Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 908, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.164586
Keywords
2; 4-dinitrophenylhydrazine; N-TiO2-X; g-C3N4; Photocatalysis; S-Scheme
Categories
Funding
- National Natural Science Foundation of China [21673178, 22105160]
- China Postdoctoral Science Foundation [2021M692966]
- Shaanxi Key Laboratory of Special Fuel Chemistry and Material [SPCFSKL20210010]
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A new N-TiO2-X/g-C3N4 (NTCN) composite with improved photocatalytic activity was successfully designed and constructed by co-doping N and Ti3+/Ov to reduce the band gap of TiO2. The composite showed significantly higher photocatalytic degradation rate of 2,4-dinitrophenylhydrazine (2,4-DNPH) under visible light irradiation compared to monomers and other composites.
For improving the photocatalytic activity, a new N-TiO2-X/g-C3N4 (NTCN) composite was designed and constructed successfully by a facile hydrothermal-calcination method. The co-doping N and Ti3+/Ov were achieved to reduce the band gap of TiO2, and g-C3N4 nanosheets were coated firmly on the surface of NTiO2-X to form efficient heterojunctions. The photocatalytic activity of N-TiO2-X/g-C3N4 was evaluated fully under visible light irradiation to achieve the degradation of 2,4-dinitrophenylhydrazine (2,4-DNPH). When the content of g-C3N4 in composite is 30 wt% (NTCN0.3) with calcination temperature of 350 degrees C, the pho-tocatalytic degradation rate of 2,4-DNPH can reach 93.19% after 70 min irradiation, which is much higher than those of monomers and other composites. Furthermore, the degradation process was verified to be pseudo-first-order kinetic model, and the apparent activation energy is 17.23 +/- 2.47 kJ mol(-1). S-scheme heterojunction mechanism was speculated to explain the extremely high photocatalytic degradation ability of NTCN0.3 composite. (C) 2022 Elsevier B.V. All rights reserved.
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