The Preparation Of Fe(Ⅲ) Ion Surface-imprinted Material And The Basic Research For Its Ability Of Removing Foreign Ions From Rare Earth

Rare earth is known as the industrial "gold", it is a set of elements which has electrical,magnetic, optical, and biological characteristics, it is a set of elements which applys to thefield of high-tech such as the information technology, biotechnology, energy technology. Atthe time,it is also the national defense construction materials.The atomic structure of rareearth elements is similar, the physical and chemical properties is similar, these propertiesdetermine that they often exist in the same minerals. Therefore, the single separation of rareearth elements is a very difficult and complicated process, and it also must consider theseparation between the earth elements and its associated impurities such as iron and aluminum.Fe （Ⅲ） ion is the main impurity elements in the rare earth elements, In order to adapt to theneeds of many high-tech fields, it is necessary to remove Fe（Ⅲ） from rare earth impurities forthe purification of rare earth elements Fe（Ⅲ） ions surface-imprinted material was prepared byusing the novel surface imprinting technique found up by our research group, and mainlystydied recognition selectivity and fine binding affinity for Fe（Ⅲ）ions. If this study ofsolid-phase extraction ion imprinting technology is introducted to the process of theseparation between the earth elements and its associated impurities. It may greatly improveefficiency of rare earth except for its impurities. Therefore，the results of this study hasimportant scientific significance and application value to promote the quality of the rareearth products.Micron-sized silica gel particles were chemically surface-modified with coupling agent3-aminopropyltrimethoxysilane （AMPS）, and amino groups were introduced onto the surfacesof silica gel particles. A redox initiation system of amino group-cerium salt was constructed,and the graft-polymerization of sodium p-styrenesulfonate （SSS） on the surfaces of silica gelparticles was explored and investigated, obtaining the grafted particles PSSS/SiO₂. The effectsof different factors on the surface-initiated graft polymerization were investigated in depth, and ultimately determine the optimal grafting condition: dropping process is appropriate forthe feeding way of the initiator solution that is consisted of cerium salt and sulfuric acid.temperature is50℃,the concentration of monomer is14%, On this condition，the graftingdegree can get up to17.3g/100g. On the basis of that, the adsorption property and adsorptionmechanism of the grafted microspheres for pirimicarb were researched in depth. Studies haveshown that the grafted particle PSSS/SiO₂has strong adsorption ability for Fe（Ⅲ）ions andrare earth metal ions by ion exchange action.Then in the reaction system of aqueous solutions of pH=2, ionic imprinted polymers ofIron ions were prepared with Sodium styrene sulfonate as functional monomer,N,N’-Methylenebisacrylamide as crosslinker and pirimicarb as a template ion. With two kindsof rare earth metal ions (La³⁺and Pr³⁺) as contrast substances, both static and dynamicmethods were adopted to study the binding properties and recognition character of ionicimprinted polymers of Iron ions for Iron ions. The experiment results show that ionicimprinted polymers of Iron ions have the binding properties and recognition character for Ironions. Besides, ionic imprinted polymers of Iron ionshas excellent elution property, with adiluted aqueous solution of acidic NaCl as the eluent. the desorption ratios of pirimicarb reach98.5%in29BV. studies have shown that, The best molar ratio of amount of functionalmonomer and amount of crosslinker is6:1, and the best molar ratio of amount of functionalmonomer and amount of template molecule is3:1.Micron-sized silica gel particles were chemically surface-modified with coupling agent3-aminopropyltrimethoxysilane （AMPS）, and amino groups were introduced,A redox initiating system was set up by the amino groups on the surface of AMPS-SiO₂particles and persulfate in the solution,2-hydroethyl methacrylate was brong in The surface ofthe AMPS-SiO₂through the surface-initiated graft-polymerization. resulting in the graftedparticles PHEMA/SiO₂. Take the Na2CO3as acid-acceptor, a nucleophilic substitutionreaction which between the grafted PHEMA and5-chloromethyl-8-hydroxyquinoline （CHQ）which is the reagent was carried out, resulting in the grafted macromoleculesHQ-PHEMA/SiO₂. Then the ion imprinting towards the grafted macromolecules HQ-PHEMA was conducted with Fe（Ⅲ） ion as the template ion and dichloroether as crosslinker in aqueoussolution system. and Fe（Ⅲ） ion surface-imprinted material IIP-HQP/SiO₂was prepared.With two kinds of rare earth metal ions (La³⁺and Pr³⁺) as contrast substances, both static anddynamic methods were adopted to study the binding properties and recognition character ofionic imprinted polymers of Iron ions for Iron ions. The experiment results show that ionicimprinted polymers of Iron ions have the binding properties and recognition character for Ironions. Besides, ionic imprinted polymers of Iron ionshas excellent elution property, with adiluted aqueous solution of HCl （0.1mol/L） as the eluent. the desorption ratios of pirimicarbreach98.6%in10BV. Besides, experiments show that it is the best imprinting result when theratio of amount of HEMA anf amount of crossing agent is3:1.