Kesetimbangan Adsorpsi Optional Campuran Biner Cd(II) dan Cr(III) dengan Zeolit Alam Terimpregnasi 2-merkaptobenzotiazol

ABSTRACT

Natural zeolite is one of adsorbents widely used in adsorption processes to treat water polution caused by heavy metal waste. In some cases, the modification of the zeolit active surface is important to improve its adsorpability and its selectivity. Characteristic of modified natural zeolite can be obtained from the analysis of adsorption equilibrium data which useful for adsorption process design. The aim of the research is to find and analyzing the adsorption equilibrium data for binary mixture adsorption process of Cd and Cr metals using the modified natural zeolite which impregnated with 2-metrcaptobenzotiazole (zeolite-MBT). The adsorption equilibrium experiments were carried out in a flask batch method using a shaker bath with experimental temperatures were varied from 27°C to 50°C. An amount of 0.1 gram of zeolite-MBT adsorbent was immersed in 60 ml of Cd and or Cr solution then shook until the equilibrium condition (6 hours) was reached. The quantity of metal ionic adsorbed was measured through the concentration of metal solution at equilibrium condition. Each series of equilibrium data were obtained by varying the initial solution concentration in such a way that they could be ploted to create the adsorption isotherm curve. The Langmuir competitif model was used to draw the adsorption isotherm curve for the binary mixture of Cd and Cr by zeolit-MBT adsorbent. The smallest relative mean error correction, i.e. 12.9% and 23 % for Cd and Cr adsorption respectively. Separation performance in the adsorption process of Cd and Cr by the zeolit-MBT adsorbent is five to eight times better than the zeolit-Na adsorbent that wide commercially being used.

Keywords: adsorption, impregnation, zeolite-MBT

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