期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 34, 页码 22574-22584出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07196
关键词
CNT; polyaniline; membrane; electro-oxidation; electroconductive; methylene blue; in situ cleaning
资金
- BARD
- United States Israel Binational Agricultural Research and Development Fund
- Vaadia-BARD Postdoctoral Fellowship Award [FI-497-2014]
- National Science Foundation [1553756]
- Directorate For Engineering [1553756] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1553756] Funding Source: National Science Foundation
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.
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