Abstract
In the present research, ultrafine styrene–acrylonitrile copolymer nanofibers (SAN-NFs) were prepared based on the forcespinning method. The SAN solution of 10% in THF: DMF solvent mixture, a 27-gauge nozzle and a rotational speed of 5000 rpm were the optimized parameters for the preparation of SAN-NFs with an average diameter of 335 nm. The obtained nanofibers were used to adsorb uranium (U) from aqueous solutions after converting their nitrile groups to amidoxime by hydroxylamine solution (10%, w/v). For evaluating the applicability of SAN-NFs to U removal and so, the process of adsorption, the effects the initial concentration of U, solution pH and contact time were studied. The maximum adsorption of U ions was 177 mg.g−1, which was obtained under optimal conditions of pH 4 and contact time of 270 min by prepared NFs. The results showed that the proper model for equilibrium isotherm is the Langmuir model and also the kinetics of U adsorption on this adsorbent is based on the pseudo-second-order model.
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