Selective separation and purification of ReO4- by temperature-sensitive imprinted polymer with porous interconnected network structure

In this study, an intelligent block temperature-sensitive PDEA- b -P (DEA- co -AM) was prepared by RAFT polymerization first. Subsequently, it was introduced into the preparation process of ReO 4 - -TPIP to investigate its effect on selective separation performance. ReO 4 - -TPIP was prepared by Pickering-like HIPE polymerization, which could form a porous interoperable network structure and further accelerate the mass transfer rate of ReO 4 - significantly. The structure and morphology of ReO 4 - -TPIP were characterized by FTIR, SEM-EDS, BET, and ICP-AES. Results documented that ReO 4 - -TPIP could reach adsorption equilibrium at 31 °C after 120 min, the maximum adsorption capacity ( Q ) was 0.16 mmol/g, and the desorption efficiency ( D ) arrived at 82.21%, with 3.26 of selective adsorption coefficients in equal molar concentration solution of ReO 4 - and MnO 4 - . After 11 repeated adsorption-desorption recycles, the adsorption capacity and desorption efficiency remained at 79.10% and 71.01% of their initial value, respectively. More surprisingly, the purity of Re in solution rose from 35.41% to 62.82% after 1 adsorption-desorption recycle of ReO 4 - -TPIP in the secondary leaching solution of high-temperature alloys. This demonstrates the promising development of this material for the industrial separation and purification of Re.