3 years ago

Facile fabrication of heterostructured bismuth titanate nanocomposites: The effects of composition and band gap structure on the photocatalytic activity performance

Facile fabrication of heterostructured bismuth titanate nanocomposites: The effects of composition and band gap structure on the photocatalytic activity performance
Heterostructured Bi2Ti2O7/Bi4Ti3O12 nanocomposites were successfully synthesized through a facile calcination method. The composition and band gap of the Bi2Ti2O7/Bi4Ti3O12 nanocomposites were controlled by tuning the calcination temperature. The morphology of the Bi2Ti2O7/Bi4Ti3O12 composite changed from worm-like nanosheets to spherical particles when the calcination temperature increased from 500 to 800°C. The structural features of the heterojunction were confirmed using characterization techniques such as XRD, SEM, HRTEM, ESR, and SPV. The Bi2Ti2O7/Bi4Ti3O12 nanocomposite calcined at 600°C had the highest visible light photocatalytic activity, which was almost 2.0 times as high as that of the pure Bi2Ti2O7 for Rhodamine B (RhB) photodegradation, and 2.5 times the rate of 2,4–dichlorophenol (2,4–DCP) removal under simulated sunlight irradiation. The enhanced photocatalytic activity is due to the heterojunction interfaces induced by the match of lattice and energy levels between Bi2Ti2O7 and Bi4Ti3O12, which is helpful for the separation and transfer of electron-hole pairs. The photocatalytic mechanism was elucidated via active species trapping experiments and electron spin resonance. The photogenerated holes played a key role in the degradation reaction via the Bi2Ti2O7/Bi4Ti3O12 composites. Finally, a possible charge transfer mechanism for the enhanced photocatalytic activity was proposed.

Publisher URL: www.sciencedirect.com/science

DOI: S092058611630877X

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.