| Abstract |
Hydroxyapatite (HAP) and hydroxyapatite/activated carbon (HAP/AC) composites were successfully synthesized via a simple route. The surface area of HAP1, HAP2, HAP/AC1, HAP/AC2 and HAP/AC3 were found to be 3.05, 30.68, 296.41, 920.51 and 274.76 m2 g−1, respectively. Moreover, their adsorptions of two drugs by HAP/AC2, paracetamol and ofloxacin, in aqueous solution followed the Freundlich and Langmuir isotherm, respectively. The adsorption kinetic was fitted well with the Pseudo-second order model. Among all studied adsorbents, we found that HAP/AC2 was the best adsorbent, showing the paracetamol removal efficiency of 94.59 % with the adsorption capacity of 37.84 mg g−1 and the ofloxacin removal efficiency of 99.18 % with the equilibrium capacity of 39.67 mg g−1. The key interaction between adsorbates and adsorbent was suggested to be the H-bonding since HAP/AC2 showed higher the equilibrium adsorption capacity of ofloxacin than that of paracetamol. This result may be the effect of the H-bonding and active sites of ofloxacin, which are more available than that of paracetamol. The pH has a role on the removal efficiency of drugs therefore, the interaction was also supposed as the electrostatic force. |
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