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Preparation and Properties of TiO2/ bentonite Composite Photocatalytic Materials at Room Temperature
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State Key Laboratory of Green Building Materials,China Building Materials Academy

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TB383

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    Abstract:

    In a reaction system using water as the main solvent, the stable TiO2 nanocrystal sol was synthesized under the mild conditions of atmospheric pressure and low temperature (70oC) through the improved sol-gel method with controlling tetrabutyl titanate to fully hydrolyze and slowly polymerize. TiO2/bentonite composite photocatalytic material was further prepared by the loading of TiO2 nanocrystal sol on the surface of bentonite. XRD,SEM and BET were adopted to analyze the structure and morphology of as-prepared samples, and their photocatalytic activities were also investigated. The results show that the high water addition amount is conducive to the formation of TiO2 nanocrystals. When the molar ratio of deionized water: etrabutyl titanate is higher than 167:1, the anatase TiO2 nanocrystals appear in the sol system. TiO2 nanocrystals are mainly loaded on the surface of bentonite rather than embed into the structure between bentonite layers. However, compared with a pure bentonite, the TiO2 loading significantly increases the specific surface area of the material. When the molar ratio of deionized water: etrabutyl titanate is 192:1, the composite photocatalytic material shows the highest photocatalytic activity under UV light, and the degradation rate of methylene blue can reach to 93.8%.

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[Wu Chunli, Shen Qianhong, zhangjinjun, wanglan. Preparation and Properties of TiO2/ bentonite Composite Photocatalytic Materials at Room Temperature[J]. Rare Metal Materials and Engineering,2020,49(4):1268~1272.]
DOI:10.12442/j. issn.1002-185X. SG20190063

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History
  • Received:April 26,2019
  • Revised:August 09,2019
  • Adopted:October 14,2019
  • Online: May 07,2020
  • Published: