IMMOBILISASI DITHIZON SECARA FISIKA PADA ZEOLIT ALAM DAN APLIKASINYA TERHADAP ADSORPSI ION LOGAM Ag(I) DAN Zn(II); PHYSICAL IMMOBILIZATION OF DITHIZONE ON NATURAL ZEOLITE AND ITS APLICATION TO ADSORP SILVER(I) AND ZINC(II)

LA RINTINGA, Mudasir

2011 | Disertasi | PROGRAM STUDI S2 KIMIA

Ag+ and Zn2+ The research consisted of the study of the adsorption of Ag ions has been done and the results were compared with those adsorbed by unmodified active natural zeolite. + and Zn2+ ions. Adsorbent characterization was performed using Infrared Spectrophotometer, X-Ray Diffraction analysis. The study of the adsorption included pH optimization, adsorption kinetic, isotherm adsorption and interaction species. The amount of Ag+ and Zn2+ The result of adsorbent characterization showed that dithizone was successfully loaded on the surface of active natural zeolite and the immobilization did not significantly damage the cristallinity of zeolite. Adsorption study suggested that the optimum condition of the adsorption of Ag ions adsorbed by two kinds of the adsorbent was determined by Atomic Adsorption Spectrophotometer. + and Zn2+ ions was at pH 6. Adsorption kinetics parameter evaluated by Langmuir-Hinshelwood equation for Ag+ ion showed that the adsorption rate constant of natural zeolite active was 1.0 x 10-3 minute-1 and that of dithizone-immobilized natural zeolite was 3.0 x 10-3 minute-1. In addition, the equilibrium constant of active natural zeolite was 8104 mol-1L and that of dithizoneimmobilized natural zeolite was 9630 mol-1L. Adsorption kinetics parameter evaluated by Langmuir-Hinshelwood equation for Zn2+ ion showed that the adsorption rate constant of natural zeolite active was 3.43 x 10-4 minute-1 and that of dithizoneimmobilized natural zeolite was 3.87 x 10-4 minute-1. In addition, the equilibrium constant of active natural zeolite was 4118 mol-1L and that of dithizone-immobilized natural zeolite was 4338 mol-1L. Isotherm adsorption parameter determined using Langmuir-Hinshelwood equation for Ag+ ion showed that adsorption capacity of dithizone-immobilized natural zeolite (1.264x10-4 mol/g) was higher then that of active natural zeolite (1.029 x 10-4 mol/g). Adsorption equilibrium constant of dithizoneimmobilized natural zeolite (8770.510 mol-1L) was higher than that of active natural zeolite (6417.437 mol-1L). In addition, the activation energy of dithizone-immobilized natural zeolite (22.494 kJ/mol) was found to be higher then that of active natural zeolite (21.720 kJ/mol). Isotherm adsorption parameter determined using Langmuir- Hinshelwood equation for Zn2+ ion showed that adsorption capacity of dithizoneimmobilized natural zeolite (6.108 x 10-5 mol/g) was higher then that of active natural zeolite (5.189 x 10-5 mol/g). Adsorption equilibrium constant of dithizone-immobilized natural zeolite (18230.512 mol-1L) was higher than that of active natural zeolite (9813.137 mol-1L). In addition, the activation energy of dithizone-immobilized natural zeolite (24.307 kJ/mol) was found to be higher then that of active natural zeolite (22.773 kJ/mol). Types of interactions that contribute to the adsorption of Ag+ and Zn2+ sequentially from the largest amount of complex formation, hydrogen ion exchange, ion exchange, and entrapment

Kata Kunci : immobilization, dithizone, zeolite, adsorption