Study on using rice-husk ash as an adsorbent for some antibiotic and anti-inflammatory drugs in aqueous

Thanh Duong Cong Nguyen, Phuong Minh Hoang, Hoang Minh Tran, Bach Dinh Dao, Hung Viet Do, Nga Thi Nguyen, Thuy Thi Nguyen

Abstract


Rice-husk ash (RHA) is prepared from a by-product of rice production. Its main component is silic dioxide. Thanks a zeolite-like structure, it could be used as an adsorbent. In this study, RHA was used to remove some antibiotic and anti-inflammatory drugs in aqueous medium such as Cefuroxim, Dexamethasone, Methylprednisolone, Prednisolon. These drugs are recommended to use at home for Covid-19 patients. The RHA has a specific surface area of 179.797 m2/g), the pore size of 63.547 m2/g, the average particle size of 3.8 mm. The zeta potential of RHA in distilled water of -42.5 V, the point of zero charge of 6.7. The main composition of elements in RHA is Si, O, C. Among investigated samples, the Cefuroxim adsorption efficiency of RHA is the best, with a adsorption capacity reached 1.43 mg.g-1 and adsorption efficiency reached 86.00 % at the optimum adsorption condition of pH solution of 7, adsorption time of 150 min, RHA weight of 0.3 g and the initial drug concentration of 5.0 mg.L-1.


Keywords


Rice-husk ash; antibiotic drug; anti-inflammatory drug; adsorption

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DOI: https://doi.org/10.51316/jca.2022.077

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