied under artificial UV radiation. PS-ZnO-GO composites underwent superior chain scission compared to PS-ZnO and pristine PS, upon UV exposure, as evident from gel permeation chromatography (GPC). FTIR spectra revealed the existence of strong chemical interaction between ZnO and GO in the prepared composites. Moreover, FTIR spectroscopy substantiated the occurrence of photo-oxidation in PS chains upon UV exposure. The decrease in the mechanical properties, dielectric breakdown voltage and thermal stability the irradiated specimens demonstrating the spread of degradation of PS chain to the inner matrix from the surface. Considering the results of all the analysis techniques, it was evident that PS-ZnO-GO composites underwent superior photodegradation compared to PS-ZnO and pristine PS. A possible mechanism of degradation was also proposed.

Keywords

Zinc oxide Graphene oxide Hydrothermal method Photodegradation Dielectric breakdown Mechanical properties
Lal, S. D., Jose, T. S., Rajesh, C., Puthukkara, P. A. R., Rijoy, K., & Unnikrishnan, K. S. (2025). Modified Graphene Oxide-Zinc Oxide Assisted Accelerated Photodegradation of Polystyrene under Ultraviolet Irradiation. Asian Journal of Chemistry, 37(2), 485–497. https://doi.org/10.14233/ajchem.2025.33206
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