Nanoporous titania membranes for permeation and filtration of organic solutions
Nanoporous titania membranes for permeation and filtration of organic solutions
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DOI：
10.1016/j.desal.2007.09.021
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发表时间：
2008-12
期刊：
影响因子：
9.9
通讯作者：
T. Tsuru;M. Narita;R. Shinagawa;Tomohisa Yoshioka
中科院分区：
文献类型：
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作者：
T. Tsuru;M. Narita;R. Shinagawa;Tomohisa Yoshioka
采用溶胶-凝胶法制备了孔径为1 ~几nm的二氧化钛纳米多孔膜，并将其用于正己烷的渗透。TiO 2膜的己烷通量下降，随着水浓度的增加，这是溶解在己烷从零到几百ppm。正己烷渗透前后的纳米渗透率表征表明，二氧化钛膜的孔结构没有变化。因此，这表明，溶解的水吸附到亲水性的TiO 2表面，并减少了己烷渗透的有效孔径。亚油酸在正己烷溶液中的纳滤中观察到负截留，即亚油酸在透过液中浓缩。负截留率随孔径的减小而增大。
Nanoporous titania membranes, with pore sizes ranging from 1 to several nm, were prepared by sol-gel processing and applied to permeation of hexane as a model nonaqueous solution system. TiO2membranes showed a deceased hexane flux with an increase in water concentration, which was dissolved in hexane from zero to several hundred ppm. Nanopermporometry characterization before and after hexane permeation showed no change in pore structures of TiO2membranes. Therefore, it was suggested that the dissolved water adsorbed to the hydrophilic TiO2surface and reduced the effective pore size for hexane permeation. Negative rejection was observed in nanofiltration of linoleic acid in hexane solutions, that is, the linoleic acid was concentrated in permeate. Negative rejection was enhanced with decreasing pore diameter.