Activated carbon from Azolla for Amoxicilline adsorption: Effect of synthesize conditions using design of experiments
Volume Title: 1
Authors
1Caspian Faculty of Engineering, College of Engineering, University of Tehran
2Caspian Faculty of Engineering, College of Engineering, University of Tehran
Abstract
In this study, Azolla filiculoides were used as a raw material for the production of activated carbon to adsorb amoxicillin (AMX). Activated carbon was prepared during a Carbonization step followed by chemical activation using phosphoric acid. The effect of Carbonization temperature, chemical activation temperature (Ta), and phosphoric acid to an adsorbent ratio of adsorption yield was investigated by the full factorial designing of experiments. Analysis of variance (ANOVA) shows that by a probability more than 95%, Carbonization temperature (Tc), phosphoric acid to carbon ratio (H3PO4/C) and interaction of two factors of Tc and Ta (Tc * Ta) have a statistically significant effect on the AMX adsorption yield. The optimum conditions, including Carbonization temperature of 500℃, activation temperature of 700℃ and phosphoric acid to carbon ratio of 4 resulted in an activated carbon sample having a BET pore surface area of 940 (m2/gr) and a total pore volume of 0.49 (cm3/gr) which had the highest adsorption yield in comparison to other samples. The results show that increasing the carbonization temperature leads to a decrease in adsorption efficiency. The specimens were characterized by SEM, Nitrogen Physical Adsorption. micropore size distribution was analyzed by t-plot. About 95% of the pore surface area of the optimized sample is due to micropore (below 2 nm) and about 37% of the pore volume is for micropores volume. The results show that the azole carbon adsorbent is suitable for the absorption of drug contaminants.
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