Tailoring the bandgap of N-rich graphitic carbon nitride for enhanced photocatalytic activity |
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| Affiliation: | 1. School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, South Korea;2. Department of Chemical Engineering, Yeungnam University, Gyeongsan 38541, South Korea;1. School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, People’s Republic of China;2. Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada;3. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People’s Republic of China;1. Department of Chemical Engineering and CRC for Contamination Assessment and Remediation of the Environment (CRC CARE), Curtin University, GPO Box U1987, WA 6845, Australia;2. School of Chemical Engineering, Shandong University of Technology, Zibo 255049, PR China;1. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan;2. Department of Industrial Engineering, Universitas Prima Indonesia, Medan, Indonesia;3. Graduate Institute of Energy and Sustainability Technology, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei 10607, Taiwan;1. School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, PR China;2. School of The Environment, Jiangsu University, Zhenjiang 212013, PR China |
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| Abstract: | ![]()
Nitrogen - rich graphitic carbon nitride (Ng-C3N4) with improved photocatalytic activity was engineered using a facile post-annealing treatment of pristine g-C3N4 in N2 atmosphere. The thermal annealing did not modify the crystal structure, vibrational modes, or morphology of the N-rich g-C3N4 (Ng-C3N4). However, it decreased the crystallinity by broadening the dominant X-ray diffraction (XRD) peak and increased the surface area and mesoporous nature because of the formation of carbon vacancies. Diffuse reflectance spectroscopy indicated that the bandgap of the annealed Ng-C3N4 decreased from 2.82 to 2.77 eV compared to pristine g-C3N4. The increase of nitrogen content in the annealed Ng-C3N4 was quantified by X-ray photoelectron spectroscopy (XPS), which was also used to examine the formation of carbon vacancies. Photocurrent and electrochemical impedance spectroscopy measurements showed that the annealed Ng-C3N4 had higher light absorption capacity than the pristine g-C3N4. The photocatalytic performance of the samples was investigated for the degradation of crystal violet (CV) under ultra-violet light irradiation. The annealed Ng-C3N4 sample exhibited superior photodegradation of CV over pristine g-C3N4. |
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| Keywords: | Graphitic carbon nitride Thermal annealing Carbon vacancies Bandgap narrowing Enhanced photodegradation |
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