Abstract
Chromium hydroxide (CH) was prepared by the reduction of purified sodium chromate using starch. CH was then used to prepare chromium oxide (Cr2O3). 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 Cr2O3. Cr(VI) in CH induced the evolution of CH and the formation of Cr(VI) containing compounds including CrO3, NaCr(CrO4)2, Cr3O8, and Cr5O12 at low sintering temperature. Furthermore, homogeneous Cr2O3 nanoparticles with 99 % purity and particle size of 50 nm were obtained.
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Acknowledgements
This work was financially supported by the National Science Foundation for Distinguished Young Scholars of China (51125018), the National Key Technologies R&D Program (2011BAC06B07), the National Natural Science Foundation of China (51204153), the National High-tech R&D Program of China (863 Program) (2011AA060704), and Henan Yongtong Nickel Industry Company Limited. The authors wish to thank them for continuous support over the course of the project.
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Wei, G., Qu, J., Qi, T. et al. Formation of Cr(VI) compounds during the thermal decomposition of amorphous chromium hydroxide. J Therm Anal Calorim 117, 741–745 (2014). https://doi.org/10.1007/s10973-014-3785-4
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DOI: https://doi.org/10.1007/s10973-014-3785-4