【摘要】 本文合成了偶氮氯膦-mA螯合纤维,研究了酸度及共存离子对其稳定性的影响,探讨了该螯合纤维对稀土元素的吸附行为.更多还原

【Abstract】 The selectivity of CPA-mA, a chelate reagent, is about the same for all REE including Y. The VS-2 fiber, being basic anion exchange fiber, has larger exchanging capacity and faster exchanging with CPA-mA. The CPA-mA chelate-forming fiber has been prepared by means of combining CPA-mA with VS-2 fiber in this paper. The stability of the CPA-mA fiber was studied and the test results shown that the fiber was stable in the solutions of ClO-4, CO32- , SO42-, Cl~- and CH3COO- with pH 1.0, respectively. The exchanging capacity of VS-2 fiber with CPA-mA is about 0. 26 mmol/g. The CPA-mA chelate-forming fiber can be used to separate and preconcentrate the trace amounts of REE. The experiment results have demonstrated that REE could be separated from a large quantities of matrix elements without elution under the given experiment conditions. The pH of the analyzed solutions was 1. 0 to 2. 0, the flowing speed was more than 12 mL/min, it is many times as fast as the analogous resins. The cations, such as ions of Fe, Ca, Al, Mn, Cu, Pb, Co, Ni, Th, Zr and V etc. , do not have influence on the separating REE with CPA-mA fiber under the condition of existing ascorbic acid, EDTA, CyDTA and EGTA. The test results have shown that the CPA-mA fiber was characterized by litter interelement interference, larger exchanging capacity and lower cost when it was used to separate and preconcentrate the trace REE in complex. It is an effective substance for separating the rare earth elements.更多还原