Citation: Hua LIU, Xue-Chao GAO, Li PENG, Xue-Hong GU. TiO₂ Doping of α-Al₂O₃ Hollow Fiber Membranes for Modulating the Sintering Behavior and Surface Property[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(1): 14-20. doi: 10.11862/CJIC.2022.014 shu

TiO₂ Doping of α-Al₂O₃ Hollow Fiber Membranes for Modulating the Sintering Behavior and Surface Property

State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China

Corresponding author: Xue-Hong GU, xhgu@njtech.edu.cn
Received Date: 28 March 2021
Revised Date: 6 November 2021

Figures(8)

α -Al₂O₃ ceramic hollow fiber membranes were prepared by a combined phase-inversion and sintering method. Effects of TiO₂ doping on sintering behavior and surface property of hollow fiber membranes were investigated extensively. The results showed that a solid reaction between TiO₂ and α-Al₂O₃ could promote the sintering of α - Al₂O₃ hollow fibers. When the doping TiO₂ content (molar fraction) was 1% - 2%, the sintering temperature of hollow fibers could decrease to 1 400 ℃ while the mechanical strength was unchanged. The hydroxyl active sites on the surface of the fibers increased with the doping amount of TiO₂, which was helpful to the growth of the CHA zeolite membrane on the prepared fibers. High-quality CHA zeolite membranes could be prepared on the α-Al₂O₃ hollow fibers doped with a molar fraction of 1%-3% TiO₂, which showed high separation factors above 10 000 for pervaporation dehydration of ethanol/water (9∶1, w/w) mixture.
- TiO₂ doping,
- α-Al₂O₃,
- hollow fiber,
- CHA zeolite membrane
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TiO₂ Doping of α-Al₂O₃ Hollow Fiber Membranes for Modulating the Sintering Behavior and Surface Property