Abstract
A simple hydrothermal treatment of chitin in dilute nitric acid (0.5–2.0 wt %) at 180°C for up to 3 h, which provides the dissolution of up to 50% of the polysaccharide and the formation of nanosized carbon quantum dots (C-dots), is proposed. Aqueous solutions of C-dot dispersions have high dispersion stability. Under illumination with a luminescent lamp, the solutions exhibit bright luminescence, the characteristic feature of which is a change in color with variation in the excitation wavelength. According to high-resolution transmission electron microscopy, the C-dots have a crystalline structure. It is specified that the proposed mechanisms of the hydrothermal carbonization of carbohydrates assume the formation of only an amorphous coal-like product. The example of the hydrothermal treatment of a sucrose solution shows that, along with the formation of a solid precipitate of spherical carbon microparticles that is described in the literature, the formation of a luminescent crystalline product occurs. This fact suggests that the carbonization mechanism is more complicated than what has been assumed.
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Original Russian Text © Yu.A. Shchipunov, O.N. Khlebnikov, V.E. Silant’ev, 2015, published in Russian in Vysokomolekulyarnye Soedineniya, Ser. B, 2015, Vol. 57, No. 1, pp. 18–25.
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Shchipunov, Y.A., Khlebnikov, O.N. & Silant’ev, V.E. Carbon quantum dots hydrothermally synthesized from chitin. Polym. Sci. Ser. B 57, 16–22 (2015). https://doi.org/10.1134/S1560090415010121
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DOI: https://doi.org/10.1134/S1560090415010121