Visible-Light Upconversion Carbon Quantum Dots Decorated TiO 2 for the Photodegradation of Flowing Gaseous Acetaldehyde

Yidan Hu, Xiaofeng Xie, Xiao Wang, Yan Wang, Yi Zeng, David Y Pui, Jing Sun

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Carbon-modified photocatalyst has attracted extensive attentions in the field of gaseous pollutant removal, mainly due to the improved adsorption properties and electronic transport of carbon matrix, such as carbon nanotubes, graphene, and fullerene, etc. In this work, carbon quantum dots (CQDs) were employed to enhance the photocatalytic performance of TiO 2 -based composites for flowing gaseous acetaldehyde removal. Besides the aforementioned advantages of carbon materials, the unique up-converted photoluminescence property of CQDs is capable of extending the optical absorption to visible-light range. Moreover, the electron spin resonance (ESR) results firstly verified a stable existence of Ti 3+ defect in the CQDs/TiO 2 composite, which is possibly induced by the electron migration from CQDs to TiO 2 . And the formed Ti 3+ donor energy level in the band gap could further help with the visible-light harvesting. During the photodegradation experiments, with two-hour continuous flowing gaseous acetaldehyde injection (500 ppm, 20 sccm), the CQDs/TiO 2 composite remained 99% removal efficiency under fluorescent lamp irradiation (λ > 380 nm). The optimized CQDs content was obtained as 3 wt%, and the underlying mechanism was further analyzed by temperature programmed desorption (TPD) methods. This work will push forward the air purification researches by providing new insights of CQDs sensitized photocatalyst.

Original languageEnglish (US)
Pages (from-to)266-274
Number of pages9
JournalApplied Surface Science
Volume440
DOIs
StatePublished - May 15 2018

Fingerprint

Acetaldehyde
acetaldehyde
Photodegradation
Semiconductor quantum dots
Carbon
quantum dots
carbon
Photocatalysts
composite materials
Composite materials
air purification
Air purification
Fullerenes
Fluorescent lamps
Carbon Nanotubes
Graphite
Temperature programmed desorption
Graphene
Light absorption
Electron energy levels

Keywords

  • Acetaldehyde removal
  • Carbon quantum dots
  • Photocatalysis
  • Titania
  • Upconversion

Cite this

Visible-Light Upconversion Carbon Quantum Dots Decorated TiO 2 for the Photodegradation of Flowing Gaseous Acetaldehyde . / Hu, Yidan; Xie, Xiaofeng; Wang, Xiao; Wang, Yan; Zeng, Yi; Pui, David Y; Sun, Jing.

In: Applied Surface Science, Vol. 440, 15.05.2018, p. 266-274.

Research output: Contribution to journalArticle

Hu, Yidan ; Xie, Xiaofeng ; Wang, Xiao ; Wang, Yan ; Zeng, Yi ; Pui, David Y ; Sun, Jing. / Visible-Light Upconversion Carbon Quantum Dots Decorated TiO 2 for the Photodegradation of Flowing Gaseous Acetaldehyde In: Applied Surface Science. 2018 ; Vol. 440. pp. 266-274.
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