Adsorption characteristics of amoxicillin antibiotic on CeO2-coated SiO2 nanomaterials

Thi Mai Anh Le; Thi My Quynh Pham; The Dung Nguyen; Tien Duc Pham

doi:10.51316/jca.2020.079

Authors

Thi Mai Anh Le Faculty of Chemistry, University of Science, Vietnam National University – Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam Author
Thi My Quynh Pham Faculty of Chemistry, University of Science, Vietnam National University – Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam Author
The Dung Nguyen Faculty of Chemistry, University of Science, Vietnam National University – Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam Author
Tien Duc Pham Faculty of Chemistry, University of Science, Vietnam National University – Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi 100000, Vietnam Author

DOI:

https://doi.org/10.51316/jca.2020.079

Keywords:

Adsorption, CeO2-coated SiO2, Nanomaterials, Amoxicillin, Rice husk

Abstract

This study investigated adsorption of beta-lactam antibiotic Amoxicillin (AMX) on a new material of cerium oxide-coated nanosilica (CeO₂-coated SiO₂). The CeO₂-coated SiO₂ based on rice husk, was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Adsorption behaviors of AMX on CeO₂-coated SiO₂ at different pH and ionic strength were thoroughly studied. The highest removal of AMX using CeO₂-coated SiO₂ reached 99.26 % at pH 4 while the maximum adsorption capacity was found to be greater than 11.0 mg/g. Adsorption isotherms of AMX on CeO₂-coated SiO₂ at different ionic strength were in accordance with Freundlich model. Adsorption of amphoteric AMX species on CeO₂-coated SiO₂ increased with a decrease of salt concentration indicating that adsorption was controlled by both electrostatic and non-electrostatic interactions.

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