关键词: 聚氨酯 , 二乙烯三胺, 印迹 , 吸附 , Pb²⁺

Abstract:  In order to synthesize an efficient adsorption resin and study their rules for Pb2+.The polyurethane prepolymer（PU） were synthesized by methylene diphenyl diisocyanate（MDI） ， trimethylolpropane （TMP） and polypropylene glycol （PPG-600）， then ion imprint chelate polyurethane resin（PU-DETA-IIP） were prepared by grafted diethylenetriamine （DETA）， lead ion template and crosslinking agent by using chemical polymerization. The sample were characterized by using Fourier transform infrared spectroscopy （FT-IR）， Thermogravimetric analysis（TG） and Brunauer-Emmett-Teller （BET）. The effects of graft DETA， template and their dosage on adsorption properties were investigated by adsorption experiment of polluted wastewater simulated by lead nitrate solution. The results showed when the amount of chelating agent DETA and template Pb2+ for PU-DETA-IIP was 1.4 g and 1.2 g respectively， the initial concentration of Pb²⁺ was 200 mg /L， the adsorption temperature was 303 k， the time was 120 min， and the pH was 5， the adsorption capacity and removal rate were 39.92 mg /g and 99.80%， respectively. QPU-DETA-IIP/QPU-DETA-NIIP was 1.47，QPb/QFe was 21.73. It has good imprinting effect.

Key words:  Polyurethanesd, Iethylenetriamine, Molecular imprinting, Adsorption, Pb²⁺