Research on Separation of Tc from Mo with Viologen-Based Cationic Organic Polymer

To increase the radioactivity of ^99mTc in the eluent to meet the needs of medical diagnosis, finding a new type of high-efficiency molybdenum and technetium separation material is important. In this study, a viologen-based cationic organic polymer (VBCOP) was prepared and its adsorption toward ReO^-₄ and MoO^2-₄ was studied. The influence of pH, the initial concentration of Mo and Re was investigated. In addition, the sorption performance of VBCOP on Re in solutions containing different molar ratios between Re (10 mg·L^-1) and Mo was studied. The results show that VBCOP has excellent sorption performance for Re and good selectivity. VBCOP can show good adsorption performance in a wide range of pH, and the effect of alkaline conditions on Mo is greater than that on Re. The saturated sorption capacity of VBCOP for ReO^-₄ reaches 597 mg·g^-1 and the saturated sorption capacity for MoO^2-₄ is 196 mg·g^-1. Under neutral conditions, and when the Re∶Mo molar ratio is 1∶10 000, VBCOP can still exhibit a certain adsorption effect on ReO^-₄ (35%), which is expected to pave the way for further research.