Adsorption Cd(II) by Zeolite from Bottom Ash Modified by Dithizone
Abdullah Faqih, Khamidinal, Didik Krisdiyanto* dan Susy Yunita Prabawati
Program Studi Kimia, UIN Sunan Kalijaga Yogyakarta,
Jl. Marsda adisucipto No.1 Yogyakarta 55281
The aims of this research are to synthesis zeolite derived from bottom ash of coal using hydrothermal reaction and modiffied by dithizhone to apply an adsorbent of Cd2+ to study the equilibrium, kinetic and thermodynamic. The result using X-ray Diffraction (XRD) showed that zeolit X, zeolit A, zeolit Sodalit, zeolit Na-P, has been formed. Zeolite product showed specific IR absorption zeolite at wavenumber 300-1250 cm-1and zeolite modified dithizone showed absorption –NH and –SH at wavenumber 1496,76 and 2461,17 cm-1. The results SAA showed that with addition dithizone lowering the specific surface area of zeolite from 160,262 m²/g to 69,609 m²/g. The adsorption kinetics based on the pseudo-second-order rate equation indicates that the rate limiting step involving achemical reaction. The adsorption rate constants for zeolite synthesis -0,97g/mg.min-1 and for the zeolite modified dithizone 0,0291 g/mg.min-1. Based on the Langmuir equation, the maximum adsorption capacity (qmax) synthetic zeolite 1,19 mg/g and zeolite modified dhitizone 2,35 mol/g.