Add time:09/29/2019         Source:sciencedirect.com

A Z-scheme g-C3N4/V2O5 heterostructure was freshly applied to the removal of indoor noxious gases. In addition, to continuously remove noxious organic gases with minimal photocatalyst loss in a steady-flow chamber, the Z-scheme g-C3N4/V2O5 photocatalytic system having a three-dimensional monolithic structure was realized by immobilizing the photocatalytic nanocomposite powder into a melamine sponge. The g-C3N4/V2O5 monolith (CN/VOM) exhibited the best photocatalytic capability, followed in order by the g-C3N4 and V2O5 ones; specifically, the nonanaldehyde removal efficiency over the CN/VOM photocatalyst was as high as 97% under certain experimental conditions. The removal efficiency patterns of these three photocatalytic systems were consistent with their photoelectrochemical properties. In addition, a reusability test revealed prominent photocatalytic stability of the CN/VOM system, which was supported by X-ray diffraction analysis of used and unused samples. The good capability and stability of the CN/VOM were ascribable to its elevated charge-separation ability given by the Z-scheme charge transmission process at the interfaces between g-C3N4 and V2O5. The effects of the V2O5 content and the pollutant feed concentration on the CN/VOM photocatalytic performance were also investigated; a Z-scheme process was defined in the removal of gas pollutants over these CN/VOM systems. This study demonstrates that improved photocatalytic performance of designed materials in the removal of model pollutants can expedite the development of upcoming photocatalytic systems for the continuous removal of noxious organic gas gases without significant photocatalyst losses.

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