With the continuous depletion of global rhenium resources, the separation and purification of rhenium (Re) from secondary resources became very important. Herein, an imprinted composite membrane with “flexible chain” thermo‐responsive imprinted separation layer structure (Re‐TIICM) was prepared to achieve selective separation and recovery of Re from secondary resources with complex composition. Re‐TIICM's thermo‐responsive imprinted separation layer occurred sol/gel phase transition by adjusting the temperature, which effectively mitigated the trade‐off between selectivity and desorption. The structure and performance of Re‐TIICM under optimum process conditions were tested and evaluated. The results showed that Re‐TIICM exhibited a maximum adsorption capacity of 0.1036 mmol/g at 35°C, a separation degree of 4.37 (MnO4− as disturbing ions), and remained good adsorption capacity and selectivity after 9 adsorption/desorption cycles. When Re‐TIICM was applied in secondary resources, the purity of Re increased from 35.412% to 70.208% after one adsorption/desorption cycle, showing a great potential for industrial applications.
Increasing social awareness concerning the design of excellent performance toughening agents to curb the adverse effects of insufficient toughness on the wide range of applications of epoxy resin (EP). Herein, a small amount of sorbitol was doped into carbocyclic inositol as a core monomer, and bisphenol‐A and epichlorohydrin were used to produce epoxide‐terminated hyperbranched polyether by one‐pot preparation method. After that, the prepared polymer was used as modifier to improve the toughness and strength of petroleum‐based EPs. Results demonstrated that after adding the homemade epoxy‐terminated hyperbranched polyether (EHBPE) to the EP, the polyether prepared with the ratio of sorbitol and inositol displayed significant advantages compared with the polyether with monomers using only sorbitol and inositol, respectively. In particular, the impact, and tensile strengths of EHBPE‐IS/EP cured sample with EHBPE‐IS loading at 20% were increased by 197.5%, 139.6%, respectively, compared with those of neat EP. In brief, EHBPE‐IS, a member of the family of EHBPEs, provided a facile method for the preparation of bifunctional modifier for tough and strong EP with promising industrial applications.
With decreasing global rhenium resources,
it has become
important
to separate and purify rhenium in secondary resources, so a preparation
strategy for a chitosan-comodified surface-grafted thermosensitive
ion-imprinted composite membrane (CS-Re-TIICM) was developed in this
work. The key of this design was that the two ends of a poly(N,N-diethylacrylamide) (PDEA) chain were
grafted onto the imprinted polymer separating the layer matrix and
the surface of the membrane, respectively, which aimed to improve
the selectivity and desorption ratio of this material simultaneously.
The structure and morphology of this material were characterized by
FTIR and SEM, respectively. In addition, CS-Re-TIICM was applied to
the secondary leaching solution of the high-temperature alloy to test
the actual separation effect, and results showed that CS-Re-TIICM,
possessing thermoresponsive recognition sites, and the structure of
the imprinting cavity could be adjusted by temperature, which helped
this material achieve good selective separation and purification performance
for ReO4
–. The maximum adsorption capacity
was 0.1071 mmol/g at 35 °C. CS-Re-TIICM not only showed an excellent
selectivity (separation ReO4
–/MnO4
– of 3.90 in the presence of interfering
ion MnO4
–) but also presented an excellent
desorption performance (desorption ratio of 68.94%) and good reusability
(adsorption capacity of 0.0425 mmol/g, desorption ratio of 59.13%,
and separation degree of 1.24). When CS-Re-TIICM was applied to the
secondary leaching solution of high-temperature alloys, the purity
of Re was increased from 35.41% to 65.10% after one adsorption/desorption
cycle, which depicted a prospective application in the industrialized
separation of ReO4
– from a complex environment.
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