Excellent visible light photocatalytic efficiency of Na and S co-doped g-C3N4 nanotubes for H2 production and organic pollutant degradation |
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| Affiliation: | 1. Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology, School of Materials Science and Engineering, Xi''an University of Technology, Xi''an, 710048, ShaanXi, People''s Republic of China;2. School of Science, State Key Laboratory for Mechanical Behavior of Materials, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Xi''an Jiaotong University, Xi''an, 710049, ShaanXi, People''s Republic of China;1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, PR China;2. College of Chemistry and Chemical Engineering, Henan Province Key Laboratory of Utilization of Non-metallic Mineral in the South of Henan, Xinyang Normal University, Xinyang 464000, PR China;1. School of the Environment and Safety Engineering, Jiangsu University, China;2. Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;3. Key Laboratory of Preparation and Applications of Environmental Friendly Materials, Jilin Normal University, Ministry of Education, Changchun 130103, China;4. School of Materials and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;1. School of Mechanical and Transportation Engineering, Guangxi University of Science and Technology, Liuzhou 545616, PR China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;3. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada;4. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China |
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| Abstract: | Na and S co-doped g-C3N4 nanotubes (NaxSCNNTs) were synthesized via thermal polymerization using NaHCO3 and thiourea as Na and S source, respectively. The co-doping of Na and S in g-C3N4 nanotubes was verified by FTIR, SEM elemental mapping and XPS measurements. After loading Pt, the optimal Na0.1SCNNT produced H2 at a rate of 173.7 μmol h−1, which is 1.76 times and 14 times of that of Na0SCNNT and bulk g-C3N4, respectively. Moreover, the performance of Na0.1SCNNT was increased by 50% after replacing Pt with PtCo. The apparent quantum efficiency of Na0.1SCNNT/Pt and Na0.1SCNNT/PtCo were 6.7% and 10.2% at λ = 420 nm, respectively. Na0.1SCNNT also displayed the best photocatalytic activity for both p-chlorophenol and rhodamine B degradation, which are 3.1 and 3.4 times of that of bulk g-C3N4, respectively. Cyclic photocatalytic experiments demonstrated the high stability of Na0.1SCNNT. The enhanced photocatalytic activity of Na0.1SCNNT is resulted from the large specific surface area, narrowed bandgap, enhanced visible light absorption, and down-shifted valance band, which are supported by steady-state PL spectra and time-resolved transient PL decay, as well as photoelectrochemical analysis. Finally, the possible photocatalytic mechanisms for H2 production, and degradation of rhodamine B and p-chlorophenol are proposed. |
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| Keywords: | Na and S co-doping Hydrogen Photocatalysis p-chlorophenol |
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