High-Flux Positively Charged Nanocomposite Nanofiltration Membranes Filled with Poly(dopamine) Modified Multiwall Carbon Nanotubes

作者：Zhao, Feng-Yang; Ji, Yan-Li; Weng, Xiao-Dan; Mi, Yi-Fang; Ye, Chun-Chun; An, Quan-Fu^*; Gao, Cong-Jie

来源：ACS Applied Materials & Interfaces, 2016, 8(10): 6693-6700.

DOI：10.1021/acsami.6b00394

• poly(dopamine)
• multiwall carbon nanotubes
• polyethyleneimine
• nanocomposite
• nanofiltration membrane

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,.

• 出版日期2016-3-16
• 单位杭州水处理技术研究开发中心有限公司; 浙江大学