Synthesis, characterization, and kinetic studies of multifunctionalized mesoporous silica for adsorption of zinc

Abstract

The aim of this study is to evaluate the utilization of bifunctional mesoporous silica with a platinum andpropylsulfonic acid group (Pt/SBA15-PrSO3 H) as an adsorbent for the removal of Zn(II) ions from aqueous solutions.The SBA15-functionalized organosulfonic acid material was synthesized with a one-step cocondensation synthesis route.The second step was Pt loading during reduction and deposition into the aqueous suspension of the bifunctionalmesoporous silica synthesized by an aqueous solution of formaldehyde as the reducing agent. The propylsulfonic acid andplatinum functionalized mesoporous silica were characterized by BET, thermogravimetric analysis, and X-ray diffractionmethods. The adsorption properties and thermodynamic parameters of the bifunctional mesoporous silica synthesizedto adsorb Zn(II) ions were studied. The effects of pH, initial concentration, temperature, adsorption equilibrium, andadsorption kinetics on the adsorption of zinc were investigated using the synthesized bifunctional mesoporous silica.