期刊
MICROMACHINES
卷 13, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/mi13111812
关键词
crystal facets; molybdenum sulfide; titanium dioxide; TiO2; MoS2 composites; photocatalytic activity
类别
资金
- Applied Basic Research Project of Shanxi [201901D111303]
- Shanxi Scientific and Technological Innovation Programs of Higher Education Institutions [2019L0881, 2020L0602]
- Jinzhong University 1331 Project Key Innovation Team [jzxycxtd2019005]
- Natural Science Foundation of Inner Mongolia [2018MS02023]
- Jinzhong University
In this study, TiO2/MoS2 composites with exposed high-energy facets were synthesized under different pH conditions, with pH3.5-TiO2/MoS2 showing the highest photocatalytic degradation efficiency and rate, attributed to its large specific surface area, suitable heterojunction structure, and favorable photogenerated charge-separation efficiency. This work provides insights into designing more efficient and stable photocatalysts.
In this work, with the the H2TiO3 colloidal suspension and MoS2 as the precursors, TiO2/MoS2 composites composed of anatase TiO2 nanocrystals with co-exposed {101} and [111]-facets (nanorod and nanocuboid), {101} and {010} facets (nanospindle), and MoS2 microspheres constructed by layer-by-layer self-assembly of nanosheets were hydrothermally synthesized under different pH conditions. The characterization has been performed by combining X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution TEM (HRTEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectra, and UV-visible absorption spectrum analyses. The photocatalytic degradation of rhodamine B (RhB) in an aqueous suspension was employed to evaluate the photocatalytic activity of the as-prepared pHx-TiO2/MoS2 composites. The photocatalytic degradation efficiency of pH3.5-TiO2/MoS2 composite was the highest (99.70%), which was 11.24, 2.98, 1.48, 1.21, 1.09, 1.03, 1.10, and 1.14 times that of Blank, MoS2, CM-TiO2, pH1.5-TiO2/MoS2, pH5.5-TiO2/MoS2, pH7.5-TiO2/MoS2, pH9.5-TiO2/MoS2, pH11.5-TiO2/MoS2, respectively. The pH3.5-TiO2/MoS2 composite exhibited the highest photocatalytic degradation rate, which may be attributed to the synergistic effects of its large specific surface area, suitable heterojunction structure, and favorable photogenerated charge-separation efficiency. This work is expect to provide primary insights into the photocatalytic effect of TiO2/MoS2 composite with co-exposed high-energy facets, and make a contribution to designing more efficient and stable photocatalysts.
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