Add time:08/15/2019         Source:sciencedirect.com

Phosphate removal is an important measure required to control eutrophication of water bodies as it inhibits excessive algal growth. Currently available phosphate removal methods have various limitations and function poorly under wide pH ranges. This study successfully prepared and characterized a novel nanocomposite adsorbent, [email protected], which has high capacity and specific affinity towards phosphate. The [email protected] constituted of nanostructured hydrated ferric oxide and hydrated zirconium oxide loaded on the surface and inside the pores of a polymeric anion exchanger. Batch experiments were conducted to investigate the effects of varied conditions on phosphate adsorption. The results demonstrated that [email protected] achieved high phosphate removal efficiencies over a wide pH range (4–11), which indicates higher adaptability towards varying environmental conditions. In addition, [email protected] exhibited enhanced phosphate adsorption capacity regardless of coexisting anions (chloride, nitrate, sulfate, and carbonate) at different concentrations. Kinetic analysis suggested that the adsorption process best-fitted with the pseudo-second-order kinetic model, suggesting chemical sorption mechanism. Furthermore, the underlying mechanism of phosphate adsorption by [email protected] was assessing through XPS analysis. Phosphate removal was effected by the replacement of hydroxyl groups by phosphate species and interaction between ammonium groups and phosphate. In general, these results indicated that [email protected] is a highly efficient adsorbent for phosphate removal with excellent adaptability to varying and undesirable environmental conditions.

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