Abstract
AbstractThe removal of Congo red dye from an aqueous solution using perlite, a volcanic siliceous rock, as a low cost adsorbent was studied. Adsorption experiments were carried out as batch studies at different adsorbent dose, pH, temperature and initial dye concentration. The dye adsorption equilibrium was rapidly attained after 40 min of contact time. The adsorbent was characterized by Fourier Transform Infrared spectroscopy (FTIR), X‐ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Langmuir and Freundlich isotherms were studied for the adsorption data over a concentration range of 20 to 100 mg/L. The thermodynamic parameters such as entropy of adsorption (ΔS0), enthalpy of adsorption (ΔH0) and Gibbs free energy of adsorption (ΔG0) were obtained and analyzed. Kinetic studies showed that the adsorption process obeyed the pseudo first order kinetic model. The dimensionless separation factors (RL) showed that perlite could be used to remove Congo red from an aqueous solution.
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