期刊
SURFACE AND INTERFACE ANALYSIS
卷 51, 期 10, 页码 968-981出版社
WILEY
DOI: 10.1002/sia.6679
关键词
CdTe quantum dots; microstructural defects; photocatalytic mechanism; sized dependence; TiO2
资金
- National Natural Science Foundation of China [11405050, 21302150]
- Nuclear Technology Key Subject Project of Hubei University of Science and Technology [2019-20KZ01]
- Innovative Training Program for College Students in Hubei Province [S201910927021]
- Science Development Foundation of Hubei University of Science and Technology [2018-19KZ05]
- Key Projects of the Education Department of Hubei Province [D20182803]
- Project of the Science and Technology Department of Hubei Province [2018AFB150]
A series of sensitized TiO2 NPs with enhanced photocatalytic activity were prepared by different sized CdTe QDs with bifunctional ligand interlinking. The microstructures and morphologies of four different sizes of CdTe QDs and CdTe QDs sensitized TiO2 NPs were characterized systematically by fluorescence spectroscopy, UV-Vis diffuse reflectance spectroscopy, FT-IR, XRD, XPS, FE-SEM, HRTEM, BET, and positron annihilation lifetime spectroscopy (PALS). The photocatalytic performance of CdTe QDs sensitized TiO2 NPs was investigated by degrading MO and MB in aqueous solution under visible light irradiation. The process of degradation complied with the first-order reaction kinetics. Four different sized CdTe QDs sensitized TiO2 exhibited higher photocatalytic activities than TiO2. Particularly, yellow emitting CdTe QDs (3.28 nm) sensitized TiO2 (CT_1.5) showed the best photocatalytic performance, which may be attributed to the optimal NP size, and has a moderate light absorption and electron injection. The effect of microstructural defects on CdTe QDs sensitized TiO2 has been confirmed effectively by positron lifetime measurements.
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