Journal
MOLECULES
Volume 26, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/molecules26196031
Keywords
TiO2/CdS nanocomposites; highly reactive facets; synergistic effects; photocatalytic activity
Funding
- Applied Basic Research Project of Shanxi [201901D111303, 201801D121257]
- Shanxi Scientific and Technological Innovation Programs of Higher Education Institutions [2019L0881, 2020L0579]
- Shanxi 1331 Project Key Innovation Team [PY201817]
- Shanxi 1331 project Collaborative Innovation Center Fund project [I018038]
- Jinzhong University 1331 Project Key Innovation Team [jzxycxtd2019005]
- Doctor Research Funds of Jinzhong University
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In this study, TiO2/CdS nanocomposites with different exposed facets were synthesized and characterized. Among them, FMA-TiO2/CdS exhibited the highest photocatalytic activity with a degradation efficiency of 88.4%, attributed to its largest surface energy, co-exposed {101}/{010} facets, lowest photoluminescence intensity, lower charge-transfer resistance, and higher charge-transfer efficiency.
In this work, TiO2/CdS nanocomposites with co-exposed {101}/[111]-facets (NH4F-TiO2/CdS), {101}/{010} facets (FMA-TiO2/CdS), and {101}/{010}/[111]-facets (HF-TiO2/CdS and Urea-TiO2/CdS) were successfully synthesized through a one-pot solvothermal method by using [Ti4O9](2-) colloidal solution containing CdS crystals as the precursor. The crystal structure, morphology, specific surface area, pore size distribution, separation, and recombination of photogenerated electrons/holes of the TiO2/CdS nanocomposites were characterized. The photocatalytic activity and cycling performance of the TiO2/CdS nanocomposites were also investigated. The results showed that as-prepared FMA-TiO2/CdS with co-exposed {101}/{010} facets exhibited the highest photocatalytic activity in the process of photocatalytic degradation of methyl orange (MO), and its degradation efficiency was 88.4%. The rate constants of FMA-TiO2/CdS was 0.0167 min(-1), which was 55.7, 4.0, 3.7, 3.5, 3.3, and 1.9 times of No catalyst, CdS, HF-TiO2/CdS, NH4F-TiO2/CdS, CM-TiO2, Urea-TiO2/CdS, respectively. The highest photocatalytic activity of FMA-TiO2/CdS could be attributed to the synergistic effects of the largest surface energy, co-exposed {101}/{010} facets, the lowest photoluminescence intensity, lower charge-transfer resistance, and a higher charge-transfer efficiency.
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