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- W2043137815 abstract "The mechanism of formation of Zr(IV) hydrous oxide membranes deposited under dynamic conditions on a microporous support has been examined. The support was rotated at speeds of 1200 to 2000 rpm, corresponding to a linear velocity of 2.7 to 4.6 m/sec. A small pressure difference across the porous barrier of 0.5 to 0.7 atm was maintained. Observations of the decline of transmembrane flux are consistent with a two-step model of membrane formation comprising: (a) a period of pore clogging and bridging, followed by (b) the thickening of a colloidal cake. Increasing the rate of rotation significantly decreased the filtration constant for both the pore clogging and the cake formation periods, but the time required to begin cake growth remained essentially the same. The rotation velocity also influenced the zirconium rejection, which reached a plateau of 80 to 88% at 1200 rpm and 90 to 95% at 2000 rpm. The selectivity of the dynamically formed Zr(IV) hydrous oxide membrane was tested with a Rhodamine dye solution. Rejections of 85 to 95% were obtained for over 1 hr with essentially constant filtrate flux." @default.
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- W2043137815 date "1979-01-01" @default.
- W2043137815 modified "2023-09-27" @default.
- W2043137815 title "An investigation of the mechanism of dynamic membrane formation on rotating microporous surfaces" @default.
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- W2043137815 doi "https://doi.org/10.1016/0021-9797(79)90267-4" @default.
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