Synthesis of Novel Core-Shell Structured Hydroxyapatite/Meso-Silica for Removal of Methylene Blue from Aqueous Solutions

摘要

Core-shell structured hydroxyapatite(HA)/meso-silica was prepared and used as absorbance of methylene blue (MB).HA/meso-silica was synthesized in three steps: preparation of nano-sized HA by wet precipitation method,coating of dense silica and deposition of meso-silica shell on HA.As-received samples were characterized by Fourier transformed infare spectra,small angle X-ray diffraction,nitrogen adsorption-desorption isotherm and transmission electron microscopy.A wormhole framework mesostructure was found for HA/meso-silica.The specific surface area and pore volume were 128 m2 μg1 and 0.36 cm3 μg-1,respectively.From the adsorption isotherm,HA/meso-silica with the great specific surface area exhibited a prominent adsorption capacity of MB(134.0 mg/g)in comparison with bare HA(0 mg/g).This study might shed light on surface modification of conventional low-cost adsorbents for removal of organic pollutants from aqueous solutions.