Investigation of titania membranes for nanofiltration
- Univ. of Wisconson, Madison, WI (United States); and others
The development of ceramic membranes for industrial scale separations is receiving increased attention because of the numerous potential benefits that these inorganic membranes offer over their organic counterparts. These benefits include increased thermal stability, ability to operate over a broader range of pH values, and increased resistance to organic solvents. One method for the synthesis of ceramic membranes involves sol-gel techniques. Titania sols have been fabricated which are characterized by mean particle diameters of ca. 8 nm. Membranes fabricated from these sols are characterized by pore diameters of approximately 15 {angstrom}. Permselectivity measurements of these titania membranes indicate that their molecular weight cut-off value is less than 200. Rejection coefficients for several molecular species increased with increasing applied pressure in a manner which was not predicted from theoretical considerations. Rejection coefficients for several nitrate salts and permeability data for selected non-aqueous solvents were measured. Rejection coefficients for cupric and zinc nitrate salts were approximately 25%.
- OSTI ID:
- 213093
- Report Number(s):
- CONF-940713--
- Country of Publication:
- United States
- Language:
- English
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