接枝改性SAMS-CMC-CS双极膜及在电合成高铁酸盐中的应用  

Preparation of SAMS-CMC-CS Bipolar Membrane and its Application in Electro-Generating FeO_4^(2-)

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

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《高校化学工程学报》2008年第2期265-269,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：福建省自然科学基金(D0710009);福建省高教项目(2007F5032)

摘　　要：采用双阴极室隔膜电解槽,以SAMS-CMC-CS双极膜为隔膜,多孔圆筒铸铁为阳极,结合变频不对称脉冲方波技术电合成高铁酸盐。扫描电镜观察,膜的截面形貌。FT-IR分析表明膜中含有-SO3-、-COO-、-N=CHR官能团。膜特性研究表明:该膜溶胀度较小,可有效地阻止FeO42-向阴极室扩散还原。双极膜中的水解离后产生的OH-及时地传输入阳极室中,以补充电生成FeO42-时消耗的OH-。电解6h,平均电流效率64.1%。The sodium allyl methyl sulphonate（SAMS） was grafted onto the carboxymethylcellulose（CMC）,and then the SAMS-CMC-CS bipolar membrane（BM） was prepared and applied as the septa in a cylindrical electrolysis cell for the electro-generating FeO4^2-.Besides the BM septa,the cylindrical electrolysis cell was constructed with two concentric cylindrical cathodes made of stainless steel and a centric anode made of porous cast iron.The cross-section view of BM prepared was studied by SEM,and the FT-IR spectra indicate that the prepared BM contains–SO3^-,-COO^- and -N=CHR functional groups.Comparing with CMC-CS BM,the SAMS-CMC-CS BM prepared is higher in mechanical strength and better in chemical stability in the alkali solution with [OH]≥ 9.5 mol·L^-1.During the electrochemical generation of FeO4^2-,since the SAMS-CMC-CS BM can effectively prevent the diffusion of FeO4^2- into cathode chamber and supply the consumed OH^- ,the average current efficiency of 64.1% can be reached after 6 h of electrolysis with the using of unsymmetrical square pulse with fluctuating frequency.

关 键 词：双极膜(BM) 甲基烯丙基磺酸钠(SAMS) 壳聚糖(CS) 羧甲基纤维素(CMC) 胶体滴定 高铁酸盐(FeO42-) 

分 类 号：O648.225[理学—物理化学] TQ151.41[理学—化学]