Abstract
Nano TiO2 was synthesized and characterized by common analytical techniques. From the analysis, it is observed that HRTEM shows a particle size of 23 nm and crystallinity of a synthesized sample. The photocatalytic degradation of nitrophenols (4-nitrophenol, 2,4-dinitrophenol and 2,4,6-trinitrophenol [picric acid]) with TiO2 coupled with Fenton reagent [Fe2+/H2O2] is studied using UV light (Wavelengths 254, 365 and 390 nm), visible and sunlight at different pHs (3, 7 and 10). The experimental results confirmed that pH 3 is the optimum value for the effective degradation of all the three nitrophenol compounds. At pH 3, the degradation of nitrophenols separately with TiO2 and Fenton reagent is studied under the UV light with the wavelength of 254 nm. The results obtained are compared and it is observed that the photocatalytic degradation of nitrophenols in the presence of TiO2 combined with Fenton reagents shows higher activity than that of the pure TiO2 nanoparticles. The optimum pH value (pH 3), FeSO4⋅7H2O concentration (1 mM), H2O2 concentration (20 mM), catalyst dosage (50 mg/L) lead to the complete degradation of all the three nitrophenols (4-nitrophenol, 2,4-dinitrophenol and 2,4,6-trinitrophenol [picric acid]) of concentration 200 mg/L within the time period of 12 min, 15 min and 15 min, respectively, under the UV light of wavelength 254 nm.
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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 analytical support.
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Anusha, B., Anbuchezhiyan, M. & Sribalan, R. An efficient photocatalytic degradation of nitrophenols using TiO2 as a heterogeneous photo-Fenton catalyst. Reac Kinet Mech Cat 134, 501–515 (2021). https://doi.org/10.1007/s11144-021-02064-y
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DOI: https://doi.org/10.1007/s11144-021-02064-y