Removal of Strontium (II) from Aqueous Solution by Adsorption Using Xerogel Synthesized by TEOS: Kinetics and Thermodynamics Study

Document Type : Research Article

Authors

1 Department of Chemistry, College of Science, Semnan University, Semnan, I.R. IRAN

2 Department of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan, I.R. IRAN

3 Faculty of Science, National Institute for Genetic Engineering and Biotechnology, Tehran, I.R. IRAN

Abstract

TEOS xerogel was investigated as adsorbent to removal strontium ion from aqueous solution in batch operations. Batch experiments were carried out as a function of pH, initial concentration, time, and temperature. Simple kinetic and thermodynamic models have been applied to the rate and isotherm sorption data and kinetic and thermodynamic parameters were determined. These studies were showed that the Langmuir isotherm model and pseudo-second-order kinetic model were fitted well with experimental data. The maximum capacity of the adsorbent for Sr(II) is 17 mg/g. The paper discusses the thermodynamic parameters of the adsorption (the Gibbs free energy, entropy, and enthalpy). Results demonstrate that the adsorption process was spontaneous and endothermic under natural conditions.

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