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. 2022 Jun 28;7(27):23503–23510. doi: 10.1021/acsomega.2c01963

Figure 2.

Figure 2

Photographs and the UV–vis spectra of Mn2O7–H2SO4–GIC. (a) Photographs of a liquid composed of concentrated KMnO4 + H2SO4 + NaNO3 + GT and stirred at 0–4 °C for 30 min. (b) Optical microphotographs (500×) of a graphite flake in concentrated sulfuric acid. (c) Photographs of liquid composed of concentrated KMnO4 + H2SO4 + NaNO3 + GT and stored at 8 °C for 12 days. (d) Optical microphotographs (500×) of Mn2O7–H2SO4–GIC diluted with concentrated sulfuric acid and stored at 8 °C for 12 days. (e) UV–vis spectra of KMnO4 + H2SO4 + NaNO3 + GT diluted with concentrated sulfuric acid and stirred at 0–4 °C for 30 min.