C.S. NURA, A. CHATTREE AND R.P. SINGH
Abstract
Water is the most ubiquitous natural resource. To preserve these prodigious aquifers from contamination is a matter of utmost importance. In the present study, we studied the adsorption of Fe2+ by mixed micelles of Sodium dodecyl benzene sulphonate(SDBS) using Micellar enhanced ultrafiltration (MEUF). A polyether sulphone membrane disc of 10kDa MWCO was used to remove Fe2+ by mixed micelle of SDBS. The optimization of the system was carried out considering three operational parameters filtration time, feed Fe2+ ion concentration and shaking rate. The removal percentage of Fe(II) decreased on increasing feed Fe2+ concentration. However, on increasing the shaking rate and filtration time, the adsorption efficiency was increased. After 60 minutes SDBS+Triton X-100 and SDBS+Tween-80 achieved equilibrium and no further adsorption of Fe2+ was noticed. Equilibrium study was analysed by using three adsorption isotherms namely, Langmuir, Freundlich and Dubinin-Kaganer-Radhushkevick (DKR) Adsorption model. Langmuir model fitted well the adsorption data. DKR model revealed the energy measure of the system which suggests that the adsorbate-adsorbent interaction existed primarily via Physisorption. Thermodynamic and thermokinetic parameters ΔG°,ΔH° and ΔS°, EAct and pre-exponential factor A were evaluated. Negative value of Gibbs free energy and enthalpy suggests that the reaction is spontaneous and exothermic. Positive entropy mentions increased disorderness at the surface of mixed micelle.