Preparation of PVA-GA-CS/PVA-Fe-SA bipolar membrane and its application in electro-generation of 2,2-dimethyl-3-hydroxypropionic acid
Preparation of PVA-GA-CS/PVA-Fe-SA bipolar membrane and its application in electro-generation of 2,2-dimethyl-3-hydroxypropionic acid
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DOI：
10.1016/j.memsci.2007.09.034
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发表时间：
2008-01
影响因子：
9.5
通讯作者：
Cai-Xia Xu;Riyao Chen;Xi Zheng;Xiao Chen;Zhen Chen
中科院分区：
文献类型：
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作者：
Cai-Xia Xu;Riyao Chen;Xi Zheng;Xiao Chen;Zhen Chen
采用糊状法制备了PVA-GA-CS/PVA-Fe-SA双极膜。分别用FeCl 3和戊二醛（GA）交联聚乙烯醇-海藻酸钠（SA）和聚乙烯醇-壳聚糖（CS）。用胶体滴定法测定了PVA-CS和PVA-SA溶液的电荷密度。双极膜的溶胀度在25- 85%之间，同时考察了双极膜的渗透性能、离子交换容量和共离子传输性能。采用FTIR对双极膜的官能团进行了分析。此外，BPM横截面的SEM照片示出了由阴离子层（PVA-GA-CS）和阳离子层（PVA-Fe-SA）组成的结构。热重分析表明PVA-GA-CS/PVA-Fe-SA双极膜具有良好的热稳定性。采用PVA-GA-CS/PVA-Fe-SA双极膜作为电解槽的隔膜，电解生产2，2-二甲基-3-羟基丙酸。平均电流效率为52.2%，最高电流效率达68.9%。
PVA-GA-CS/PVA-Fe-SA bipolar membrane was prepared by a paste method. PVA-sodium alginate (SA) and PVA-chitosan (CS) were cross-linked by FeCl3and glutaraldehyde (GA), respectively. The charge densities of PVA-CS and PVA-SA solutions were determined by the colloid titration. The swelling level of bipolar membrane was in the range of 25–85%, meanwhile the permeability and the ion-exchange capacity as well as co-ion transport properties was investigated. FTIR was applied to analyze the functional groups of the bipolar membrane. Furthermore, SEM photographs of the BPM cross-section illustrated a structure that consists of an anion layer (PVA-GA-CS) and a cation layer (PVA-Fe-SA). TG analysis of PVA-GA-CS/PVA-Fe-SA bipolar membranes exhibited a good thermal stability. PVA-GA-CS/PVA-Fe-SA bipolar membranes were used as the separator in the electrolysis cell for electro-generation of 2,2-dimethyl-3-hydroxypropionic acid. The average current efficiency was 52.2%, and the highest current efficiency reached 68.9%.