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Effect of g-C3N4 nanostructure on adsorption of Methylene Blue
Poster Presentation
Authors
1Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University, Semnan, Iran, 35131-19111
2a Department of Nanotechnology, Faculty of New Sciences and Technologies, Semnan University, Semnan, Iran, 35131-19111
Abstract
The synthesis of nanostructured adsorbents for the removal of pollutants plays an important role in improving the environment. In the present study, bulk graphitic carbon nitride (b g-C3N4) was synthesized by simple thermal polymerization using urea in a muffle furnace at 550 0C for 4h with a heating rate of 2.3 0C/min. Also, the nano sheet (ex g-C3N4) were prepared by exfoliation of bulk sample with thermal oxidation of the bulk g-C3N4 was placed in the open alumina crucible unlike bulk sample and was heated at 520 oC for 2h with a ramp rate of 5 oC/min. In the X-ray diffraction patterns of b g-C3N4 and ex g-C3N4, both of them showed two distinct diffraction peak at 13.1 and 27.4o are indexed to the (100) and (002) peaks for graphitic materials. Although, the intensity of peak at 13.1o for exfoliated sample was decreased. The peak at 13.1o was related to the carbonate nitride layer structure. This means that graphitic carbon nitride was properly peeled off during the peeling process and a layer structure was gone. Furthermore, the peak at 27.4o was indicated the presence of aromatic structures in the system. The crystal structure of two synthesized samples can be further confirmed by FTIR. Both samples (0.3 g/lit) have been investigated for adsorption of methylene blue (5 ppm). After 20 minutes, efficiency of adsorption of methylene blue by ex g-C3N4 was 2.7 times higher than b g-C3N4. The superior efficiency of ex g-C3N4 proves that nanostructure could effectively address the limitation of bulk g-C3N4 suffering from its low specific surface area.
Keywords