Direct microwave synthesis of graphitic C3N4 with improved visible-light photocatalytic activity |
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| Affiliation: | 1. Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, PR China;2. Xizang Key Laboratory of Optical Information Processing and Visualization Technology, School of Information Engineering, Xizang Minzu University, Xianyang 712082, PR China;1. School of Chemical Engineering, Northwest University, Xi’an 710069, PR China;2. Department of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, PR China;3. School of Physics, Northwest University, Xi’an 710069, PR China;1. College of Chemistry, Chemical Engineering, and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China;2. College of Environment and Resources, Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China;1. Advanced Materials Laboratory, ETSIIAA, University of Valladolid, Avenida de Madrid 44, 34004 Palencia, Spain;2. Institute of Catalysis and Petrochemistry, CSIC, Cantoblanco, 28049 Madrid, Spain;1. School of Chemistry and Chemical Engineering/Key Lab. for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, PR China;2. School of Environmental and Chemical Engineering, Xi’an Key Laboratory of Textile Chemical Engineering Auxiliaries, Xi''an Polytechnic University, Xi''an 710048, PR China |
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| Abstract: | The graphitic carbon nitride (g-C3N4) was rapidly synthesized via direct high-energy microwave heating approach. During the preparation process, only low-cost melamine and artificial graphite powders were used, without any metal catalysts or inert protective gas. The microstructure was investigated by using X-ray diffraction (XRD), Flourier transformed infrared (FT-IR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM). The spectra of XRD and HRTEM indicated that the obtained g-C3N4 had a high crystallinity. The optical spectra covering Photoluminescence (PL) and Ultraviolet-visible (UV–vis) were also measured at room temperature. PL peak and UV–vis absorption edge of the g-C3N4 were shown at 455 nm and 469 nm, respectively, indicating visible-light photocatalytic property. Finally, the photocatalytic activity of g-C3N4 was investigated and evaluated as photocatalyst for the photo-degradation of Rhodamine B (RhB) and Methyl Orange (MO) in aqueous solution under visible-light (λ>420 nm) irradiation, respectively. Results indicated that the g-C3N4 sample displayed an excellent performance of removing of RhB and MO due to the improved crystallinity and large surface area of 126 m2/g. After the visible-light photocatalytic reaction for 40 min, the decolorization ratios of RhB and MO reached up to 100% and 94.2%, respectively. |
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| Keywords: | Microwave heating Photocatalyst Rhodamine B Methyl orange |
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