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Functionalized magnetic iron oxide/polyacrylonitrile composite electrospun fibers as effective chromium (VI) adsorbents for water purification

Zhao, Rui, Li, Xiang, Li, Yumei, Li, Yanzi, Sun, Bolun, Zhang, Nan, Chao, Shen, Wang, Ce
Journal of colloid and interface science 2017 v.505 pp. 1018-1030
adsorbents, adsorption, chromium, filtration, iron oxides, magnetism, polyacrylonitrile, polyethyleneimine, toxicity, wastewater treatment, water purification
Inorganic/organic composite electrospun fibers have been extensively investigated as adsorbents for the wastewater treatment. In this study, branched polyethylenimine (b-PEI) functionalized magnetic iron oxide (Fe3O4)/polyacrylonitrile (PAN) composite electrospun fiber adsorbent (b-PEI-FePAN) was fabricated and systematically explored for the removal of toxic hexavalent chromium [Cr(VI)]. b-PEI grafted PAN organic component not only acted as the flexible substrate to load Fe3O4 particles but also made a contribution to the improved adsorption capacity. In the batch adsorption test, the maximum adsorption capacity based on Langmuir fitting was 684.93mg/g, which was higher than most of the reported adsorbents. The removal efficiency could reach above 98% with a dosage of 0.5mg/mL in the real water samples. Moreover, the filtration efficiency was also above 98.5% even at a high flux of 765L·m⁻²·h⁻¹ in dynamic filtration experiment. According to mechanism analysis, both electrostatic adsorption and reduction action were involved in the Cr(VI) removal processes. These results demonstrate that b-PEI functionalized Fe3O4/PAN composite electrospun fibers have promising potential in water purification field.