Efficient photodecomposition of gaseous organics catalyzed by titanium(IV) oxide encapsulated in a hollow silica shell with high porosity

Facile Synthesis of Yolk–Shell Nanostructured Photocatalyst with Improved Adsorption Properties and Molecular‐Sieving Properties

“…With modifiable properties and multi‐functionalities, the yolk–shell nanostructure has been considered as an intriguing platform material for the design and fabrication of intelligent catalysts . Regarding yolk–shell nanostructures encapsulating a TiO 2 photocatalyst as the core, some pioneering work was done by Ikeda et al., who constructed rattle‐like TiO 2 @SiO 2 composite in which TiO 2 nanoparticles (NPs) were kept inside the hollow silica by a layer‐by‐layer fabrication technique . The void space between the core (TiO 2 ) and the shell (SiO 2 ) keeps the surface of TiO 2 uncovered and allows the diffusion of small external molecules to the TiO 2 surface, leading to a photocatalytic performance comparable to or even better than naked TiO 2 .…”

Synthesis of nano-sized tungsten oxide particles encapsulated in a hollow silica sphere and their photocatalytic properties for decomposition of acetic acid using Pt as a co-catalyst

“…As a result, the TiO 2 @SiO 2 showed photocatalytic activity as high as that of an intrinsic TiO 2 photocatalyst, and showed size-selectivity for materials to be decomposed, depending on the pore size of the permeable shell. [5][6][7][8] In addition, other features of core-hollow shell structure, such as improvement adsorption properties, high temperature stability of core material and application for cascade reaction, have been reported. [9][10][11] There have been many efforts to modify TiO 2 so as to enable absorption of visible light; an intrinsic TiO 2 photocatalyst shows low photocatalytic activity in normal environments because it shows photocatalytic activity only under UV light due to its large band gap (3.2 eV).…”

Preparation of TiO2‐SiO2 composite photocatalysts for environmental applications

“…It has been shown that the composite exhibits photocatalytic activity for decomposition of relatively small substrates without remarkable reduction in intrinsic activity of bare TiO 2 . These size‐selective photocatalytic properties, which are different from the photocatalytic properties of the usual non‐selective TiO 2 catalysis, will provide the composite a possible application for combination and incorporation in various organic products such as fibers or paints, since it will not react with the molecules of those products . Furthermore, silica dioxide slows the recombination phenomenon .…”