Abstract
A method of lactic-acid (LA) polycondensation on a carbon sorbent, including sorbent impregnation and multistep thermal treatment with no catalysts or toxic solvents, is developed. This modification technique makes it possible to obtain materials with adjustable properties (molecular weight of the synthesized oligomer, amount of applied modifier, degree of screening of carbon-sorbent pores, etc.). The resulting sorbent samples were investigated using various physicochemical methods: 13С and 1Н NMR spectroscopy, low-temperature nitrogen adsorption, differential thermal analysis, etc. It is established that the modifier concentration has an impact on the physicochemical characteristics of the studied carbon-sorbent samples. Of greatest interest is the carbon-sorbent sample impregnated with a 50% lactic-acid solution with subsequent thermal treatment. Its composition includes a high content of the modifier (biologically active substance with biospecific properties) and exhibits durable action.
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Original Russian Text © L.G. P’yanova, V.A. Likholobov, V.A. Drozdov, O.N. Baklanova, V.P. Talzi, A.V. Sedanova, M.S. Drozdetskaya, N.V. Kornienko, 2017, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2017, Vol. 53, No. 4, pp. 368–374.
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P’yanova, L.G., Likholobov, V.A., Drozdov, V.A. et al. Synthesis and physicochemical properties of a biospecific carbon sorbent modified with lactic-acid oligomers. Prot Met Phys Chem Surf 53, 639–644 (2017). https://doi.org/10.1134/S2070205117040189
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DOI: https://doi.org/10.1134/S2070205117040189