Application of Experimental Design Methodology to Optimize Azithromycin Removal by Graphene/Iron Oxide Nanocomposite
The pH had the highest effect on Azithromycin removal
DOI:
https://doi.org/10.1071/ejmbs.v3i1.30Keywords:
Azithromycin dihydrate, Graphene/Fe2O3 nanocomposite, Kinetics, Thermodynamics parametersAbstract
Currently, the occurrence and fate of antibiotics in the aquatic environment has become a very serious problem in that they can potentially and irreversibly damage the ecosystem and human health. For this reason, interest has increased in developing strategies to remove antibiotics from water. In this study, we report the several adsorption parameters including the adsorbent dosage, the initial azithromycin concentration, contact time, temperature, and pH were studied. The maximum adsorption Qmax. (9.89 mg g-1) was obtained after shaking the mixture for 30 min, at 298 K, and at neutral pH. The adsorption isotherm was analyzed by different isotherm models. The Langmuir and Freundlich isotherm models were found fitted to data well. The adsorption process follows second-order pseudo kinetics. The adsorption was endothermic (∆H◦= 39.64 kJ/mol), effective (∆S◦ = 174 kJ/mol·K) and spontaneous (∆G◦ = −15 KJ/mol). Overall, the findings in this study confirm that Graphene/Fe2O3 is a feasible and viable option for removing azithromycin from water in terms of water quality improvement and urgent antibiotics pollution control.
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