The Preparation Of Cu(Ⅱ) Ion Imprinted Material And The Research For Its Absorptive Ability In Rare Earth

Rare earth has the unique electric, magnetic and superconducting multiple performance,modern industry "gold" laudatory reputation, it is strategic resources that apply to the fields such as the forefront of technology research and development of new materials, high-tech industry and national defense construction.There are a wide range of rare earth elements, its atomic structure is similar, the chemical activity properties is high, the physical and chemical properties is similar, therefore, rare earth elements often mix together, symbiotic in the same deposit, caused by complex mineral composition. Therefore, the single separation of rare earth elements is a very difficult and complicated process, and it also must consider the separation between the earth elements and its associated impurities such as iron and aluminum.In addition, in order to meet the development of high purity single rare earth products, we also need to separate impurities from rare earth. Such as infrared optical fiber has a very high demand towards rare earth products,Cu, Fe, Co and other transition metal impurities less than10-9; non rare earth impurities(Cu, Al et al) have bad effect on the quality of the products in rare earth ore leaching solution. Therefore, It is very important to study the adsorption of removing non-rare earth elements from rare earth.In this paper, the removal of the separation of rare earth elements in the major non-rare Cu(II) ion were to be on, the different cross-linked imprinted adsorbent for the removal of non-rare-earth ions in rare-earth ions were successfully prepared,the research content mainly includes three parts:In this work, the cross-linked imprinted materials ECH-Cu-CMC with Cu(II) ions in sulfate solution as template was prepared by using carboxymethyl chitosan as raw material and epichlorohydrin as cross-linking agent. The material was characterized by Fourier infrared spectrometer(FTIR). The binding properties and recognition selectivity of the template ion and the rare earth ion were studied,and various adsorption factor were furtherstudied, including initial pH value and adsorption time. The results showed that the materials ECH-Cu-CMC towards Cu(II) ions can produce strong adsorption, the maximum adsorption capacity reached 44.3 mg·g-1; pH=3.0, with respect to the La(III), selectivity coefficient of Cu(II)reached 15.57.Cross-linked imprinted materials GLA-Cu-CMC with Cu(II) ions in sulfate solution as template was prepared by using carboxymethyl chitosan as raw material and glutaraldehyde as cross-linking agent. The binding properties and recognition selectivity of the materials towards the template ion and the rare earth ion were studied,and adsorption conditions,including initial pH value and adsorption time, were further determined. The results showed that GLA-Cu-CMC for Cu(II) ions can produce strong adsorption, the maximum adsorption capacity reached 36.5 mg·g-1.Furthermore, the imprinted materials can selective adsorption of Cu(II) from the mixture solution of Cu(II)/La(III), while the La(III) in the mixture was not adsorbed.Using Cu(II) as template and ethylene glycol diglycidyl ether as crosslinker, the cross-linked carboxymethyl chitosan materials was synthesized.The binding properties and recognition selectivity of the materials towards the template ion and the rare earth ion were studied,and various adsorption factor were further studied, including initial pH value and adsorption time. The results showed that the materials EGDE-Cu-CMC towards Cu(II) ions can produce strong adsorption, the maximum adsorption capacity reached 33.6mg·g-1; pH=3.5,with respect to the La(III), selectivity coefficient of Cu(II)reached 26.88.