1. Preparation and characterization of TiO2 nanoparticles by two different precipitation methods.
- Author
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Wang, Zhinuo, Liu, Shimin, Cao, Xin, Wu, Sumei, Liu, Chaoqian, Li, Gang, Jiang, Weiwei, Wang, Hualin, Wang, Nan, and Ding, Wanyu
- Subjects
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CALCINATION (Heat treatment) , *METEOROLOGICAL precipitation , *NANOPARTICLES , *TITANIUM tetrachloride , *ENERGY bands , *CRYSTAL structure , *RUTILE - Abstract
This paper describes the structural and photocatalytic studies of TiO 2 nanoparticles prepared by two different precipitation methods using titanium tetrachloride (TiCl 4) and titanium oxalate [Ti(C 2 O 4) 2 as raw materials for the first time. The samples were characterized by TG-DSC, XRD, TEM, EDS, SAED, UV–Vis, Raman, N 2 adsorption-desorption isotherms, and XPS to investigate the effects of salt type and calcination temperature on the crystal structure, morphology, composition, energy band gap and photocatalytic activity of TiO 2 nanoparticles. Results indicated that when TiCl 4 was used as Ti source, the crystallization temperature of amorphous TiO 2 to anatase TiO 2 was as low as 250 °C, but it increased to ~450 °C when Ti(C 2 O 4) 2 was selected. Besides, TiCl 4 was able to dynamically modify the crystalline structure of TiO 2 nanoparticles from anatase into rutile after calcination at ~450 °C, however this temperature was increased to ~850 °C for Ti(C 2 O 4) 2. The optimal photocatalytic property of methyl orange (MO) degradation in two TiO 2 systems was 99.08% and 38.6% with corresponding calcination temperatures of 450 °C and 550 °C, respectively, which was mainly correlated with the different crystal structure and crystallite size. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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