Fahmiati Fahmiati
Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Haluoleo, Kendari

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Sintesis dan Karakterisasi Adsorben Lempung Terimpregnasi Oleh 3-merkapto-1,2,4-triazol (trzsh) Fahmiati, Fahmiati
Jurnal Progres Kimia Sains Vol 1, No 2 (2011): JPKS Open Access
Publisher : Universitas Halu Oleo

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Abstract

Impregnation of clay is one of method to increase the adsorption capacity. Synthesisand characterization of clay impregnated 3-mercapto-1,2,4-triazole (TRZSH) has beencarried out. Functional groups of clay was characterized by infrared spectrophotometry whileBET test was performed to determine its specific surface area and porosity. Results showedthat clay impregnated TRZSH comprises silanol (Si-OH), siloksan (Si-O-Si), C-N, C=N, andSH. Spesific surface area of clay impregnated TRZSH of 184.04 m2/g. Such it has porosityvolume and radius of porosity of 123.902 x 10-3 cm/g and 134.672 A, respectively.
ADSORPTION THERMODYNAMICS OF Cd(II), Ni(II), AND Mg(II) ON 3-MERCAPTO-1,2,4-TRIAZOLE IMMOBILIZED SILICA GEL Fahmiati, Fahmiati; Nuryono, Nuryono; Narsito, Narsito
Indonesian Journal of Chemistry Vol 6, No 1 (2006)
Publisher : Universitas Gadjah Mada

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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 Brunauers 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.   Keywords: adsorption, silica gel, mercapto, thermodynamics, immobilization