Preparation and characterization of the continuous titanium-doped ZrO2 mesoporous fibers with large surface area
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The continuous titanium-doped ZrO2 mesoporous fibers with a large surface area (190 m2 g−1, TZ50-400) have been prepared by the sol–gel method coupled with the chemical template route. In the formation process, the self-induced acid environment of ZrOCl2·8H2O in ethanol solution was utilized to avoid a rapid hydrolysis process and the viscous sol precursors were successfully obtained for spinning fibers. X-ray photoelectron spectroscopy and UV–vis diffuse reflectance spectra were used to study the chemical environment of surface Ti(IV) and Zr((IV)) ions. The findings disclose that the partial Ti atoms (less than 30 %) enter into the ZrO2 lattice and occupy the positions of Zr atoms, while the excess Ti atoms construct the linear Ti–O–Ti chains inside the extra framework, being favorable to prevent the collapse of meso structure.
KeywordsZirconia mesoporous fibers Sol–gel Hydrolysis-condensation process Dry-spinning
The authors gratefully appreciate the financial support from Hebei Provincial Natural Science Foundation (E2013210036, E2012210015), National Natural Science Foundation(51102172), the Nature Science Foundation of Hebei Education Department (No.Y 2011112) and National key laboratory open project fund (SKL201105SIC) .