Synthesis, characterization, and application of hydroxyapatite grafted over pristine charcoal /activated charcoal for removal of pb2+ ions from aqueous solution

Abstract

Hydroxyapatite (HAP) is one of the major components found in bones and teeth and has outstanding biocompatibility. Hydroxyapatite is a possible sorbent for heavy metals in contaminated water attributable to its high adsorption capabilities and solubility of water very low. However, pure hydroxyapatite is very difficult to use because it exists in the form of white power and also is too much costly. The above difficulties were overcome by the synthesis and characterization of hydroxyapatite grafted over Pristine charcoal/ activated charcoal for the expulsion of lead ions from aqueous solutions by the simple hydrothermal process at different temperatures like 120 °C and 150 °C. The result reveals that rod-like HAP nanocrystals with a range of 22––62 nm, are impregnated over charcoal. Characterization of synthesized hydroxyapatite samples by using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Field emission scanning electron microscopy (FESEM), and Energy-dispersive X-ray spectroscopy (EDX) methods. To investigate adsorbent for removal of Pb2+ from an aqueous solution of Pb (NO3)2, and to vary the adsorbent dosage to evaluate its influence on the adsorption efficiency. The observed that synthesis of HT-CH at 120 °C gives the best result, UV Analysis for the calculation of equilibrium sorption capacity of HT-CH120 and HT-ACH120 on the adsorption of Pb2+ ion is carried out by Lambert-Beer law. The equilibrium sorption capacity of HT-CH120 is 76.13 mg/gm while the equilibrium sorption capacity of HT-ACH120 is 15.8 mg/gm.