Adsorption behavior of heavy metal ions on a polymer-immobilized amphoteric biosorbent: Surface interaction assessment.

• A magnetically separable amphoteric biosorbent (PD-Fe 3 O 4 @CCS) was fabricated. • The PD-Fe 3 O 4 @CCS displayed effective adsorption performance for Cr(VI) and Cu(II). • Adsorption behaviors of Cr(VI) and Cu(II) in single and binary systems were studied. • Ion exchange, electrostatic and coordination (chelation) interactions are involved in Cr(VI) (Cu(II)) adsorption. Here we unveiled a novel magnetically separable amphoteric biosorbent (PD-Fe 3 O 4 @CCS) and investigated its adsorption behavior toward two classes of heavy metals, hexavalent chromium (Cr(VI)) and copper (Cu(II)) ions from water. Results indicated that the adsorption behavior of PD-Fe 3 O 4 @CCS for Cr(VI) was well described by Langmuir model; while for Cu(II) adsorption, the Freundlich model was the better one. Based on the kinetic results, both Cr(VI) and Cu(II) adsorption on PD-Fe 3 O 4 @CCS fitted well with the pseudo-second-order kinetic model. To evaluate the reusability and stability of PD-Fe 3 O 4 @CCS, regeneration tests were carried out for five cycles. Furthermore, the applicable feasibility of PD-Fe 3 O 4 @CCS in the real water matrix (including the single and binary pollutant systems) was studied, and results suggested the promising potential of PD-Fe 3 O 4 @CCS for large-scale application. Apart from these, the surface interactions between PD-Fe 3 O 4 @CCS and heavy metal ions in single and binary systems were systematically investigated based on FTIR and XPS analyses, which provided an essential implication for comprehending the interactions between biosorbents and contaminants in wastewater. [ABSTRACT FROM AUTHOR]