光催化
材料科学
整体
多孔性
锐钛矿
化学工程
胶体
介孔材料
纳米技术
纳米颗粒
纳米复合材料
多孔介质
光降解
复合材料
化学
有机化学
催化作用
工程类
作者
Elodie Layan,Juhi Gupta,Isabelle Ly,Frédéric Nallet,Ahmed Bentaleb,Eric Laurichesse,R.A.L. Vallée,Jean-Luc Blin,Bénédicte Lebeau,Frédéric Louërat,Mickaël Le Béchec,Peter Moonen,Thierry Toupance,Thierry Pigot,Rénal Backov
出处
期刊:Langmuir
[American Chemical Society]
日期:2023-03-06
卷期号:39 (11): 3871-3882
被引量:2
标识
DOI:10.1021/acs.langmuir.2c03062
摘要
Three-dimensional photoactive self-standing porous materials have been synthesized through the integration of soft chemistry and colloids (emulsions, lyotrope mesophases, and P25 titania nanoparticles). Final multiscale porous ceramics bear 700-1000 m2 g-1 of micromesoporosity depending on the P25 nanoparticle contents. The applied thermal treatment does not affect the P25 anatase/rutile allotropic phase ratio. Photonic investigations correlated with the foams' morphologies suggest that the larger amount of TiO2 that is introduced, the larger the walls' density and the smaller the mean size of the void macroscopic diameters, with both effects inducing a reduction of the photon transport mean free path (lt) with the P25 content increase. A light penetration depth in the range of 6 mm is reached, thus depicting real 3D photonic scavenger behavior. The 3D photocatalytic properties of the MUB-200(x) series, studied in a dynamic "flow-through" configuration, show that the highest photoactivity (concentration of acetone ablated and concentration of CO2 formed) is obtained with the highest monolith height (volume) while providing an average of 75% mineralization. These experimental results validate the fact that these materials, bearing 3D photoactivity, are paving the path for air purification operating with self-standing porous monolith-type materials, which are much easier to handle than powders. As such, the photocatalytic systems can now be advantageously miniaturized, thereby offering indoor air treatment within vehicles/homes while drastically limiting the associated encumbrance. This volumetric counterintuitive acting mode for light-induced reactions may find other relevant advanced applications for photoinduced water splitting, solar fuel, and dye-sensitized solar cells while both optimizing photon scavenging and opening the path for the miniaturization of the processes where encumbrance or a foot-print penalty would be advantageously circumvented.
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