Khetsomphou Elodie, Deboli Francesco, Donten Mateusz L, Bazinet Laurent
Institute of Nutrition and Functional Foods (INAF), Dairy Science and Technology Research Centre (STELA) and Department of Food Sciences, Université Laval, Quebec, QC G1V 0A6, Canada.
Laboratoire de Transformation Alimentaire et Procédés ÉlectroMembranaires (LTAPEM, Laboratory of Food Processing and ElectroMembrane Processes), Université Laval, Quebec, QC G1V 0A6, Canada.
Membranes (Basel). 2024 Jul 12;14(7):155. doi: 10.3390/membranes14070155.
Promising results were recently reported for hierarchical ion-exchange membranes, fabricated by the UV crosslinking of a thin functional coating on a porous substrate, on model NaCl solution demineralization by electrodialysis (ED). Hierarchical anion-exchange membranes (hAEMs) have never been tested with complex solutions to demonstrate their potential use in the biofood industry. The impact of three different crosslinking densities of the ion-exchange coating (EbN-1, EbN-2 and EbN-3) on the performances of whey demineralization by ED was investigated and compared with commercial AMX. The results showed that by increasing the coating crosslinking density, the membrane conductivity decreased, leading to an increase in the global system resistance during whey demineralization (from +28% to +64%). However, 18% sweet whey solutions were successfully treated until 70% demineralization for all membranes. The energy consumption (averaged EbN value of 14.8 vs. 15.1 Wh for AMX) and current efficiency (26.0 vs. 27.4%) were similar to the control. Potential fouling by non-protein nitrogen was detected by ATR-FTIR for hAEMs impacting some membranes properties and ED performances. Overall, EbN-1 obtained results were comparable with the benchmark and can be considered as an alternative membrane for whey demineralization by ED and other applications in the demineralization of complex products from the food industry.
最近有报道称，通过在多孔基材上对薄功能涂层进行紫外线交联制备的分级离子交换膜，在通过电渗析（ED）对模拟NaCl溶液进行脱盐方面取得了有前景的结果。分级阴离子交换膜（hAEMs）从未在复杂溶液中进行过测试，以证明其在生物食品工业中的潜在用途。研究了离子交换涂层的三种不同交联密度（EbN-1、EbN-2和EbN-3）对通过ED进行乳清脱盐性能的影响，并与商用AMX进行了比较。结果表明，随着涂层交联密度的增加，膜的电导率降低，导致乳清脱盐过程中整体系统电阻增加（从+28%增加到+64%）。然而，所有膜都成功处理了18%的甜乳清溶液，脱盐率达到70%。能量消耗（EbN平均值为14.8，而AMX为15.1 Wh）和电流效率（分别为26.0%和27.4%）与对照相似。通过ATR-FTIR检测到hAEMs存在非蛋白质氮引起的潜在污染，这影响了一些膜的性能和ED性能。总体而言，EbN-1获得的结果与基准相当，可被视为通过ED进行乳清脱盐以及食品工业复杂产品脱盐其他应用的替代膜。
