Adsorption and Recognition Performance of Lead Ion imprinted Micro beads

Abstract:

As to the problem of the heavy metal pollution in the water environment and the wastewater treatment, a lead ion imprinted micro beads, with two functional monomers 1,12 dodecanediol o,o’ diphenyl phosphonic acid(DDDPA) and 4 vinylpyridine, were synthesized. Its adsorption and recognition performance were investigated. The lead ion imprinted micro beads were efficient for lead ions removal from the aqueous solutions in a broad pH range (pH> 5). In the presence of competitive ions Zn2+, Co2+, Ni2+, it shows a high selectivity for lead ions. The selectivity coefficient of Pb2+/Zn2+, Pb2+/Co2+ and Pb2+/Ni2+ are 86.6, 53.0 and 46.5, respectively. Meanwhile it shows a certain adsorption capacity for Cr3+ and Cu2+, the selectivity coefficient of Pb2+/ Cr3+ and Pb2+/ Cu2+ are 20.8 and 9.5, respectively. The desorption experiments indicate that the lower concentration of nitric acid has almost 100% removal efficiency for the low quantity of lead ions. After the recycle of adsorption desorption experiment, the lead ion imprinted polymer still shows a high adsorption capacity of 90.9 mg·g-1.