Removal of Nickel(II) from Aqueous Solution by Complexation-Ultrafiltration with Polyvinyl Pyrrolidone
Pages 95-102
Zhixin Chen, Jianxian Zeng and Yangen Ding

DOI: http://dx.doi.org/10.6000/1929-6037.2016.05.03.2

Published: 26 October 2016

Abstract: This study confers insight into the removal of Nickel(II) from aqueous solution by complexation-ultrafiltration (CP-UF) technique with water-soluble polymer polyvinyl pyrrolidone (PVP). The whole experiment process includes five parts: pre-treatment, CP-UF, concentration, decomplexation and regeneration of polymer. Numerous factors affecting the retention rate of Nickel(II) (R_Ni) and permeate flux (J), such as pH, loading ratio, transmembrane pressure (TMP), complexation time and added salt have been investigated. In the CP-UF process, R_Ni reaches nearly 94% while pH of 7, loading ratio of 4, TMP of 1.0 bar, temperature of 25⁰C, complexation time of 30 min are chosen to be the optimal parameters. In the process of concentration, J declines slowly and R_Niis very high at loading ratio of 4 and pH of 7. Nickel ion concentration in the retentate solution increases linearly with volume concentration factor. In the process of decomplexation, the decomplexation percentage of nickel(II)-PVP complex reaches 42%. The binding capacity of the regenerated PVP is close to that of fresh PVP, and the recovery percentage of binding capacity is higher than 90%..