期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 10, 页码 6693-6700出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b00394
关键词
poly(dopamine); multiwall carbon nanotubes; polyethyleneimine; nanocomposite; nanofiltration membrane
资金
- Zhejiang Province Natural Science Foundation [LR15B060001]
- National Basic Research Program of China [2015CB655303]
- National Natural Science Foundation of China [21306163]
- Zhejiang University K. P. Chao's High Technology Development Foundation
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 PBI/PDA-MWCNTs/TMC nanofiltration membrane (M-4) was 15.32 L m(-2) h(-1) bar(-1), which was similar to 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%) approximate to CaCl2, which is well-suited for water softening and heavy metal ion removal,.
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