期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 219, 期 -, 页码 222-229出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2019.03.031
关键词
Niobate nanosheet membrane; Hydrothermal method; Exfoliation method; Nanofiltration; Water treatment
资金
- JSPS KAKENHI [JP16K06829]
- Kurita Water and Environment Foundation [16A078]
Niobate nanosheet membranes were fabricated by vacuum filtration using niobate nanosheets prepared by the hydrothermal method (HT-NbO membranes) and the exfoliation method (EX-NbO membranes). Membrane structure, water permeance and separation performance for these membrane types were measured and compared. Both membrane types had a dense structure and retained high structural stability in water via chemical cross-linking between sheets. The difference of the intercalated molecules and interaction between nanosheets affected the interlayer distance of the membranes. As a result, higher water permeance but lower rejection of polyethylene glycol, Na2SO4 and Acid Red 265 was observed for EX-NbO membranes than for HT-NbO membranes. This is due to the formation of larger nanochannels in EX-NbO membranes. A model of a water pathway through nanochannels based on void structure proposed for the HT-NbO membranes can also be applied for EX-NbO membranes.
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