Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 46, Issue 4, Pages 2205-2214Publisher
SPRINGER
DOI: 10.1007/s11164-020-04087-x
Keywords
Defective TiO2; Sol-gel hydrothermal; Oxygen vacancies; Photocatalysis
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Funding
- National Natural Science Foundation of China [21703288]
- Fundamental Research Funds for the Central Universities [2632019PY02]
- Young Teacher Research Funds from College of Science, China Pharmaceutical University [2018CSYT009]
- Youth Project of Science and Technology Research Program of Chongqing Education Commission of China [KJQN201801226]
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Defective TiO2 nanocrystals (D-TiO2) were synthesized by a simple, mild and green sol-gel hydrothermal method. The as-prepared sample possesses a high specific surface area of 173.6 m(2)/g and high crystallinity of anatase phase without any calcination. Raman, EPR and XPS spectrum confirmed the existence of oxygen vacancies in D-TiO2. These oxygen vacancies provide D-TiO2 with visible-light photocatalytic activity, as demonstrated by the degradation of Rhodamine B (RhB). The degradation pathway of RhB over D-TiO2 was investigated, and the possible photocatalytic mechanism was also proposed. The excellent photocatalytic property of D-TiO2 was mainly attributed to the synergistic effect between the high surface area and abundant oxygen vacancies. This work presents a new route to synthesize high-performance visible-light-responsive TiO2 photocatalyst.
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