4.6 Article

Porous g-C3N4/TiO2 foam photocatalytic filter for treating NO indoor gas

Journal

ENVIRONMENTAL SCIENCE-NANO
Volume 8, Issue 6, Pages 1571-1579

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1en00318f

Keywords

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Funding

  1. Natural Science Foundation of Anhui Province [KJ2018A0571]
  2. Education Ministry Key Lab of Resource Chemistry [00007908]
  3. PhD research start-up foundation of Bengbu University [BBXY2018KYQD21]
  4. National Natural Science Foundation of Chin [21876113, 21677099, 21261140333]

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g-C3N4/TiO2 heterojunction functional foams were constructed as gas purification filters for treating indoor NO gas with high removal rate and stability. The 3D foams' skeletons consisted of g-C3N4 and TiO2 quantum dots, providing excellent adsorption and activation capability for trapping and oxidizing NO molecules.
g-C3N4/TiO2 heterojunction functional foams were constructed as gas purification filters for treating NO indoor gas with a high removal rate (>65%) and high stability under visible-light (lambda >= 400 nm) illumination. The skeletons of the 3D foams consisted of g-C3N4 and TiO2 quantum dots (QDs). Such 3D porous foamy filters provided a large surface area and continuous pores for trapping and oxidizing NO molecules owing to their excellent adsorption and activation capability. The embedded g-C3N4/TiO2 QD heterojunctions in the foam skeletons effectively promoted the separation of photo-generated carriers, allowing the generation of more active species (holes and OH) for oxidizing NO molecules. An oxidation pathway (NO -> NO+ -> NO2- or NO3-) was proposed based on in situ FTIR spectroscopy, which suggested the important role of NO+ for removing NO gas. This work provides an efficient and stable air-purification filter for indoor air treatment.

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