Polyaniline-Coated Carbon Nanotube Ultrafiltration Membranes: Enhanced Anodic Stability for In Situ Cleaning and Electro-Oxidation Processes

被引:151
作者
Duan, Wenyan [1 ]
Ronen, Avner [1 ]
Walker, Sharon [1 ]
Jassby, David [1 ]
机构
[1] Univ Calif Riverside, Dept Chem & Environm Engn, Riverside, CA 92521 USA
基金
美国国家科学基金会;
关键词
CNT; polyaniline; membrane; electro-oxidation; electroconductive; methylene blue; in situ cleaning; METHYLENE-BLUE; WATER; COMPOSITE; POLYMERIZATION; PERFORMANCE; OXIDATION; ELECTRODE; ELECTROPOLYMERIZATION; FUNCTIONALIZATION; DEGRADATION;
D O I
10.1021/acsami.6b07196
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Electrically conducting membranes (ECMs) have been reported to be efficient in fouling prevention and destruction of aqueous chemical compounds. In the current study, highly conductive and anodically stable composite polyaniline-carbon nanotube (PANI-CNT) ultrafiltration (UF) ECMs were fabricated through a process of electro-polymerization of aniline on a CNT substrate under acidic conditions. The resulting PANI-CNT OF ECMs were characterized by scanning electron microscopy, atomic force microscopy, a four-point conductivity probe, cyclic voltammetry, and contact angle goniometry. The utilization of the PANI-CNT material led to significant advantages, including: (1) increased electrical conductivity by nearly an order of magnitude; (2) increased surface hydrophilicity while not impacting membrane selectivity or permeability; and (3) greatly improved stability under anodic conditions. The membrane's anodic stability was evaluated in a pH-controlled aqueous environment under a-wide range of anodic potentials using a three-electrode cell. Results indicate a significantly reduced degradation rate in comparison to a CNT-poly(vinyl alcohol) ECM under high anodic potentials. Fouling experiments conducted with bovine serum albumin demonstrated the capacity of the PANI-CNT ECMs for in situ oxidative cleaning, with membrane flux restored to its initial value under an applied potential of 3 V. Additionally, a model organic compound (methylene blue) was electrochemically transformed at high efficiency (90%) in a single pass through the anodically charged ECM.
引用
收藏
页码:22574 / 22584
页数:11
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