Zongkui Qin, Tian Lei, Shanshan Wang, Leilei Liu, Zhijian Tan
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A temperature-responsive mixed matrix membrane based on poly(ionic liquid)@poly(N-isopropylacrylaminde) microgels and polyvinylidene fluoride for the selective separation of citrus flavonoids
Herein, four novel poly(ionic liquid)@poly(N-isopropylacrylaminde) microgels were prepared and doped into polyvinylidene fluoride (PVDF) to fabricate eight temperature-responsive mixed matrix membranes (TRMs) for the efficient separation of natural citrus flavonoids, viz. naringin, neohesperidin, naringenin, and hesperetin. Dynamic light scattering of microgels in water at 20 and 50 ℃ confirmed their temperature-responsive properties. Water flux of TRMs at different temperatures proved their switchable response characteristic between 30 and 35 ℃. The mechanical property, pore size distribution, porosity, and specific surface area of these TRMs were measured. Moreover, the chemical structure, microstructure, hydrophobicity, thermostability, anti-fouling performance, and charge property were also confirmed for them. The M4 membrane exhibited a maximum separation selectivity of 81.66% at 20 ℃. Binding energy of G4 microgel to flavanone glycosides through H-bonding was greater than that of G4/flavanones. These TRMs, as a kind of novel separation materials, have the potential in the separation of various natural products.
期刊介绍：
The Microchemical Journal is a peer reviewed journal devoted to all aspects and phases of analytical chemistry and chemical analysis. The Microchemical Journal publishes articles which are at the forefront of modern analytical chemistry and cover innovations in the techniques to the finest possible limits. This includes fundamental aspects, instrumentation, new developments, innovative and novel methods and applications including environmental and clinical field.
Traditional classical analytical methods such as spectrophotometry and titrimetry as well as established instrumentation methods such as flame and graphite furnace atomic absorption spectrometry, gas chromatography, and modified glassy or carbon electrode electrochemical methods will be considered, provided they show significant improvements and novelty compared to the established methods.
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