Synthesis of Photo-Excited ZnO@g-C3N4 Heterojunction and Photocatalytic Methylene Blue Under Visible Light Irradiated
The g-C3N4 was synthesized by thermal polymerization,in which the urea and melamine as the sources.The ZnO@g-C3N4 heterojunction was synthesized by hydrothermal method,in which g-C3N4 as matrix and zinc acetate as zinc sources.The performance of ZnO@g-C3N4 heterojunction was characterized by XRD,SEM,TEM PL and UV/Vis spectrum.The porous multilayer g-C3N4 and ZnO@g-C3N4 materials were synthesized by the results of XRD,SEM and TEM.The ZnO nanoparticles was uniformly dispersed in the surface of g-C3N4.The heterojunction was formed between the ZnO and g-C3N4.The fluorescence intensity of the g-C3N4 was decreased with the increasing of doped ZnOcontent.The heterojunction was formed according the changed fluorescence intensity.The migration of electron holes was accelerated and the recombination rate of electrons holes reduced by the heterojunction.The content of methylene blue was monitored by UV/Vis spectrum which determined by characteristic wavelength 664nm.The methylene blue was thoroughly degraded by ZnO@g-C3N4 whichwas irradiated under visible light.The ZnO@g-C3N4 materials were recycled and reused by centrifugation with ten times.The ZnO@g-C3N4 materials showed high catalytic activity and excellent stability according to the decomposition of methylene blue after recycled and reused several times.
photocatalyticheterojunctionzinc oxideg-C3N4methlene blue
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