Abstract
Abstract An adsorbent Stearyl Alcohol (SA) - grafted- epichlorohydrin (E) -grafted- aminoproypyl silanetriol (APST) was synthesized, functionalized with sulfonic acid by sulfonation process [(SA-g-E)-g-APST/ SO3H]. The characterization of the adsorbent material was done using FTIR, XRD, SEM and TGA analyses. Adsorption behaviour of bovine serum albumin (BSA) was investigated using batch adsorption experiments. Adsorption efficiency was found to be extreme at pH 4.5. Kinetic studies revealed the suitability of pseudo-second-order model and adsorption equilibrium was attained within 3 h. On studying the rate limiting step, film diffusion process proved to be the best fit. Considering different isotherms, Sips isotherm model proved to be the best acceptable with a maximum adsorption capacity of 35.12 mg/g at 303 K. The favorability of the adsorption process was studied by calculating the separation factor (RL) and the results were found to be positive. Thermodynamic studies pronounce the spontaneous nature of adsorption, having maximum entropy in the system. Revival studies were done using 0.1 M Na2CO3 as the desorbing agent. The desorption experiment was carried out for over six cycles - showed the repeatability and regeneration capability of the adsorbent.
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