Abstract
Cu-doped TiO2 (0.1, 0.25, and 0.5% Cu-TiO2) photocatalyst was prepared by sol–gel method and was characterized by powder XRD, FTIR, TEM, SEM, EDX, UV–vis diffuse reflectance (DRS), photoluminescence (PL), and Raman spectroscopy. The XRD spectrum shows tetragonal anatase phase. TEM analysis indicate that the nanoparticles were spherical with sizes 12–13 nm. The degradation of NB was studied, and an optimal degradation time of 180 min led to 98.6% NB abatement of NB = 0.05 mM, pH = 4, and catalyst loading = 50 mg/100 mL, under visible light. The degradation of NB follows the pseudo-first-order kinetics. The reusability studies indicated the excellent stability of 0.25% Cu-TiO2.
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Acknowledgements
Authors are grateful to the National University of Sciences and Technology for funding and providing all the required facilities to carry out the project.
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Tehmina Akhtar: conceptualization, investigation, visualization, writing (original draft), and writing (review and editing)
Habib Nasir: conceptualization, supervision, and project administration
Effat Sitara and Syeda Aqsa Batool Bukhari: methodology and mechanism analysis
Sharif Ullah and Rana Muhammad Arslan Iqbal: formal analysis and investigation
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Highlights
• Pristine and copper-doped TiO2 (0.1, 0.25, and 0.5% Cu-TiO2) photocatalysts were prepared by the sol–gel method.
• The bandgap was reduced, and absorption was enhanced by Cu ions
• 0.25% copper-doped TiO2 (0.25% Cu-TiO2) has less e− and h+ recombination rate.
• Nitrobenzene (NB) is a carcinogenic pollutant extensively used in industry and poses a serious threat to human health and the environment.
• The synthesized photocatalyst and 0.25% copper-doped TiO2 efficiently degrade the nitrobenzene (98.68%) in 180 min under visible light.
Responsible Editor: Sami Rtimi
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Akhtar, T., Nasir, H., Sitara, E. et al. Efficient photocatalytic degradation of nitrobenzene by copper-doped TiO2: kinetic study, degradation pathway, and mechanism. Environ Sci Pollut Res 29, 49925–49936 (2022). https://doi.org/10.1007/s11356-022-19422-5
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DOI: https://doi.org/10.1007/s11356-022-19422-5