调节新型不对称整体磺化聚砜阳离子交换膜的电化学性能,Molecules

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调节新型不对称整体磺化聚砜阳离子交换膜的电化学性能
Molecules ( IF 4.2 ) Pub Date : 2021-01-07 , DOI: 10.3390/molecules26020265
Ahmet Halil Avci ₁ , Cédric Van Goethem ₂ , Timon Rijnaarts ₃ , Sergio Santoro ₁ , Marco Aquino ₁ , Gianluca Di Profio ₄ , Ivo F J Vankelecom ₂ , Wiebe M De Vos ₃ , Enrica Fontananova ₄ , Efrem Curcio ₁

Affiliation

在这项研究中，通过磺化聚砜 (SPSf) 溶液的湿相转化制备了新型不对称整体阳离子交换膜。通过改变用作磺化剂的氯磺酸的量来合成具有不同磺化度 (DS) 的 SPSf。使用 FTIR 和 1H-NMR 技术对 SPSf 样品进行表征。选择 DS 为 0.31（0.67 meq/g 相应离子交换容量）的 SPSf 来制备膜，因为具有较高 DS 的聚合物导致较差的机械性能和在水中过度膨胀。通过系统研究，证明了通过作用于聚合物溶液的组成来调整 SPSf 膜性能的机会。两种不同的相转化参数，溶剂类型和共溶剂比的影响，通过形态学和电化学表征进行了研究。使用 2-丙醇 (IPA):1-甲基-2-吡咯烷酮 (NMP) 以 20:80 的比例制备的膜获得了最佳性能（0.86 的渗透选择性和 6.3 Ω∙cm2 的电阻）。该膜在不同溶液浓度下进一步表征，以评估其在反向电渗析 (RED) 操作中的性能。尽管估计发电量低于用作基准的商用 CMX（Neosepta）膜，但量身定制的膜可被视为具有成本效益的替代方案，因为 RED 商业化的主要限制之一是膜价高。使用 2-丙醇 (IPA):1-甲基-2-吡咯烷酮 (NMP) 以 20:80 的比例制备的膜获得 3 Ω∙cm2)。该膜在不同溶液浓度下进一步表征，以评估其在反向电渗析 (RED) 操作中的性能。尽管估计发电量低于用作基准的商用 CMX（Neosepta）膜，但量身定制的膜可被视为具有成本效益的替代方案，因为 RED 商业化的主要限制之一是膜价高。使用 2-丙醇 (IPA):1-甲基-2-吡咯烷酮 (NMP) 以 20:80 的比例制备的膜获得 3 Ω∙cm2)。该膜在不同溶液浓度下进一步表征，以评估其在反向电渗析 (RED) 操作中的性能。尽管估计发电量低于用作基准的商用 CMX（Neosepta）膜，但量身定制的膜可被视为具有成本效益的替代方案，因为 RED 商业化的主要限制之一是膜价高。

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Tuning the Electrochemical Properties of Novel Asymmetric Integral Sulfonated Polysulfone Cation Exchange Membranes

In this study, novel asymmetric integral cation exchange membranes were prepared by the wet phase inversion of sulfonated polysulfone (SPSf) solutions. SPSf with different degrees of sulfonation (DS) was synthesized by variation in the amount of chlorosulfonic acid utilized as a sulfonating agent. The characterization of SPSf samples was performed using FTIR and 1H-NMR techniques. SPSf with a DS of 0.31 (0.67 meq/g corresponding ion exchange capacity) was chosen to prepare the membranes, as polymers with a higher DS resulted in poor mechanical properties and excessive swelling in water. By a systematic study, the opportunity to tune the properties of SPSf membranes by acting on the composition of the polymeric solution was demonstrated. The effect of two different phase inversion parameters, solvent type and co-solvent ratio, were investigated by morphological and electrochemical characterization. The best properties (permselectivity of 0.86 and electrical resistance of 6.3 Ω∙cm2) were obtained for the membrane prepared with 2-propanol (IPA):1-Methyl-2-pyrrolidinone (NMP) in a 20:80 ratio. This membrane was further characterized in different solution concentrations to estimate its performance in a Reverse Electrodialysis (RED) operation. Although the estimated generated power was less than that of the commercial CMX (Neosepta) membrane, used as a benchmark, the tailor-made membrane can be considered as a cost-effective alternative, as one of the main limitations to the commercialization of RED is the high membrane price.

更新日期：2021-01-07

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