Preparation and Photocatalytic Performance of TiO2-Al2O3 Composite Powder

Abstract

Abstract: The Al₂O₃ ceramic filter membrane is easily clogging by dye macromolecules during the process of filtering dye wastewater, resulting in a decrease in the water flux of the Al₂O₃ ceramic filter membrane. Ti(OH)₄-AlOOH composite sol was prepared by the sol-gel method with butyl titanate and aluminum isopropoxide as precursors, and TiO₂-Al₂O₃ composite powder was obtained by heating at a temperature of 450 ℃. The influence of the molar ratio of Ti(OH)₄ and AlOOH on the particle size distribution of composite sols and the photocatalytic performance of TiO₂-Al₂O₃ composite powders was characterized by using SEM, nanoparticle size/potential meter. The results show that when the molar ratio of Ti(OH)₄ and AlOOH is between 0 and 0.4, the average particle size of the colloidal particles decreases from 67.5 nm to 34.0 nm with the increase of the molar ratio of Ti(OH)₄ and AlOOH, and the Zeta potential of the Ti(OH)₄-AlOOH composite sol increases from 43 mV to 53 mV. When the molar ratio of Ti(OH)₄ and AlOOH is 0.4, the removal rate of crystal violet by composite powder up to 79.3%, and the reaction rate constant increases to 0.018 min^-1. The ceramic membrane prepared by TiO₂-Al₂O₃composite powder can effectively degrade the macromolecules deposited on the surface, and solve the problem of clogging of the ceramic membrane.

Key words: TiO₂-Al₂O₃ composite powder, sol-gel method, ceramic membrane, photocatalysis, degradation, particle size

CLC Number:

O643
X703

DUAN Ning, LI Chongrui, LU Chenglong, ZHANG Yinfeng, ZHANG Xiangtai, XIONG Jiangmin. Preparation and Photocatalytic Performance of TiO₂-Al₂O₃ Composite Powder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4477-4486.

References

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Preparation and Photocatalytic Performance of TiO₂-Al₂O₃ Composite Powder

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