Photocatalytic Activity of Multicompound TiO2/SiO2 Nanoparticles

Abstract

Multicompound TiO2/SiO2 nanoparticles with a diameter of 50–70 nm were generated using a liquid flame spray (LFS) nanoparticle deposition in a single flame. Here, we study the photocatalytic activity of deposited multicompound nanoparticles in gas-phase via oxidation of acetylene into carbon dioxide that gives new insight about the multicompound nanoparticle morphology. A small addition of SiO2 content of 0.5%, 1.0% and 3.0% significantly suppressed the photocatalytic activity by 33%, 44% and 70%, respectively, whereas 5.0% SiO2 addition completely removed the activity. This may be due to a formation of a thin passivating SiO2 layer on top of the of the TiO2 nanostructures during the LFS nanoparticle deposition. Surface wetting results support this hypothesis with a significant increase in water contact angle as the SiO2 content is increased.

Surface modification of TiO2nanoparticles with organic molecules and their biological applications

“…In 2021, Temerov et al synthesized TiO 2 NPs@SiO 2 (50–70 nm) using a liquid flame spray (LFS) deposition method in a single flame environment. 30 They studied the photocatalytic activity of deposited TiO 2 NPs@SiO 2 for oxidation of acetylene into carbon dioxide and they investigated the effect of the silica shell on the photocatalytic activity of these modified TiO 2 NPs. They reported that the catalytic activity was significantly suppressed when the SiO 2 content was increased to 0.5%, 1.0%, 3.0% and 5.0% (33%, 44%, 70% and 100% of suppression, respectively).…”

Block Copolymer and Cellulose Templated Mesoporous TiO2-SiO2 Nanocomposite as Superior Photocatalyst

“…This could be avoided by incorporating silica (SiO 2 ) into the titania matrices [14,[23][24][25]. Silica insertion into the TiO 2 nanostructure not only increases the thermal stability of the highly photoactive anatase phase but also helps to prevent the mesoporous structure from collapsing [2,[26][27][28]. Introducing cellulose matrix as the second templating media to the triblock copolymer-TiO 2 -SiO 2 composite could further enhance the specific surface area and support the mesoporous structure with a higher degree of dispersibility in aqueous media that would enhance the photocatalytic efficiency [29].…”

Fluorescent carbon quantum dots with controllable physicochemical properties fantastic for emerging applications: A review

“…[ 267–269 ] Leveraging the UCPL properties of CQDs, they can convert visible light to shorter wavelength light (325–425 nm) for the excitation of TiO 2 , thus exciting TiO 2 to generate additional electron/hole pairs for various photocatalytic reactions. This has been supported by improvements in photocurrent, photoelectric conversion efficiency, [ 270,271 ] and enhanced interfacial charge migration between CQDs and TiO 2 . [ 272,273 ]…”