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In-situ synthesis and enhanced photocatalytic nitrogen fixation property of novel NiS/g-C3N4 heterostructure photocatalysts with nitrogen vacancy.
- Source :
-
Diamond & Related Materials . Dec2023:Part B, Vol. 140, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Rapid recombination of the photo-generated charge carriers leads to the poor photocatalytic nitrogen fixation property of pristine graphite-like carbon nitride (g-C 3 N 4). To enhance the photocatalytic performance of g-C 3 N 4 , nickel sulfide (NiS) nanoparticles were anchored onto the surface of g-C 3 N 4 by using the in-situ decomposition-thermal polymerization method in this work. The incorporation of NiS cocatalyst expanded the absorption range, enhanced the efficiency of separating photo-generated charge carriers, reduced the band gap from 2.78 eV to 2.47 eV, increased the specific surface area 7.1 m2·g−1 to 19.5 m2·g−1, and enlarged the photo-current density, which can inhibit the recombination of photo-generated charge carriers. Furthermore, the emergence of the nitrogen vacancy occurred during the in-situ synthetic process as a result of the thermal decomposition of thioacetamide hydrolysate, thereby leading to an enhancement in the photocatalytic nitrogen fixation efficiency. The results of the nitrogen fixation experiment demonstrated that 13 % NiS/g-C 3 N 4 exhibited the highest activity, with a photocatalytic nitrogen fixation rate of 8.15 mg/L. This rate is 7.6 times greater than that of pure g-C 3 N 4 , which can be attributed to several factors, including a higher separation rate of photogenerated electrons, a larger specific surface area, a wider range of responsiveness to visible light, and the presence of the nitrogen vacancy. [Display omitted] • NiS modified g-C 3 N 4 is prepared by an in-situ decomposition-thermal polymerization. • NiS/CN shows nitrogen vacancy, wide absorption range and efficient charge transfer. • NiS/CN exhibits enhanced photocatalytic nitrogen fixation performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09259635
- Volume :
- 140
- Database :
- Academic Search Index
- Journal :
- Diamond & Related Materials
- Publication Type :
- Academic Journal
- Accession number :
- 173748940
- Full Text :
- https://doi.org/10.1016/j.diamond.2023.110533