Carbon nitride and titania nanoparticles prepared using porous silica templates and photocatalytic activity

Shoichi Somekawa, Hiroto Watanabe, Yuto Ono, Naoki Tachibana, Hiroaki Imai

Research output: Contribution to journalArticle

Abstract

This work examined the band structure and photocatalytic activity of carbon nitride and titania nanoparticles prepared using porous silica templates with pore sizes of approximately 1 and 3 nm. The carbon nitride and titania specimens prepared in this manner exhibited absorption edge blue shifts compared to bulk samples, due to expansion of their band gap resulting from quantum size effects. The photocatalytic activity of these materials during hydrogen production from water was assessed, and the activity of carbon nitride prepared in the 1 nm pores was higher than that of the material made using 3 nm pores as well as that of the bulk carbon nitride. These results suggest that the expansion of the HOMO-LUMO energy gap contributed to increasing the catalytic performance. In contrast, the titania materials did not generate hydrogen. X-ray absorption fine structure analyses demonstrated that the titania in the silica templates had a distorted structure, which may have decreased its photocatalytic activity.

Original languageEnglish
Article number126600
JournalMaterials Letters
Volume256
DOIs
Publication statusPublished - 2019 Dec 1

Fingerprint

carbon nitrides
Carbon nitride
Silicon Dioxide
templates
titanium
Titanium
Silica
Nanoparticles
silicon dioxide
nanoparticles
porosity
Energy gap
expansion
X ray absorption
hydrogen production
Hydrogen production
blue shift
Band structure
Pore size
Hydrogen

Keywords

  • Carbon nitride
  • Photocatalytic activity
  • Porous silica template
  • Quantum size effect
  • Titania

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Carbon nitride and titania nanoparticles prepared using porous silica templates and photocatalytic activity. / Somekawa, Shoichi; Watanabe, Hiroto; Ono, Yuto; Tachibana, Naoki; Imai, Hiroaki.

In: Materials Letters, Vol. 256, 126600, 01.12.2019.

Research output: Contribution to journalArticle

Somekawa, Shoichi ; Watanabe, Hiroto ; Ono, Yuto ; Tachibana, Naoki ; Imai, Hiroaki. / Carbon nitride and titania nanoparticles prepared using porous silica templates and photocatalytic activity. In: Materials Letters. 2019 ; Vol. 256.
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