Abstract
Objective: to compare the absorption of this drug on two surfaces of Iraqi kaolin and rice husks, which are considered environmentally friendly natural products and available locally. Methods: Ciprofloxacin adsorption from an aqueous solution was studied with respect to contact time, pH, and concentration. 30 min was determined to be the equilibrium time. Increasing the drug concentration on both adsorbents increased the adsorption rate, and the data fit well into a pseudo-second-order model. The solution concentration was analysed by UV-visible spectroscopy. Then the amount of adsorption was calculated, as well as the study of the reaction kinetics for both surfaces. The rice husk adsorbent showed faster removal with higher uptake than the Kaolin clay in both SGF and SIF solutions. Results: The adsorption isotherms of type (S4, S2) were found on the surface of rice husks and kaolin clay type (L3, L4) in stomach and intestine fluids, respectively. On Iraqi kaolin clay, adsorption is well described by the pseudo-second-order model, and the Tempkin adsorption isotherm provides a good fit for the Stomach. Whereas adsorption on rice husk is well described by the Freundlich isotherm, which is a good fit for the intestine. the adsorption is predominantly physical. The best maximum adsorption capacities were calculated on both surfaces in the following order: stomach-kaolin>intestinal fluids-rice husks>stomach-rice husks>intestinal fluids-kaolin. Conclusion: Both kaolin and rice husk are possible adsorbents that could be used to get antibiotics out of water.
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