羧甲基纤维素-壳聚糖双极膜的制备及其在电合成高铁酸盐中的应用  

Preparation of CS-CMC bipolar membrane and its application in electro-generation of FeO_4^(2-)

作　　者：任羽西[1] 陈力勤[2] 陈日耀[1] 郑曦[1] 陈震[1] 

机构地区：[1]福建师范大学化学与材料学院,福州350007 [2]福建师范大学学报编辑部,福州350007

出　　处：《膜科学与技术》2007年第6期72-76,共5页Membrane Science and Technology

基　　金：福建省发改委项目(DH-361);福建省计委项目(JH-006)

摘　　要：分别采用戊二醛和三价铁离子改性壳聚糖和羧甲基纤维素,制备了CS-CMC聚合物双极膜,并被用于电解法制备水处理剂高铁酸盐.经IR分析表明,该聚合物膜两极分别含有N CHR、—COO—官能团.CS-CMC双极膜的溶胀率较小,能稳定存在于浓酸、浓碱溶液中.在电极上迭加变频不对称脉冲方波可及时去除阳极表面的氧化膜.在14 mol/L的NaOH溶液中,室温下以5 mA/cm2的电流密度、脉冲方波频率2 Hz,电解6 h,电流效率平均为51.27%,高铁酸盐浓度达到37 mmol/L.The CS- CMC bipolar membrane （BM） was prepared by using of the modified chitosan and carboxymethylcellulose, and was used as the septum of the cylinder electrolytic bath for the electro- generation of ferrat. The FT- IR spectrum analysis show that the two poles of the CS- CIVIC BM contained -N=CRH2^＋ and -COO functional groups, respectively. The swelling characteristic of the CS- CMC BM was improved. Compared to CS and CIVIC membranes, the CS- CMC BM was also more stabile in both strong acid and base solutions. The oxide layer on the east iron anode could be removed by applying a asymmetrical square wave to the electrode. The ferrate concentration reached 37.0 mmol/L in 14 mol/L NaOH solution under the conditions of current density of 5 mA/cm^2, frequency of square wave pulse of 2 Hz, electrolysis time of 6 hours, average current efficiency of 51.2 % and at room temperature.

关 键 词：双极膜 壳聚糖 羧甲基纤维素 胶体滴定 高铁酸盐 

分 类 号：TQ138.1[化学工程—无机化工]