Abstract
Nitrophenols has become a significant threat to the ecosystem and the health of the human beings. Photocatalytic degradation is considered to be the utmost competent approach for the amputation of nitroaromatic pollutants. In this research, 2-nitrophenol (MNP), 2,4-dinitrophenols (DNP), and 2,4,6-trinitrophenol or picric acid (PA) are taken for the degradation studies using the photo-Fenton catalyst of synthesized TiO2 nanoparticle modified with biopolymer containing organic and inorganic functionalities. The morphological study reveals the uniformly distributed TiO2 nanoparticles (15 nm) surfaces are encapsulated by the active site-rich chitosan-ligand-copper complex facilitating more absorption and enhancing the photocatalytic activity toward the target molecules. The UV spectra confirm the predominant shifting of absorption peak in the range 305–310 nm which results due to the formation of TiO2-CBGCu nanocomposites. The zeta potential of the synthesized nanocomposites TiO2-CBGCu 5%, TiO2-CBGCu 10%, and TiO2-CBGCu 20% are − 12, − 20, and − 29 mV which reveals that the value increases with the increase in CBGCu content which in turn signifies the more stability in aqueous solution. Amid the prepared nanocomposites, TiO2-CBGCu 10% demonstrates the imperative catalytic performances toward MNP, DNP, and PA pollutants along with the Fenton’s reagent at pH 3.0 under visible light and solar light. It shows effective degradation for strong acid PA within 18 min in visible light compared to MNP and DNP due to the presence of more active sites in the synthesized nanocomposites. This work has created awareness about the multifunctional catalyst and the effectiveness of the same has opened a new passage to eliminate nitrophenols from the agonized environment.
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Acknowledgements
The authors would like to thank SRM Valliammai Engineering College and Sri Sairam Institute of Technology for providing the research lab facilities. Also the authors thank the Nanotechnology Research Center, SRM IST for providing characterization facilities.
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BA contributed to synthesis of TiO2-CBGCu nanocomposites, characterization, and photocatalytic degradation of nitrophenols using combined catalysts, TiO2-CBGCu, and Fenton’s reagent. MA contributed to designing and guidance during research. CD contributed to formal analysis. NSAA contributed to characterization and validation
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Anusha, B., Anbuchezhiyan, M., Deepa, C. et al. Novel approaches to the degradation of nitrophenols using TiO2-biopolymer-ligand-metal complex as photocatalysts. J Mater Sci: Mater Electron 35, 544 (2024). https://doi.org/10.1007/s10854-024-12323-y
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DOI: https://doi.org/10.1007/s10854-024-12323-y