Preparation and photocatalytic activity of g-C3N4/TiO2 heterojunctions under solar light illumination |
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| Affiliation: | 1. National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng, 475004, China;2. Collaborative Innovation Center of Nano Functional Materials and Applications of Henan Province, Henan University, Kaifeng, 475004, China;3. College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China;1. Chongqing Key Laboratory of Environmental Materials & Remediation Technologies, Chongqing University of Arts and Science, Chongqing 402160, PR China;2. Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China;1. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. Shanghai Innovation Institute for Materials, Shanghai 200093, China;1. National & Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials, Henan University, Kaifeng 475004, China;2. Henan Engineering Research Center of Resource & Energy Recovery from Waste, Henan University, Kaifeng 475004, China;1. Nanotechnologyand and Advanced Materials Program, Energy & Building Research Center, Kuwait Institute for Scientific Research (KISR), P.O. Box 24885, Safat 13109, Kuwait;2. Institut für Technische Chemie, Leibniz Universität Hannover, Callinstrasse 3, 30167 Hannover, Germany;3. Water Pollution Research Dept., National Research Centre, 33 EL Bohouth St. P.O. 12622, Dokki, Giza, Egypt;4. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia;5. Central Metallurgical Research and Development Institute, CMRDI, Helwan 11421, Cairo, Egypt;1. Solar Energy Lab, Department of Chemistry, Thiruvalluvar University, Vellore 632 115, India;2. DKM College for Women (Autonomous), Department of Biotechnology, Vellore 632 001, India |
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| Abstract: | The solar light sensitive g-C3N4/TiO2 heterojunction photocatalysts containing 20, 50, 80, and 90 wt% graphitic carbon nitride (g-C3N4) were prepared by growing Titania (TiO2) nanoparticles on the surfaces of g-C3N4 particles via one step hydrothermal process. The hydrothermal reactions were allowed to take place at 110 °C at autogenous pressure for 1 h. Raman spectroscopy analyses confirmed that an interface developed between the surfaces of TiO2 and g-C3N4 nanoparticles. The photocatalyst containing 80 wt% g-C3N4 was subsequently heat treated 1 h at temperatures between 350 and 500 °C to improve the photocatalytic efficiency. Structural and optical properties of the prepared g-C3N4/TiO2 heterojunction nanocomposites were compared with those of the pristine TiO2 and pristine g-C3N4 powders. Photocatalytic activity of all the nanocomposites and the pristine TiO2 and g-C3N4 powders were assessed by the Methylene Blue (MB) degradation test under solar light illumination. g-C3N4/TiO2 heterojunction photocatalysts exhibited better photocatalytic activity for the degradation of MB than both pristine TiO2 and g-C3N4. The photocatalytic efficiency of the g-C3N4/TiO2 heterojunction photocatalyst heat treated at 400 °C for 1 h is 1.45 times better than that of the pristine TiO2 powder, 2.20 times better than that of the pristine g-C3N4 powder, and 1.24 times better than that of the commercially available TiO2 powder (Degussa P25). The improvement in photocatalytic efficiency was related to i) the generation of reactive oxidation species induced by photogenerated electrons, ii) the reduced recombination rate for electron-hole pairs, and iii) large specific surface area. |
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| Keywords: | Composite Photocatalytic activity Solar light |
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