数字农科院2.0

PVDF-based temperature-responsive composite membranes decorated by incorporating MOF and poly(ionic liquid) for highly selective separation of flavonoid glycosides and aglycones from citrus fallen fruits

文献类型： 外文期刊

作者： Zongkui Qin;Tian Lei;Nengxiang Wu;Xinxiang Shu;Leilei Liu;Zhijian Tan

作者机构：

关键词： Membrane;Plant active ingredients;Poly(ionic liquid);Separation;Zeolitic imidazolate framework

期刊名称： Microchemical Journal

ISSN： 0026-265X

年卷期： 2025 年 213 卷

页码：

收录情况： SCIE（2025版）

摘要： Developing efficient methods for separating and purifying citrus flavonoids is challenging. This work explored a temperature-responsive composite membrane using poly(ionic liquid) (PIL), polyvinylidene fluoride (PVDF), and metal–organic frameworks (MOFs), enabling selective separation of flavonoid glycosides (naringin and neohesperidin) and aglycones (naringenin and hesperetin). A PIL containing temperature-responsive monomer of N-isopropylacrylamide (NIPAM), was doped into the PVDF matrix, and zeolitic imidazolate framework-8 (ZIF-8) was anchored on the PIL/PVDF membrane surface via in-situ synthesis, forming a stable structure. Their porosity, hydrophobicity, thermal stability, and mechanical strength were confirmed. When the temperature increased from 30 to 35 °C, the membrane pore size significantly expanded due to the contraction effect of NIPAM, resulting in an increase in the water flux of the four composite membranes by more than 27.8 %. Furthermore, five experimental variables, including the molar ratio of PIL monomer, temperature, feed concentration, feed pH, and NaCl concentration were selected to systematically evaluate the separation performance of the composite membrane for four citrus flavonoids. The results demonstrated that the composite membrane containing both ZIF-8 and PIL exhibited significantly higher separation efficiency compared to pure PVDF and PIL/PVDF membranes. Among them, the M4 membrane performed the best, achieving a total rejection rate of 307.35 % and a separation selectivity of 47.77 % for the four flavonoids at 25 °C. The composite membrane could be regenerated using an alkaline solution (pH = 11), with a total recovery rate of 312.13 % for the four flavonoids, including a recovery rate of 95.39 % for naringenin. Although the membrane structure remained intact after five reuse cycles, the rejection rate showed a decline. This composite membrane is a promising candidate material that can efficiently and selectively separate flavonoid glycosides and aglycones and offers a reference for the separation of other plant active components.

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