功能化多壁碳纳米管负载铁离子改性双极膜的制备与表征  

Preparation and Characterization of Bipolar Membranes Modified by Functionalized Multiwalled Carbon Nanotubes Loaded with Fe^(3+)

作　　者：陈晓[1] 陈佳辉[1] 陈日耀[1] 李忠贵[1] 周挺进[2] 刘耀兴[1] 

机构地区：[1]福建师范大学环境科学与工程学院,福建福州350007 [2]厦门大学环境与生态学院,福建厦门361005

出　　处：《高分子材料科学与工程》2017年第4期148-153,共6页Polymer Materials Science & Engineering

基　　金：福建省科技厅重点项目(2012H0019);福州市科技局项目(2012-G-116);福建省自然科学基金资助项目(2013J01034)

摘　　要：分别用未功能化的多壁碳纳米管(MWCNTs)、羟基化多壁碳纳米管(MWCNTs-OH)、羧基化多壁碳纳米管(MWCNTs-COOH)、磺酸基化多壁碳纳米管(MWCNTs-SO3H)改性羧甲基纤维素钠(CMC)-聚乙烯醇(PVA)/壳聚糖(CS)-聚乙烯醇双极膜(BPM)的阳离子交换膜层。采用力学性能分析、接触角测定、电流密度-槽电压曲线等对改性前后双极膜的性能进行表征,并测定了改性前后双极膜中Fe^(3+)的流失量。结果表明,经功能化多壁碳纳米管改性后,双极膜的亲水性和力学性能得到了显著提高。功能化多壁碳纳米管和Fe^(3+)对催化中间界面层水解离有协同作用,大大提高了中间界面层水解离效率,降低了双极膜的膜阻抗和槽电压。此外,改性后双极膜中Fe^(3+)的流失量有了明显的下降,从而保持了双极膜结构和催化水解离性能的稳定性。The cationic exchange layers of the carboxymethyl cellulose （CIVIC）- polyvinyl alcohol （PVA） /chitosan （CS） -polyvinyl alcohol bipolar membranes （BPM） using glutaraldehyde as crolinker and ferric chloride as modifier, were modified by multi-walled carbon nanotubes （MWCNTs）, hydroxylated multi-walled carbon nanotubes （MWCNTs-OH）, carboxylated multi-walled carbon nanotubes （MWCNTs-C）OH） and sulfonated multi-walled carbon nanotubes （MWCNTs-SO3H）, respectively. The mechanical properties, contact angle and electric current densit1cell voltage curve as well as the Fe3＋ loss amount of the CMC-PVA/CS-PVA BPMs before and after modification were compared. The experimental results show that after modification by functionalized multi-walled carbon nanotubes, both the hydrophilicity and mechanical properties of the bipolar membrane are significantly improved. The funetionalized multi-walled carbon nanotubes and Fe3＋ have a synergistic effect on promoting water splitting in the intermediate layer, thus the water splitting efficiency is greatly improved, and the membrane impedance and cell voltage of bipolar membrane are reduced. In addition, functionalized multi-walled carbon nanotubes existed in the bipolar membrane are beneficial for retention rate of Fe3 ＋ in BPMs during electrolysis, and then to maintain the stability of the structure and catalytic performance for water splitting of the BPMs.

关 键 词：双极膜 多壁碳纳米管 水解离 Fe-(3+)流失量 

分 类 号：TB383[一般工业技术—材料科学与工程]