KINETICS AND EQUILIBRIUM MODEL OF Pb(II) AND Cd(II) ADSORPTION ONTO TETRAKIS-THIOMETHYL-C-4-METHOXYPHENYLCALIX[4]RESORCINARENE

Utomo, Suryadi Budi and Jumina, and Siswanta, Dwi and Mustofa, (2012) KINETICS AND EQUILIBRIUM MODEL OF Pb(II) AND Cd(II) ADSORPTION ONTO TETRAKIS-THIOMETHYL-C-4-METHOXYPHENYLCALIX[4]RESORCINARENE. Indo. J. Chem. pp. 49-56.

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    Abstract

    The ability of tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene for trapping Pb(II) and Cd(II) from aqueous solution at different pH, contact times, and initial metal concentration was investigated. Concentration of metal ions before and after interaction was analyzed by Atomic Absorption Spectrophotometer (AAS). The result indicated that tetrakis-thiomethyl-C-4-methoxyphenylcalix[4]resorcinarene is a good host for metal ions, where Cd(II) sorption capacity was higher than that of Pb(II). Effect of pH on batch experiments for the mentioned ions indicated that the optimum pH for metal binding were 5 for both of lead(II) and cadmium(II). In order to investigate the mechanism of adsorption, the 1st-order, pseudo 1st-order, and pseudo 2nd-order kinetic models were used. The adsorption model of metal ions on the resorcinarene followed pseudo second order of Ho & McKay expression. The equilibrium adsorption isotherm has been analyzed by Langmuir and Freundlich equations. Langmuir model had the higher correlation coefficient than that of Freundlich model. Uji kemampuan tetrakis-tiometil-C-4-metoksifenilkaliks[4]resorsinarena untuk menjebak Pb(II) dan Cd(II) telah dilakukan pada berbagai variasi pH, waktu kontak dan konsentrasi larutan logam. Konsentrasi ion logam sebelum dan sesudah interaksi dianalisis dengan Spektrofotometer Serapan Atom (SSA). Hasil penelitian menunjukkan bahwa tetrakis-tiometil-C-4-metoksifenilkaliks[4]resorsinarena memiliki daya adsorpsi tinggi terhadap kedua logam tersebut dimana kapasitas penyerapan Cd(II) lebih tinggi daripada Pb(II). Pengaruh tingkat keasamaan pada percobaan batch untuk ion-ion tersebut menunjukkan bahwa adsorpsi optimum terjadi pada pH 5 baik untuk timbal(II) maupun kadmium(II). Dalam rangka mempelajari mekanisme adsorpsi yang terjadi digunakan pendekatan model kinetika reaksi orde kesatu, pseudo orde kesatu, dan pseudo orde kedua. Model adsorpsi ion logam pada resorsinarena tersebut mengikuti reaksi pseudo orde kedua Ho dan McKay. Kesetimbangan adsorpsi isoterm dianalisis dengan persamaan Langmuir dan Freundlich. Model Langmuir memiliki koefisien korelasi lebih tinggi dari model Freundlich.

    Item Type: Article
    Subjects: Q Science > QD Chemistry
    Divisions: Fakultas Keguruan dan Ilmu Pendidikan > Pendidikan Kimia
    Depositing User: Arissa Aprilia Nurcahyani
    Date Deposited: 15 Apr 2014 01:26
    Last Modified: 15 Apr 2014 01:26
    URI: https://eprints.uns.ac.id/id/eprint/11028

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