2019 : Direct Synthesis of Sodalite from Indonesian Kaolin for Adsorption of Pb2+ Solution, Kinetic, and Isotherm Approach

Prof.Dr. Didik Prasetyoko S.Si., M.Sc.


Indonesian kaolin was used as precursor for synthesis of sodalite. Synthesis parameters were optimized by varying the Si/Al ratios, stirring and aging conditions, and water composition. X-ray diffraction, FTIR, SEM-EDX and PSA (particle size analyzer) were used to characterize sodalite. The potential of sodalite as adsorbent for heavy metal Pb 2+ ions removal from waste water was investigated in this work. The uptake adsorption capacities of sodalite was 90-100 mg/g from synthesized sodalite crystallized for 24 and 48 hours, and commercial silica. The kinetic of Pb 2+ adsorption was a pseudo second order reaction and the adsorption coefficients was followed Langmuir adsorption isotherm.