Abstract
Abstract In this study, magnesium and aluminum ion was firstly inhaled into the silica sphere by low-vacuum impregnation technique, and subsequently hydrotalcite (Mg-Al-LDH) was synthesized inside the silica-based mesoporous material using in-hole precipitation method. Metal composite oxide (Mg-Al-LDO) was the calcined product by calcining Mg-Al-LDH at 450 °C and the composite material Mg-Al-LDO/SiO2 was the main absorbent for absorbing iodine ion (I−) in this study. The characteristics of SEM inner-morphology, FT-IR spectroscopy and X-ray diffraction strongly demonstrated hydrotalcite admirably grew in the channel of silica matrix. The influence of composite material dosage, pH values of aqueous solution, and initial concentration of I− on adsorption capacity was investigated in detail. The batch experiment results showed that Mg-Al-LDO/SiO2 had an excellent adsorption performance on I− and the removal efficiency reached 99.81% from a 30 mg/L I− solution in 5 min, with a dosage of 0.05 g/100 ml. The adsorption kinetics was fitted well by pseudo -second-order model. The column experiment data demonstrated that the application of Mg-Al-LDO/SiO2 in a column model for the continuous treatment of iodine ion effluents exhibited optimum breakthrough curves by adjusting the bed heights. The experimental breakthrough curves were correlated with Thomas, Adams–Bohart and Yoon–Nelson models.
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