期刊
MOLECULES
卷 24, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/molecules24162996
关键词
anatase; rutile nanocomposites; {101} facets; {110} facets; photocatalytic activity
资金
- higher education reform and innovation project of Shanxi [J2019186]
- education reform and innovation project of Jinzhong University [J201903]
- fund for Shanxi 1331 Project Key Innovation Team [PY201817]
- fund for Jinzhong University 1331 Project Key Innovation Team [jzxycxtd2017004]
- applied basic research project of Shanxi [201801D221060]
- National Science Foundation of China [51272030, 51572031]
- Japan Society for the Promotion of Science [26289240]
- Kagawa University [26289240]
Anatase/rutile mixed-phase TiO2 nanoparticles were synthesized through a simple sol-gel route with further calcination using inexpensive titanium tetrachloride as a titanium source, which effectively reduces the production cost. The structural and optical properties of the prepared materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV-vis adsorption. The specific surface area was also analyzed by Brunauer-Emmett-Teller (BET) method. The anatase/rutile mixed-phase TiO2 nanocomposites containing of rod-like, cuboid, and some irregularly shaped anatase nanoparticles (exposed {101} facets) with sizes ranging from tens to more than 100 nanometers, and rod-like rutile nanoparticles (exposed {110} facets) with sizes ranging from tens to more than 100 nanometers. The photocatalytic activities of the obtained anatase/rutile mixed-phase TiO2 nanoparticles were investigated and compared by evaluating the degradation of hazardous dye methylene blue (MB) under ultraviolet light illumination. Compared to the commercial Degussa P25-TiO2, the mixed-phase TiO2 nanocomposites show better photocatalytic activity, which can be attributed to the optimal anatase to rutile ratio and the specific exposed crystal surface on the surface. The anatase/rutile TiO2 nanocomposites obtained at pH 1.0 (pH1.0-TiO2) show the best photocatalytic activity, which can be attributed to the optimal heterojunction structure, the smaller average particle size, and the presence of a specific exposed crystal surface. The enhanced photocatalytic activity makes the prepared anatase/rutile TiO2 photocatalysts a potential candidate in the removal of the organic dyes from colored wastewater.
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