Kinetics Performance for Cadmium (II) Ion Adsorption using Mesoporous Silica Embedded with Iron Oxide

Abstract

Mesoporous silica embedded with iron oxide succesfully synthesized by wet impregnation following with microwave. Resulting material have characterized by XRD, FTIR, EDX, BET and TEM. The result showed that mesoporous silica morphology is the hexagonal structure-like with surface area is 470 m 2 /g, pore volume is 0.87 cc/g and pore diameter of 6.5 nm. The interesting phenomenon showed that the amount of iron particle on surfacearea is 25.47% which has high similarity with the weight of the adding iron during preparation. The most functional group that observed by FTIR in mesoposorous silica sample are silanol Si-OH, Si-O-Si and Fe-O-Si. It was effectively used as an adsorbent for the adsorption of cadmium (II) ion. Mesoporous silica applied for cadmium ion which is carried out by cadmium solution with initial concentration was 23.97 mmol/L for 7 h at 25 o C with stirring rate 150 rpm. The optimum contact time of the adsorption capacity was reached at 80 minutes. The optimum adsorption capacity for cadmium ions was 74.25 mmol/g fitted by kinetic models Lagergren. According to these results, mesoporous silica embedded with iron oxide could be a potential material for heavy metal removal process.