Simultaneous excitation of PdCl₂ hybrid mesoporous g-C₃N₄ molecular/solid-state photocatalysts for enhancing the visible-light-induced oxidative removal of nitrogen oxides

Zizhong ZHANG, Mukun XU, Wing Kei HO, Xianwen ZHANG, Zhenya YANG, Xuxu WANG

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A simple and efficient molecular/solid-state hybrid photocatalyst consisting of noble metal (i.e., Auᴵᴵᴵ, Ptᴵᵛ, and Pdᴵᴵ) chlorides-functionalized-mesoporous graphitic carbon nitride (mpg-CN) was developed to improve the photocatalytic performance of mpg-CN toward NO removal. Compared with the parent mpg-CN, the optimal 1% PdCl₂ modified mpg-CN increased the conversion efficiency by approximately 33%, improved the inhibiting efficiency of NO₂ release by approximately three times, and promoted the long term stability of photocatalysts for NO removal in a continuous flow model reaction system. The prepared samples were characterized by X-ray diffraction, transmission electron microscopy with energy-dispersive X-ray spectroscopy elemental mapping, ultraviolet–visible light absorbance spectroscopy, X-ray photoelectron spectroscopy, photoluminescence emission spectroscopy and electron paramagnetic resonance spectroscopy. The ultrafast charge separation and efficient generation of O₂•⁻ oxygen species were achieved by the charge transfer model of PdCl₂/mpg-CN similar to the solid-state Z-scheme system. This charge transfer model contributed to the high photocatalytic performance of the prepared PdCl₂/mpg-CN molecular/solid-state hybrid photocatalyst. Copyright © 2015 Elsevier B.V.
Original languageEnglish
Pages (from-to)174-181
JournalApplied Catalysis B: Environmental
Volume184
Early online dateNov 2015
DOIs
Publication statusPublished - May 2016

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Nitrogen Oxides
Carbon nitride
Nitrogen oxides
Photocatalysts
nitrogen oxides
carbon
spectroscopy
X-ray spectroscopy
Charge transfer
Spectroscopy
Photoluminescence spectroscopy
Emission spectroscopy
electron spin resonance
Precious metals
absorbance
Conversion efficiency
Paramagnetic resonance
cyanogen
removal
solid state

Citation

Zhang, Z., Xu, M., Ho, W., Zhang, X., Yang, Z., & Wang, X. (2016). Simultaneous excitation of PdCl₂ hybrid mesoporous g-C₃N₄ molecular/solid-state photocatalysts for enhancing the visible-light-induced oxidative removal of nitrogen oxides. Applied Catalysis B: Environmental, 184, 174-181.

Keywords

  • mpg-CN
  • PdCl₂ hybrid
  • Z-scheme
  • NO removal
  • Photocatalysis