Institute of Chemistry, St. Petersburg State University, Universitetsky pr. 26, Peterhof, Saint Petersburg, 198504, Russia.
Laboratoire Réactions et Génie des Procédés, CNRS, Université de Lorraine, ENSIC, 1 rue Granville, 54000, Nancy, France.
Environ Sci Pollut Res Int. 2018 Jul;25(21):20354-20362. doi: 10.1007/s11356-017-9063-9. Epub 2017 Apr 29.
This study focuses first on the preparation of mixed matrix supported membranes of polyvinyl alcohol (PVA) and low-hydroxylated fullerenol C(OH) used to create water selective membranes and then on their pervaporation properties for the separation of water-THF mixtures. These novel supported PVA membranes containing nano-carbon particles were prepared to reach high membrane performance for further integration in a dehydration process, such as distillation coupled to pervaporation. The separation of water-THF mixtures was performed with the supported membranes over a wide range of water concentrations in the feed mixture, i.e., from the azeotrope range up to 30 wt%, to evaluate the performance and stability of the thin active layer. SEM was used to visualize the internal morphology of the membrane. The influence of temperature on the transport properties was also investigated. All the membranes were highly water selective and stable up to 30 wt% water in the feed. The best compromise of transport properties was obtained for the C(OH)(5%)-PVA supported composite membrane: a permeate enrichment of 99.3 ± 0.3 wt% water and a flux of 0.25 ± 0.02 kg/(m h) for the separation of a mixture containing 5.7 wt% water and 94.3 wt% tetrahydrofuran (THF) at 30 °C. Considering its water stability, this supported membrane with a dense layer thinner than 2 μm appears promising for use in hybrid industrial processes to upgrade solvents with a smaller environmental footprint than conventional methods.
本研究首先专注于制备聚（醇）和低羟基化富勒醇 C(OH) 的混合基质支撑膜，用于制备水选择性膜，然后研究其在水-四氢呋喃混合物分离中的渗透蒸发性能。这些新型含纳米碳颗粒的支撑 PVA 膜是为了达到高膜性能而制备的，以便进一步集成在脱水过程中，例如与渗透蒸发耦合的蒸馏。在宽浓度范围内，即从共沸物范围到 30wt%，用支撑膜分离水-四氢呋喃混合物，以评估薄活性层的性能和稳定性。SEM 用于可视化膜的内部形态。还研究了温度对传输性能的影响。所有的膜都具有很高的水选择性和稳定性，在进料中水的浓度高达 30wt%。对于 C(OH)(5%)-PVA 支撑复合膜，获得了最佳的传输性能折衷：在 30°C 下，分离含有 5.7wt%水和 94.3wt%四氢呋喃的混合物时，渗透物的浓缩度为 99.3±0.3wt%，通量为 0.25±0.02kg/（m h）。考虑到其水稳定性，这种具有小于 2μm 厚致密层的支撑膜有望用于混合工业过程中，以升级溶剂，其环境足迹小于传统方法。
