Abstract
Heterojunctions have attracted considerable attention for efficiently utilizing solar energy and improving conversion efficiency during pollutant degradation. Herein, carbon nitride and hematite (α-Fe2O3) are used to prepare a Z-scheme 2D/2D α-Fe2O3/g-C3N4 heterojunction using an impregnation-hydrothermal method. The unique 2D/2D structure has a high interfacial area and widely-dispersed active sites. The energy band structure of the Z-scheme heterojunction leads to broad visible-light absorption and promotes charge transfer. Optimizing the content of the α-Fe2O3 precursor in composite leads to a maximum efficiency of 60.8% for the removal of 600 ppb of NO, which is approximately 1.78 times that of g-C3N4 (34.2%). The photocatalytic performance is greatly promoted because of the formation of the heterojunction and the strong interfacial action between g-C3N4 nanosheets and α-Fe2O3 nanoplates. Cycling experiments verify that the α-Fe2O3/g-C3N4 heterojunction has good stability and reusability. The α-Fe2O3/g-C3N4 heterojunction therefore has great potential in sustainable and efficient pollutant degradation.
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