Title: Adsorption of uranium(VI)on silica mesoporous material SBA-15 with short channels
Abstract: SBA-15 with short channels was employed as adsorbent for uranium ions.Different factors including contact time,initial pH value and initial concentration of solution were examined to investigate their effects on adsorption of uranium by SBA-15 with short channels.Adsorption kinetics,adsorption isotherms and changes of FT-IR spectra of SBA-15 with short channels before and after adsorption were also studied.According to the experiment,uranium adsorption on SBA-15 is strongly pH-dependent and the maximum adsorption occurs at pH of 6,the adsorption reaches equilibrium within 30 min and the maximum adsorption capacity is 311 mg·g-1 for initial solution concentration of 100 mg·L-1.Adsorption capacity increases but adsorption percentage decreases with the increase of initial uranium concentration.Adsorption isotherm follows both Langmuir and Freundlich models,and pseudo-second order rate equation is better to describe kinetic process.The Si—OH and Si—O—Si groups existing in SBA-15 are mainly responsible for the adsorption of uranium.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 4
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