Adsorption Behaviors of Aqueous Lead Ions by Amine-functionalized Mesoporous Silica SBA-15

Abstract

The amidoxime mesoporous silica (AO-SBA-15) was prepared as the adsorbent and the effects of acidity, reaction time and initial concentration on the adsorption of lead ion were studied. The results show that AO-SBA-15 has a good adsorption performance for lead ion at pH values in the range of 4~6. The adsorption capacity increases with the increase of the initial lead ion concentration. AO-SBA-15 has higher adsorption capacity for lead ion of about 0.80 mmol·g-1. The adsorption process of lead ion shows that electrostatic and covalent complex have certain effect on the adsorption of lead ion.