Immobilization of Chetoceros sp Microalgae with Silica Gel through Encapsulation Technique as Adsorbent of Pb Metal from Solution

Immobilization of Chetoceros sp microalgae with silica as supporting matrix has been carried out through encapsulation technique with using solution of Na2SiO3 sol. Identification of functional groups and surface morphology from adsorbent obtained was performed with utilizing infrared spectrophotometer (IR) and scanning electron microscopy (SEM). Adsorption process of Pb(II) ion on adsorbent was performed with batch method including determination of rate, capacity, and optimum pH of adsorption. Adsorption data found show that adsorption process of Pb(II) ion by Chetoceros sp biomass and Chetoceros sp-silica leans to follow pseudo first order kinetic model with each rate value (k1) of 0.032 and 0.065 min -1. Adsorption capacity (qm) of Pb(II) ion on Chetoceros sp-silica adsorbent is higher than adsorption capacity of Pb(II) ion on Chetoceros sp adsorbent without immobilization with silica.