Ashraf Muhammad Adnan, Islam Atif, Butt Muhammad Arif, Mannan Hafiz Abdul, Khan Rafi Ullah, Kamran Kashif, Bashir Shahid, Iqbal Javed, Al-Ghamdi Ahmed A, Al-Sehemi Abdullah G
Institute of Polymer and Textile Engineering, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan.
Institute of Chemical Engineering and Technology, University of the Punjab, Quaid-e-Azam Campus, Lahore 54590, Pakistan.
Membranes (Basel). 2021 Oct 14;11(10):786. doi: 10.3390/membranes11100786.
Diffusion dialysis (DD) using anion exchange membranes (AEM) is an effective process for acid recovery and requires the preparation of suitable materials for AEMs, characterized by unique ions transport properties. In this work, novel AEMs composed of quaternized diaminobutane (QDAB) and poly(vinyl alcohol) (PVA) were cross-linked by tetraethoxysilane (TEOS) via the sol-gel process. The prepared AEMs were systematically characterized by Fourier-transform infrared (FTIR) spectroscopy, ion-exchange capacity (IEC) analysis, thermo gravimetric analysis (TGA), water uptake, linear expansion ratio (LER), and mechanical strength determination, scanning electron microscopy (SEM), and DD performance analysis for acid recovery using a hydrochloric acid/iron chloride (HCl/FeCl) aqueous mixture and varying the QDAB content. The prepared AEMs exhibited IEC values between 0.86 and 1.46 mmol/g, water uptake values within 71.3 and 47.8%, moderate thermal stability, tensile strength values in the range of 26.1 to 41.7 MPa, and elongation from 68.2 to 204.6%. The dialysis coefficient values were between 0.0186 and 0.0295 m/h, whereas the separation factors range was 24.7-44.1 at 25 °C. The prepared membranes have great potential for acid recovery via diffusion dialysis.
使用阴离子交换膜（AEM）的扩散渗析（DD）是一种有效的酸回收工艺，需要制备具有独特离子传输特性的适合AEM的材料。在这项工作中，由季铵化二氨基丁烷（QDAB）和聚乙烯醇（PVA）组成的新型AEM通过溶胶-凝胶法用四乙氧基硅烷（TEOS）交联。通过傅里叶变换红外（FTIR）光谱、离子交换容量（IEC）分析、热重分析（TGA）、吸水率、线性膨胀率（LER）、机械强度测定、扫描电子显微镜（SEM）以及使用盐酸/氯化铁（HCl/FeCl）水性混合物并改变QDAB含量进行酸回收的DD性能分析，对制备的AEM进行了系统表征。制备的AEM的IEC值在0.86至1.46 mmol/g之间，吸水率在71.3%至47.8%之间，具有适度的热稳定性，拉伸强度值在26.1至41.7 MPa范围内，伸长率在68.2%至204.6%之间。透析系数值在0.0186至0.0295 m/h之间，而在25℃下分离因子范围为24.7 - 44.1。制备的膜在通过扩散渗析进行酸回收方面具有很大潜力。
