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- Title
Formation of Cr(VI) compounds during the thermal decomposition of amorphous chromium hydroxide.
- Authors
Wei, Guangye; Qu, Jingkui; Qi, Tao; Zheng, Yudong; Guo, Qiang
- Abstract
Chromium hydroxide (CH) was prepared by the reduction of purified sodium chromate using starch. CH was then used to prepare chromium oxide (CrO). Results of thermogravimetric, X-ray diffraction, Fourier transform infrared spectroscopy, and chemical analyses suggested that a small amount of the initial Cr(VI) content speeds up the oxidation and reduction reactions, thereby promoting the purity and crystallization of CrO. Cr(VI) in CH induced the evolution of CH and the formation of Cr(VI) containing compounds including CrO, NaCr(CrO), CrO, and CrO at low sintering temperature. Furthermore, homogeneous CrO nanoparticles with 99 % purity and particle size of 50 nm were obtained.
- Subjects
CHROMIUM ions; METAL formability; CHEMICAL decomposition; CHROMIUM hydroxide; AMORPHOUS substances; THERMAL properties of metals
- Publication
Journal of Thermal Analysis & Calorimetry, 2014, Vol 117, Issue 2, p741
- ISSN
1388-6150
- Publication type
Letter
- DOI
10.1007/s10973-014-3785-4