Thermodynamics and Kinetics of Adoption of Ag (I) on Paramagnetic Silica Rice Husk Ash Surface

Abstract

Synthesis of paramagnetic silica from rice husk ash has been carried out as an adsorbent for heavy metal Ag (I). This study tried to synthesis and characterized the thermodynamics and kinetics behaviour of paramagnetic silica from the husk ash as metal adsorbent Ag (I). Determination of optimal conditions for adsorption of metal ions Ag (I) is carried out by varying the pH, concentration, and contact time of the adsorbent. The results showed that the optimum pH was at pH 3, optimal concentration Ag(I) of 350 ppm and optimal contact time of 90 minutes. At optimal conditions, paramagnetic silica adsorption capacity for metal ion Ag (I) is 323.62 mg/g. The isotherm model that is suitable for paramagnetic silica is the Freundlich isotherm model. The kinetic model that is suitable for paramagnetic silica is the Pseudo Order 2 kinetic model.

Synthesis of Rice Husk Mesoporous Silica as pH Responsive Release Material

“…The husk ash that has been formed was then crushed and sieved. The making of Na2SiO3 from rice husk ash in this study followed the procedure carried out by our previous study [11][12]. A total of 20 g of rice husk ash sample was added with 200 mL of 4 M NaOH, then heated to boiling while stirring with a magnetic stirrer.…”