期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 58, 期 20, 页码 8772-8783出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.9b00772
关键词
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资金
- National Natural Science Foundation of China [21576068, 21276060, 21276062, 21306039]
- Natural Science Foundation of Tianjin [16JCYBJC19 800]
- Natural Science Foundation of Hebei Province [B2015202082, B2016202027, B2017202056]
- Program for Top 100 Innovative Talents in Colleges and Universities of Hebei Province [SLRC2017029, A2016002027]
Thin film nanocomposite (TFN) membranes were invented in 2007 to enhance the permeability of thin film composite (TFC) membranes. Surface modification of nanofillers was a common method to improve the interaction and compatibility at polymer/nanofiller interfaces. Accordingly, as an amino-functionalized zirconium-based metal-organic framework (MOF), UiO-66-NH2 was synthesized and introduced into the preparation of TFN membranes via interfacial polymerization in this study. The superhydrophilic characteristic of UiO-66-NH2 made it possible to be well dispersed in aqueous solution and the amino groups on particle surfaces could react with 1,3,5-benzenetricarboxylic acid chloride (TMC) to form covalent interaction with polymer thus inhibiting the formation of nonselective defects at PA/nanofiller interfaces. The morphology images and FT-IR spectra revealed the PA selective layer successfully formed on the top of hydrolyzed polyacrylonitrile (HPAN) supports. The EDX characterization demonstrated UiO-66-NH2 nanoparticles were successfully introduced into the TFN membranes. The UiO-66-NH2 nanoparticles increased the surface hydrophilicity and roughness of the membranes, and provided additional passageways for mass transfer. Pure water permeability increased from 6.89 LMH/bar for TFC membrane to 14.55 LMH/bar for TFN-0.10 membrane indicating the distinct permeability elevation after the incorporation of UiO-66-NH2 nanoparticles. And the Na2SO4 rejection of TFN-0.10 membrane was up to about 99.0% and NaCl rejection was 38.1% at 4 bar, which was higher than that of TFN membrane incorporated with pristine UiO-66.
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