期刊
NANOTECHNOLOGY REVIEWS
卷 9, 期 1, 页码 410-417出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/ntrev-2020-0030
关键词
supercritical water; nanoparticles; titanium dioxide
类别
资金
- National Key Research and Development Program of China [2016YFC0801904]
- Fundamental Research Funds for the Central Universities [xjj2018006, xjj2018201]
- National Natural Science Foundation of China [51871179]
Supercritical hydrothermal synthesis of nanosized metal oxides is of great interest for scholars due to its one-pot and readily realizing commercial production process. Hydrothermal synthesis of nanosized TiO2 in subcritical and supercritical water was investigated with different reaction temperatures (250-450 degrees C), time (3-10 min), precursor species (Ti(SO4)(2), TiCl4), and the addition of a surfactant (CH3(CH2)(5)NH2). TiO2 synthesized under supercritical state has a higher degree of crystallinity when compared with TiO2 obtained from subcritical state, which is attributed to a higher reaction rate. Extending reaction time from 3 to 10 min leads to the growth of crystal and broader size distribution (36.66 +/- 8.5 nm). More uniform products can be obtained when Ti(SO4)(2) acting as the precursor compared with TiCl4 being the precursor. The application of surfactant CH3(CH2)(5)NH2 in the synthesis makes chemical bonding between the particle surface and organic ligand. It affects the growth direction of TiO2 crystal; as a result, rod-like TiO2 crystal is obtained.
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