مشخصات پژوهش

Fe3O4-chitosan nanocomposite hollow fibers were prepared via impregnation of Fe3O4nanoparticles on dry-wet spun chitosan hollow fibers (CS-HFs) and its performance in theremoval of selenium(IV) from water was investigated. The prepared nanocomposite wascharacterized using XRD, SEM and TEM analyses confirming the formation of Fe3O4nanopar-ticles throughout the heterogeneous surface of CS-HFs. Response surface methodology(RSM) was utilized to optimize Se(IV) adsorption and investigate operational parametersincluding nanocomposite amount, Se(IV) concentration, pH and contact time. The polyno-mial second order regression, which is conventionally developed in RSM for describing theprocess, did not accurately fit the experimental data owing to significant lack of fit. However,in modified polynomial third order regression, all model evaluation criteria had been con-firmed the accuracy of the developed model. The adsorption of Se(IV) on prepared Fe3O4-CSHFs followed from pseudo-second-order kinetics with participating both intraparticle andboundary layer diffusion in the rate-controlling step.