Preparation, characterization and lead sorption performance of alginate-SBA-15 composite as a novel adsorbent

Alginate-sba-15 (alg-sba-15) was synthesized by encapsulation of the nanoporous sba-15 in the biopolymeric matrix of calcium alginate. this adsorbent was characterized using powderx-ray diffraction (xrd), scanning electron microscopy (sem), nitrogen adsorption-desorption andfourier transform infrared (ft-ir) spectroscopy. tests were then conducted to study the adsorption oflead ions onto alg-sba-15 from an aqueous solution for the effect of ph, contact time and temperaturein batch systems. freundlich and langmuir models were used for a mathematics description of theadsorption isotherm. the equilibrium process was described well by the langmuir isotherm model withthe maximum sorption capacity of 222:22 mg g??1 of lead on alg-sba-15. the kinetics analysis revealedthat the overall adsorption process was successfully fitted with the pseudo-second-order kinetic model.the values of calculated thermodynamic parameters (
g,
h and
s) indicated the endothermicand spontaneous nature of adsorption. all the results validated the feasibility of alg-sba-15 for highlyeffective removal of lead from an aqueous solution.