Preparation, Characterization And Adsorption Properties Of Sb(Ⅲ) Imprinted Polymer

Molecular imprinting technology (MIT) is becoming increasingly recognized as a powerful technique of preparing synthetic polymers that contain tailor-made recognition sides for certain ions.The principle of MIT is like this:it takes the target molecular as template, then combins the functionalization polymer which has supplementary structure with the template molecular, and then takes the proceese of polymerlization and wipeing off the template, at last the Molecular imprinted polymer (MIP) is made. Ion imprinting technology (IIT) is similar to MIT, but the template is ions not moleculars. IIT preserves the advantage of MIT like the structure-activity predictable, specific recognition and broad applicability, etc. IIT has been used in the fields like separation and purification, chemical and biological sensors, simulation and trace analysis of enzyme catalysts, etc.In this paper, a surface molecular imprinting technique on the surface of micoro-bead silica gel particles was put forward, using grafting:firstly functional monomer (3-cyanatopropyl triethoxysilane and3-thiocyanatopropyl triethoxysilane were used respectively in this paper) was grafted on the silica gel particle surfaces via coupling grafting method; secondly ion imprinting was preformed using heavy-metal ion, Sb3+, as the template, which has been coordinated with the functional monomer, and epichlorohydrin (ECH) as crosslinking agent; finally ion-imprinted composite material Sb-IIP was formed. The optimum processing conditions were investigated with reaction temperature, reaction time, and the type of crosslinking agent and other factors to serve as targets.Study the Sb-IIP’s adsorption capacity of Sb3+in the following three conditiongs: different bulk concentration, different adsorption time and different bulk pH. Experimental results show that the adsorption rate was fast,20minutes was enough to reach equilibrium; the adsorption effects were very good at pH3to9conditions.The bingding characteristics of Sb-IIP for Sb3+were studied in detail by adopting static methods. The experimental results showed that the Sb-IIP has specific recognition ability for Sb3+, and this character displays in two aspects;(1) It has high affinity for Sb3+, the binding amounts for Sb3+are15.3mg·g-1and14.3mg·g-1respectively.(2) It has excellent selectivity for Sb3+and its selectivity coeffecients relative to Cd2+, Ni2+, Cu2+, Pb2+and Fe3+are2.6,2.4,3.7,2.7,5.9(IIP-CPTS/SiO2);2.2,2.0,2.9,2.6,2.3(IIP-TCPTS/SiO2) respectively. Besides, the Sb-IIP has a fine elution property using HC1solution as eluent.