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In situ synthesis of bifunctional TiO2–CsxWO3 composite particles with transparent heat shielding and photocatalytic activity

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Abstract

TiO2–CsxWO3 composite particles with mesoporous structure were synthesized in situ via a template-free solvothermal method followed by heat treatment under a hydrogen atmosphere. The effects of the Ti/W molar ratio on the microstructure, transparent thermal insulation, and adsorption/photocatalytic properties of the composite particles were investigated. The introduction of a small amount of n-butyl titanate in the solvothermal reaction solution could induce the formation of mesoporous TiO2–CsxWO3 composite nanoparticles with a particle size of less than 30 nm. With increasing Ti/W molar ratio, the specific surface area of the TiO2–CsxWO3 particles increased, and the crystalline phase was transformed from Cs0.3WO3 to Cs0.32WO3 and gradually to Cs0.2WO3 with a small amount of emerging Ti3O5 crystals. In comparison with the pure CsxWO3 and CsxWO3@TiO2 composite particles with TiO2 coated on CsxWO3, the as-synthesized TiO2–CsxWO3 composite particles in situ showed excellent adsorption/photocatalytic properties for rhodamine B. The mesoporous structure of the composite particles and the good synergistic effect between TiO2 and CsxWO3 greatly improved the adsorption/photocatalytic performance. When the Ti/W ratio was 0.4, TiO2–CsxWO3 particles had the highest adsorption/photocatalytic degradation efficiency for rhodamine B and excellent visible light transmission and near-infrared shielding properties. The results of this work are important for the research and development of nanoparticles with transparent thermal insulation, self-cleaning, and environmental protection functions to alleviate the current building energy consumption and pollutant emissions.

Graphical abstract: In situ synthesis of bifunctional TiO2–CsxWO3 composite particles with transparent heat shielding and photocatalytic activity

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Article information


Submitted
16 Sep 2019
Accepted
20 Nov 2019
First published
21 Nov 2019

CrystEngComm, 2020, Advance Article
Article type
Paper

In situ synthesis of bifunctional TiO2–CsxWO3 composite particles with transparent heat shielding and photocatalytic activity

J. Yang, J. Liu, Y. Qiao, F. Shi, S. Ran, Y. Dong and S. Liu, CrystEngComm, 2020, Advance Article , DOI: 10.1039/C9CE01457H

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