Synthesis, characterization and adsorption behavior of Pb ²⁺ - Imprinted polymer in aqueous solution

Pb ²⁺ -imprinted polymer particles were prepared by surface molecular imprinting technique and sol-gel process with Pb ²⁺ ion as the template, chitosan as the functional monomer, silica gel as the carrier, and KH-560 as the cross-linking aìent. Both the imprinted and non-imprinted polymer particles were characterized by FT-IR, UV-spectra, and seanning electron microscopy. The effect of adsorption acidity, sorbent dosage and resting time on adsorption râte was investigated by inductively coupled plasma atomic emission spectrome-try. Selectivity for Pb ²⁺ ions of the prepared polymer was also studied in mixed aqueous solution. Adsorption capacity of Pb ²⁺ -imprinted polymer was compared with that of non-imprinted polymer. Finally, imprint and adsorption mechanism was also put fonvard. The optimum acidity for quantitative enrichment was around pH 4. 5 and the adsorption equilibrium could be reached in five hours. Pb ²⁺ -imprinted polymer exhibited high selectivity for Pb ²⁺ ions, and its adsorption capacity was two times higher than that of non-imprinted polymer.