High-Flux Positively Charged Nanocomposite Nanofiltration Membranes Filled with Poly(dopamine) Modified Multiwall Carbon Nanotubes
| Autor: | Yan-Li Ji, Congjie Gao, Yi-Fang Mi, Xiao-Dan Weng, Chun-Chun Ye, Feng-Yang Zhao, Quan-Fu An |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Aqueous solution Nanocomposite 02 engineering and technology Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Chloride 0104 chemical sciences law.invention Membrane Polymerization Chemical engineering law Polyamide Polymer chemistry medicine General Materials Science Nanofiltration 0210 nano-technology medicine.drug |
| Zdroj: | ACS Applied Materials & Interfaces. 8:6693-6700 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.6b00394 |
| Popis: | The poor dispensability of pristine carbon nanotubes in water impedes their implications in thin-film nanocomposite membranes for crucial utilities such as water purification. In this work, high-flux positively charged nanocomposite nanofiltration membranes were exploited by uniformly embedding poly(dopamine) modified multiwall carbon nanotubes (PDA-MWCNTs) in polyamide thin-film composite membranes. With poly(dopamine) modification, fine dispersion of MWCNTs in polyethyleneimine (PEI) aqueous solutions was achieved, which was interracially polymerized with trimesoyl chloride (TMC) n-hexane solutions to prepare nanocomposite membranes. The compatibility and interactions between modified MWCNTs and polyamide matrix were enhanced, attributed to the poly(dopamine) coatings on MWCNT surfaces, leading to significantly improved water permeability. At optimized conditions, pure water permeability of the PEI/PDA-MWCNTs/TMC nanofiltration membrane (M-4) was 15.32 L m(-2) h(-1) bar(-1), which was ∼1.6 times increased compared with that of pristine PEI/TMC membranes. Salt rejection of M-4 to different multivalent cations decreased in the sequence ZnCl2 (93.0%)MgCl2 (91.5%)CuCl2 (90.5%) ≈ CaCl2, which is well-suited for water softening and heavy metal ion removal. |
| Databáze: | OpenAIRE |
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