4.7 Article

Facile synthesis of the Z-scheme graphite-like carbon nitride/silver/silver phosphate nanocomposite for photocatalytic oxidative removal of nitric oxides under visible light

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 588, Issue -, Pages 110-121

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.12.063

Keywords

Z-scheme g-C3N4/Ag/Ag3PO4; 3D porous structure; Salt template; Photocatalytic oxidation NO removal

Funding

  1. National Natural Science Foundation of China [51578288]
  2. Jiangsu Province Scientific and Technological Achievements into a Special Fund Project [BA2017095]
  3. Fundamental Research Funds for the Central Universities [30919011220]

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A novel ternary Z-scheme photocatalyst was designed and prepared, showing high efficiency in removing nitrogen oxides; the enhanced performance is attributed to the Z-scheme heterojunction structure, which improves the oxidation-reduction performance and light-harvesting capability of the photocatalyst; the catalyst exhibits good cycling stability and visible-light photocatalytic activity.
In this study, a novel ternary Z-scheme Graphite-like Carbon Nitride (g-C3N4)/Silver (Ag)/Silver Phosphate (Ag3PO4) photocatalyst was designed and prepared using a two-step method (sodium chloride (NaCl) template-assisted strategy plus selective deposition). Its photocatalysts performance against removing 400 ppm of Nitric Oxides (NOx) was then investigated. We found 50 wt% g-C3N4/Ag/Ag3PO4 (AP-CN 2:1) catalyst removes up to 74% of NO in 90 min under the illumination of visible light (>420 nm), which is respectively 3.5 and 1.8 times higher than using g-C3N4 or Ag3PO4 , alone. This improved performance was attributed to the formation of Z-scheme g-C3N4/Ag/Ag3PO4 heterojunction, driven by the built-in electric field across the g-C3N4/Ag/Ag3PO4 interface. These separated the electron-hole but enhanced the original strong oxidation and reduction performance of related components. The superior performance is also attributed to the improved surface area, enhanced hydrophilicity (H2O2) and better visible-light-harvesting capability of the composite compound. More importantly, the AP-CN 2:1 sample maintained a NO removal rate of more than 73% even after four rounds of recycling. The photocatalytic oxidation removal mechanism was evaluated using the radical-capture experiments, electron spin resonance (ESR) and ion-exchange high-performance liquid chromatography (HPLC) analysis. The findings of this work offer a simple but effective design of a highly reactive and practical ternary Z-scheme heterojunction photocatalysts for the removal of toxic NO. (C) 2020 Published by Elsevier Inc.

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