Removal and recovery of lead(II) from aqueous solutions using liquid membranes during electrodialysis
Lead(II) is a highly toxic heavy metal and the removal of lead(II) ions from effluents and wastewaters is an important problem in industry. A novel hybrid process for lead(II) removal and recovery from aqueous solutions has been developed. Transport through the liquid membranes was found to be effective for lead(II) ions removal from dilute nitric acid solutions during galvanostatic electrodialysis. Di(2-ethylhexyl)phosphoric acid (D2EHPA)- based solutions in 1,2-dichloroethane were used as the liquid membranes. The effects of composition of the aqueous solutions and liquid membranes as well as effect of the current density on the lead(II) removal efficiency were studied. The results showed that it is possible to remove about 93% of lead(II) from the feed solution containing 0.01 M Pb(NO3)2 after several hours of electrodialysis. The maximum electrodeposition degree of ~ 60 % was obtained at the optimum operating conditions. Matte, smooth and highly adherent lead electrodeposits were obtained from 0.2 M HClO4 solutions.
Date
01.12.2016.
Keywords
lead(II); liquid membrane; di(2-ethylhexyl)phosphoric acid; electrodialysis; electrodeposition
