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| ZrO2–Al2O3 composite hollow fiber ultrafiltration membranes were prepared by filtration technique and sol-gel process using aluminium iso-propoxide and zirconyl chloride as raw materials. Characterization for membranes was performed by means of XRD, FT-IR spectroscopy, BET, SEM and gas permeation testing. The crystal phase of composite membranes is tetragonal ZrO2 from700℃ to 1100℃, and the thermal stability of composite membranes is greatly improved，compared to pure Al2O3 or ZrO2 membranes. SEM observation showed that the membranes are defect-free. Nitrogen isothermal absorption measurement presented that the most concentrative pore diameters are about 4.3 nm when the mole ratios of Al2O3/ZrO2 change from 4 to 0.05, and the pore size distributions are narrow. As a result, ZrO2–Al2O3 composite membranes can be developed as a method to secure the membrane from cracking in preparation process and high temperature applications. |
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| Keywords:ZrO2 –Al2O3 composite hollow fiber ultrafiltration membranes, preparation, sol-gel process, filtration technique, thermal stability |
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