Synthesis and characterization exopolysaccharide from algae Spirulina sp. using technique sol-gel as adsorbent Pb(II) ion

Abstract

Abstract In this study, a modification of exopolysaccharide (EPS) from Spirulina sp. algae biomass with silica (HES) and exopolysaccharide from Spirulina sp. algae biomass with silica coated by magnetite particles (HESM) has been done successfully. A series of experiments with the batch method were conducted to test the ability of HESM adsorption of Pb(II) ions in solution. Identification of functional groups of HESM adsorbents was studied using infrared spectrometer (IR) while surface morphological analysis and composition of the constituent elements of HESM were performed using scanning electron microscope-energy (SEM). Concentration of Pb(II) ion in the adsorption process were analysed by inductively coupled plasma-atomic emission spectrometry (ICP-AES Adsorption of Pb(II) ions with HES and HESM is optimum at pH 7 and concentration at 25 ppm with the adsorption capacity on HES at 3.85 mg g−1 while on HESM at 272.63 mg g−1, contact time of 15 min and it tends to follow second orde pseudo kinetic model and Langmuir adsorption isotherm model.