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Removal of antibiotic from aqueous solution using synthesized TiO2 nanoparticles: characteristics and mechanisms

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Abstract

We investigated the removal of cefixime antibiotic (CEF) from aqueous solution using TiO2 nanoparticles (TiO2-NPs) in the present study. The TiO2-NPs, which were successfully synthesized using sol–gel method, were characterized by X-ray diffraction, scanning electron microscopy and Fourier transformation infrared spectroscopy (FT-IR) techniques. The removal of CEF using synthesized TiO2-NPs as a photocatalyst with ultraviolet (UV) light was evaluated by the UV spectroscopic method. The optimum parameters for removal of CEF using TiO2-NPs such as contact time, pH of solution, initial concentration of CEF and dosage of TiO2-NPs were systematically studied and found to be 90 min, 6.0, 80 ppm and 0.1 mg/mL, respectively. The degradation efficiency of about 90% was achieved under the optimum conditions. Experimental kinetic results, which were fitted by the pseudo-second-order model, were much better than with pseudo-first order. The changes in surface charge of TiO2-NPs and surface functional groups were evaluated by zeta potential measurements and FT-IR, respectively. Based on UV spectroscopy, FT-IR spectroscopy and zeta potential measurements, we demonstrate that the removal mechanism of CEF is photocatalytic degradation by TiO2-NPs catalysis than adsorption of CEF onto TiO2.

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Acknowledgements

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 104.05-2016.17.

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Correspondence to Cuong Manh Vu or Tien Duc Pham.

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Dao, T.H., Tran, T.T., Nguyen, V.R. et al. Removal of antibiotic from aqueous solution using synthesized TiO2 nanoparticles: characteristics and mechanisms. Environ Earth Sci 77, 359 (2018). https://doi.org/10.1007/s12665-018-7550-z

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  • DOI: https://doi.org/10.1007/s12665-018-7550-z

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