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Coupling of Ag2CO3 to an optimized ZnO photocatalyst: Advantages vs. disadvantages
摘要： With the aim of improving the photocatalytic properties of a previously optimized zinc oxide photocatalyst, the effect of the incorporation of different amounts of Ag2CO3 on the aforementioned ZnO has been studied. For this purpose we report the synthesis, by means of simple precipitation procedures, of bare ZnO and Ag2CO3 samples as well as the coupled materials ZnO/Ag2CO3 (X) (where X = 1%, 2%, 4% and 5% in molar percentages). Both, single and coupled materials have been characterized by different techniques (XRD, XRF, N2-absorption, SEM, TEM, UV–vis/DRS and XPS). To assess the advantages or disadvantages that Ag2CO3 addition could have over the optimized ZnO, the photocatalytic properties have been established by following the photo-degradation of selected toxic molecules, both in the UV and in the visible, as well as using complementary techniques of liquid medium analyses (TOC and Atomic Emission Spectrometry with plasma ICP). Three selected substrates were chosen: Rhodamine B (RhB) as a dye, and phenol and caffeine as colourless recalcitrant toxic molecules.
关键词： Visible-Photocatalysis,Zinc oxide,Dyes,Ag2CO3,Caffeine,Phenol
更新于2025-09-11 14:15:04
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Construction of Ternary rGO/Ag <sub/>2</sub> CO <sub/>3</sub> /AgBr Heterostructured Photocatalyst for Improved Photocatalytic Activity and Stability
摘要： Novel ternary rGO/Ag2CO3/AgBr heterostructured photocatalyst have been successfully fabricated through in-situ anion exchange synthesis route. The morphology, crystal structure, component and optical property of the as-obtained products were fully characterized by various technologies. The photocatalytic performances of the as-obtained products were measured by degrading rhodamine B (RhB) under visible light irradiation. The rGO/Ag2CO3/AgBr heterostructured photocatalyst exhibits higher photocatalytic activity than that of the pure Ag2CO3 and rGO/Ag2CO3, indicating the presence of a synergic effect between three components. The superior photocatalytical activity for the rGO/Ag2CO3/AgBr heterostructured photocatalyst is due to the formation of multi-heterojunction with rGO acting as electron mediation, which facilitate the separation of photogenerated electron and hole pairs. The possible transfer path of photogenerated carriers and mechanism for the improved photocatalytic activity are also supposed.
关键词： AgBr,Ternary Heterojunction,Ag2CO3,Photocatalysis,Visible Light Driven
更新于2025-09-09 09:28:46