期刊
JOURNAL OF MEMBRANE SCIENCE
卷 611, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2020.118333
关键词
Hollow silica; Polyamide; Nanofiltration; Interfacial polymerization; Antifouling
资金
- Taiwan's Ministry of Science and Technology [MOST 107-2221-E-197-014, MOST 108-2622-E-197-011-CC3]
Spherical, cubic, or rodlike hollow silica nanoparticles were embedded in nanofiltration polyamide membranes. Each nanoparticle was separately added to an n-hexane solution of trimesoyl chloride, which was reacted with piperazine through interfacial polymerization. The modified membranes exhibited higher hydrophilicity. Field emission scanning electron microscopy depicted less aggregation in the case of the embedded spherical silica nanoparticles, on account of the smallest dimensions. Moreover, the corresponding modified membrane delivered the greatest water flux. The weight ratio of the spherical nanoparticles to trimesoyl chloride was established to be optimum at 0.5, at which the membrane yielded a pure water flux of 90 +/- 3 L/m(2) h (6 bar), and the rejection of different salts followed this trend: Na2SO4 (92%) > MgSO4 (70%) > MgCl2 (14%) > NaCl (11%). Therefore, the shape of hollow silica nanoparticles exerts an influence on the separation efficiency of the modified nanofiltration membranes.
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