Functionalized biopolymer based bipolar membrane with poly ethylene glycol interfacial layer for imp
Functionalized biopolymer based bipolar membrane with poly ethylene glycol interfacial layer for imp
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DOI：
10.1016/j.memsci.2011.02.009
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
A. Michael Rajesh;Mahendra Kumar;V. Shahi
中科院分区：
文献类型：
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作者：
A. Michael Rajesh;Mahendra Kumar;V. Shahi
本研究研究了不同分子量（MW）的聚乙二醇（PEG）作为双极膜（BPM）的界面层（IL）对水离解的影响。将壳聚糖（CS）修饰为N-亚甲基膦酸壳聚糖（PC）和季铵化壳聚糖（QC），用于制备BPM的阳离子和阴离子交换层（分别为CEL和AEL）。使用不同分子量（200-3400Da）的 PEG 作为 IL，通过逐层溶液浇铸法（在水介质中实现层间良好的粘附）制备不同的 BPM。分别评估了具有良好离子交换性能的 CEL 和 AEL 的物理化学和电化学特性。所有含有 IL (PEG) 的 BPM 均根据电流-电压 (I-V) 曲线和水解离效率进行评估。实验结果证明了PEG对水解离具有优异的催化活性，并且其分子量进一步提高。此外，双极膜电渗析（EDBPM）实验证实了BPM界面处发生水解离，从而形成酸和碱。
This study investigates the effect of poly ethylene glycol (PEG) of different molecular weight (MW) as interfacial layer (IL) of bipolar membrane (BPM) for water dissociation. Chitosan (CS) was modified to N-methylene phosphonic chitosan (PC) and quaternized chitosan (QC), for preparing cation- and anion-exchange layer (CEL and AEL, respectively) of BPM. Different BPMs were prepared by layer-by-layer solution casting method (in aqueous media to achieve the good adhesion between layers) using PEG of different MWs (200–3400Da) as IL. CEL and AEL with good ion-exchange properties were separately evaluated for their physicochemical and electrochemical characterizations. All BPMs with IL (PEG) were evaluated from current–voltage (I–V) curves and water dissociation efficiency. The experimental results proved the excellent catalytic activity of PEG for water dissociation, which further improved with its MW. Furthermore, electrodialysis with bipolar membrane (EDBPM) experiments confirmed the occurrence of water dissociation at BPM interface and thus formation of acid and base.