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Fabrication of a high-efficiency CdS@TiO2@C/Ti3C2 composite photocatalyst for the degradation of TC-HCl under visible light.
- Source :
- New Journal of Chemistry; 2/21/2022, Vol. 46 Issue 7, p3305-3314, 10p
- Publication Year :
- 2022
-
Abstract
- A novel CdS@TiO<subscript>2</subscript>@C/Ti<subscript>3</subscript>C<subscript>2</subscript> composite as a high-efficiency photocatalyst for the degradation of tetracycline hydrochloride (TC-HCl) was fabricated by in situ oxidizing two-dimensional (2D) layered transition metal Ti<subscript>3</subscript>C<subscript>2</subscript> MXene and subsequently compounding with CdS nanoparticles (NPs) via a two-step hydrothermal method. Benefitting from the in situ oxidation of Ti<subscript>3</subscript>C<subscript>2</subscript> MXene, the derived TiO<subscript>2</subscript>@C/Ti<subscript>3</subscript>C<subscript>2</subscript> composites possess excellent interface contact and uniform morphology distribution. Furthermore, the in situ grown TiO<subscript>2</subscript> displays a nanosheet (NS) structure with high-energy (001) facets, which could bring about unique surface heterojunctions between the (101) and (001) facets of the TiO<subscript>2</subscript> NSs. On the above basis, CdS NPs are introduced to effectively improve the light-harvesting ability in the visible region due to the narrow band gap and enlarged surface area. Meanwhile, the separation and transfer efficiencies of photo-generated carriers are significantly enhanced by the synergistic effect of the C/Ti<subscript>3</subscript>C<subscript>2</subscript> matrix, surface heterojunctions of the TiO<subscript>2</subscript> NSs and heterojunctions of CdS/TiO<subscript>2</subscript>. Therefore, the CdS@TiO<subscript>2</subscript>@C/Ti<subscript>3</subscript>C<subscript>2</subscript> composites display remarkably enhanced photocatalytic ability for TC-HCl degradation under the irradiation of visible light, and the CdS@TiO<subscript>2</subscript>@C/Ti<subscript>3</subscript>C<subscript>2</subscript>-2 sample exhibits optimal photodegradation efficiency with a value of 85% within 60 min, which is 8.5 times higher than that of the TiO<subscript>2</subscript>@C/Ti<subscript>3</subscript>C<subscript>2</subscript> sample. Additionally, the corresponding improved mechanism is also deeply discussed in the present paper. [ABSTRACT FROM AUTHOR]
- Subjects :
- VISIBLE spectra
SILVER
BAND gaps
MATRIX effect
TRANSITION metals
HETEROJUNCTIONS
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 46
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 155236104
- Full Text :
- https://doi.org/10.1039/d1nj05786c