期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 30, 页码 14063-14076出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2022.02.1530360-3199
关键词
Cadmium sulfide; Nickel sulfide; Graphitic carbon nitride; Photocatalytic performance; Carrier transfer; Photocatalytic mechanism
资金
- National Natural Science Foundation of China [51802245]
- Shaanxi ProvinceInnovative Talent Promotion Plan-Young Science and Tech-nology Star [2021KJXX-43]
- Jiaxing Public Welfare Projects [2020AD10021]
- Science and Technology Guidance Project Plan of China National Textile and Apparel Council [2020004]
- Natural Science Basic Research Plan in the Shaanxi Province of China [2020JQ-828]
- China Post-doctoral Science Foundation [2018M631188]
- Shaanxi Provincial Association of Science and Technology Youth Talents Lifting Plan [20180418]
- Shaanxi Provincial Education Department [18JK0350]
- Scientific Research Foundation for Ph.D., Xi'a Polytechnic University [BS1741]
- Graduate Inno-vation Foundation of Xi'an Polytechnic University [chx2021031]
In this study, composites based on two-dimensional graphitic carbon nitride nanosheets were prepared using a facile chemical deposition method, with CdS/NiS/g-C3N4 showing superior photocatalytic performance and significantly enhanced hydrogen production efficiency. The stability of the composite was also demonstrated to be high over multiple cycles.
The two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanosheets based composites are prepared in the form of the NiS/g-C3N4, CdS/g-C3N4 and CdS/NiS/g-C3N4 using a facile and reliable method of chemical deposition. The TEM and HRTEM images demonstrated a spectacular representation of the 2D lamellar microstructure of the g-C3N4 with adequately attached CdS and NiS nanoparticles. The changes in crystallinity and the surface elemental valence states of composites with the incorporation of two metal sulphides are studied, which confirmed the formation of composites. The photocatalytic response of the composites was estimated by photodegradation of Rhodamine B (C28H31ClN2O3-RhB), and the ternary composite CdS/NiS/g-C3N4 samples exhibited the superior photocatalytic performance. Further, the free radical capture and electron paramagnetic resonance (EPR) spectroscopy experiments identified the main active species that contributed to the photocatalytic reaction. Besides, the samples' photocatalytic performance was evaluated by photocatalytic hydrogen production. The stability of the performance-optimized composite was determined by employing cyclic experiments over five cycles. The CdS/NiS/g-C3N4 showed the highest efficiency of hydrogen production i.e. about 423.37 mmol.g-1.h-1, which is 2.89 times that of the pristine g-C3N4. Finally, two types of heterojunction structures (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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