THERMODYNAMIC OF Mg(II), Cd(II), AND Ni(II) ADSORPTION ON SULFONIC MODIFIED SILICA GEL

Choiril Azmiyawati; Nuryono Nuryono; Narsito Narsito

doi:10.22146/ijc.21835

THERMODYNAMIC OF Mg(II), Cd(II), AND Ni(II) ADSORPTION ON SULFONIC MODIFIED SILICA GEL

https://doi.org/10.22146/ijc.21835

Choiril Azmiyawati^(1*), Nuryono Nuryono⁽²⁾, Narsito Narsito⁽³⁾

(1) Chemistry Department, Faculty of Mathematics and Natural Sciences University of Diponegoro, Semarang
(2) Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta
(3) Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta
(*) Corresponding Author

Abstract

Silica gel modified with 4-amino-5-hydroxy-2,7-naphtalenedisulphonate (SG-SO₃^-) has been applied for adsorption of Mg(II), Cd(II), and Ni(II) in aqueous medium. In addition, three thermodynamic parameters i.e. capacity, adsorption constant and energy of adsorption were calculated. Adsorption was conducted in a batch system and metal ion remaining in the solution was determined by atomic adsorption spectrophotometry (AAS). The amount of adsorbed metal ions was calculated from the difference of metal ion concentration before and after interaction. Adsorption parameters i.e. capacity (n^s₂), constant (b), and energy (E) of adsorption were calculated using the equation of Langmuir isotherm. Results showed that n^s₂for Mg(II), Cd(II), and Ni(II) on the adsorbent were 4.67 x 10^-4, 1.19 x 10^-4, and 0.13 x 10^-4mol g^-1, respectively. The values of b for Mg(II), Cd(II), and Ni(II) were 49.35 x 10⁵, 173.46 x 10⁵, and 181.12 x 10⁵g^-1, respectively. Furthermore, it was found that E for all metal ion investigated was in the range of 26-30 kJ/mol, indicating the involvement of chemical adsorption.

Keywords

adsorption; selectivity; silica gel; modification

Full Text:

Full Text PDF

References

[1] Maquleira A., Elmahadi H.A.M., dan R. Puchades, 1994, Anal. Chem., 66, 3632-3638

[2] Jin, X., G.W. Bailey, Y.S. Yu, dan A.T. Lynch, 1996, Soil Science, 161(8), 509-520

[3] Nuryono, E.S. Kunarti, dan Narsito, 2000, Jurnal Kimia Sains dan Aplikasi, III(2), 41 –51

[4] Scott, R.P.W., 1993, Silica Gel and Bonded Phases: Their Production, Properties and Use in LC, John Wiley & Sons, Toronto

[5] Price, P.M., Clark, J.H., and Macquarrie, D.J., 2000, J. Chem. Dalton Trans., 101-110

[6] Ghoul, M., Bacquet, M., dan Morcellet, M., 2003, Water Research, 37, 729-734

[7] Tokman, N., Akman, S., dan Ozcan, M., 2003, Talanta, 59, 201-205

[8] Fahmiati, Nuryono dan Narsito, 2004, Alchemy, 3(2) 22-28

[9] Adamson, A. W., 1990, Physical Chemistry of Surface, Fifth edition, John Wiley & sons, Inc., New York, pp 609, 423-424

[10] Huheey, J.E., Keiter, E.A., dan Keiter, R.L., 1990, Inorganic Chemistry: Principles of Structure and Reactivity, 4^th ed., Harper Collins College Publishers, New York, pp. 114-117

DOI: https://doi.org/10.22146/ijc.21835