通过电渗析过程制造用于脱盐应用的三甲膦功能化阴离子交换膜。

Fabrication of trimethylphosphine-functionalized anion exchange membranes for desalination application via electrodialysis process.

机构信息

Research Institute of Sciences and Engineering (RISE), University of Sharjah, Sharjah, 27272, United Arab Emirates.

Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia.

出版信息

Chemosphere. 2022 Dec;308(Pt 3):136330. doi: 10.1016/j.chemosphere.2022.136330. Epub 2022 Sep 7.

DOI:10.1016/j.chemosphere.2022.136330

PMID:36087733

Abstract

The design of conductive, improved durable and selective anion exchange membranes (AEMs) for desalination application via electrodialysis (ED) process is critical for a more sustainable future. This work reports the design of a series of homogeneous trimethylphosphine (TMP)-functionalized anion exchange membranes (AEMs) for desalination application via electrodialysis (ED) process. Physico-chemical characterization and electrochemical performance of the trimethylphosphine-functionalized anion exchange membranes was conducted and the activity found to be tuned by varying the quantity of trimethylphosphine into the membrane architecture. For anion exchange membranes M1 to M4, the ion exchange capacity (IEC) was increased from 1.35 to 2.16 mmol/g, water uptake (W) from 4.30 to 17.72%, linear expansion ratio (LER) from 3.70 to 12.50% with enhancing the quantity of trimethylphosphine into the polymer architecture. The ionic resistance decreased from 15.14 to 2.61 Ω cm with increasing quantities of trimethylphosphine whereas transport number increased from 0.98 to 0.99. The performance of synthesized trimethylphosphine-functionalized anion exchange membranes in desalination of NaCl was evaluated via electrodialysis process (flux of 3.42 mol/m. h and current efficiency of 64.30%). Results showed that the prepared trimethylphosphine-functionalized membrane (optimum M4) possess improved desalination performance as compared to commercial membrane Neosepta AMX under identical experimental conditions.

摘要

通过电渗析（ED）过程设计用于海水淡化应用的导电、改进的耐用和选择性阴离子交换膜（AEM）对于更可持续的未来至关重要。这项工作报道了一系列通过电渗析（ED）过程用于海水淡化应用的均相三甲膦（TMP）功能化阴离子交换膜（AEM）的设计。对三甲膦功能化阴离子交换膜的物理化学特性和电化学性能进行了测试，并发现通过改变膜结构中的三甲膦的数量可以调节其活性。对于阴离子交换膜 M1 到 M4，离子交换容量（IEC）从 1.35 增加到 2.16 mmol/g，吸水率（W）从 4.30 增加到 17.72%，线性膨胀比（LER）从 3.70 增加到 12.50%，同时增加了三甲膦进入聚合物结构的数量。随着三甲膦数量的增加，离子电阻从 15.14 降低到 2.61 Ω·cm，而迁移数从 0.98 增加到 0.99。通过电渗析过程评估了合成的三甲膦功能化阴离子交换膜在 NaCl 脱盐中的性能（通量为 3.42 mol/m·h，电流效率为 64.30%）。结果表明，与相同实验条件下的商业膜 Neosepta AMX 相比，所制备的三甲膦功能化膜（最佳 M4）具有改进的脱盐性能。