Termodinamika Adsorpsi Cd(II), Ni(II) dan Mg(II) pada Silika Gel yang Terimobilisasi dengan 3-Merkapto-1,2,4-triasol
ABSTRACT: Thermodynamics
study of Cd(II), Ni(II), and Mg(II) adsorption on silica gel immobilized with
3-mercapto-1,2,4-triazole (SG-SH) has been carried out. Three thermodynamic
parameters namely adsorption capacity, equilibrium constant and adsorption
energy were determined using model of Langmuir adsorption isotherm. Process of
adsorption was carried out by mixing metal ion solution in various
concentrations (5 - 400 mg/L) with adsorbent in a batch system. The un-adsorbed
ions were determined by Atomic Absorption Spectrophotometry (AAS) and the
adsorbed ions were differences of ion concentration in solution before and
after adsorption process. Parameters of thermodynamics i.e. capacity (a),
equilibrium constant (K) and adsorption energy were determined by using the
correlation curve of ratio of equilibrium concentration to the amount of
adsorbed metal ions versus equilibrium concentration. Results showed that
adsorption of metal ions Ni(II), Cd(II) and Mg(II) on adsorbent of silica gel
immobilized with mercapto groups tend to follow Type I (monolayer) of
Brunauer's classification. Evaluation of thermodynamic adsorption showed that
the order of adsorption capacity was Ni(II) < Cd(II) < Mg(II) with
relatively low energy adsorption, in a range
of 12 - 18 kJ/mole.
Penulis: Fahmiati, Nuryono, Narsito
Kode Jurnal: jpkimiadd060054
