设计具有托品𬭩功能化的阴离子交换膜，通过扩散透析过程回收酸。

Design of tropinium-functionalized anion exchange membranes for acid recovery via diffusion dialysis process.

机构信息

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

出版信息

Environ Res. 2023 Jul 15;229:115932. doi: 10.1016/j.envres.2023.115932. Epub 2023 Apr 17.

DOI:10.1016/j.envres.2023.115932

Abstract

Diffusion dialysis (DD) process utilizing anion exchange membranes (AEMs) is an environmentally-friendly and energy-efficient technology. From acidic wastewater, DD is needed for acid recovery. This research reports the development of a series of dense tropinium-functionalized AEMs via solution casting method. Fourier Infrared transform (FTIR) spectroscopy verified the successful preparation of AEMs. The developed AEMs exhibited a dense morphology, featuring 0.98-2.42 mmol/g of ion exchange capacity (IEC), 30-81% of water uptake (W) and 7-32% of linear swelling ratio (LSR). They displayed exceptional mechanical, thermal and chemical stability and were employed for acid waste treatment from HCl/FeCl mixtures via DD process. AEMs possessed 20 to 59 (10 m/h) and 166 to 362 of acid diffusion dialysis coefficient (U) and separation factor (S) respectively at 25 °C. Compared to DF-120 commercial membrane (U = 0.004 m/h, S = 24.3), their DD efficiency was improved under identical experimental conditions.

摘要

扩散渗析（DD）工艺利用阴离子交换膜（AEM）是一种环保且节能的技术。从酸性废水中，DD 需要用于酸回收。本研究通过溶液浇铸法开发了一系列致密的托品功能化 AEM。傅里叶变换红外（FTIR）光谱验证了 AEM 的成功制备。所开发的 AEM 具有致密的形态，其离子交换容量（IEC）为 0.98-2.42mmol/g，吸水率（W）为 30-81%，线膨胀率（LSR）为 7-32%。它们表现出优异的机械、热和化学稳定性，并用于通过 DD 工艺处理 HCl/FeCl 混合物的酸性废水。在 25°C 时，AEM 的酸扩散透析系数（U）和分离因子（S）分别为 20 至 59（10m/h）和 166 至 362。与 DF-120 商业膜（U=0.004m/h，S=24.3）相比，在相同的实验条件下，它们的 DD 效率得到了提高。