Abstract
Ion imprinted composite hydrogel need to be prepared to improve selectivity and efficiency for treating wastewater containing Ni(II). In this paper, Ni(II) imprinted composite hydrogel (CoFe2O4/Bentonite@ polyvinyl alcohol, abbr. IIP-BCFPVAs) was prepared in a environmental friendly way. The polyvinyl alcohol (PVA) was the main non-toxic component of the composite material, and citric acid(CA) was chosen as a cross-linking reagent to enhance the stability of the ion imprinted holes. IIP-BCFPVAs was characterized by SEM, EDS, FTIR, XRD, VSM, BET and XPS. The adsorption effects of pH, reaction time and initial concentration of solution were studied. The selective coefficient K of Ni(II)/Mg(II), Ni(II)/Zn(II) and Ni(II)/Cu(II) were 1.646, 2.453, and 1.973, respectively, indicating that IIP-BCFPVAs showed good selective performance on separation of Ni(II). Adsorption kinetics conforms to pseudo-second-order kinetics and Langmuir model. Refering to XPS, Ni(II) was complexed by hydroxyl groups (–OH). IIP-BCFPVAs is a green and selective adsorbent for removing Ni(II) from wastewater.
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