Библиографическое описание:Synthesis and Properties of Carbon Gels Based on Larch Bark Tannins and Hydrolysis Lignin : научное издание / N. M. Mikova [et al.]. - Текст : непосредственный // Russian Journal of Applied Chemistry. - 2022. - Т.95, №3. - P. 393-400. - ISSN 1070-4272. - ISSN 1608-3296, DOI 10.1134/S1070427222030089.
Аннотация:Porous carbon tannin–lignin/formaldehyde and tannin–lignin/furfuryl gels were prepared by carbonization of organic gels synthesized by sol–gel condensation of larch bark tannins and hydrolysis lignin with formaldehyde and furfuryl alcohol. The effect of lignin addition on the porous structure formation, apparent density, and adsorption and electrochemical properties of carbon gels was determined. Analysis by the Brunauer–Emmett–Teller method shows that the carbon gels are microporous materials with high specific surface area. Introduction of lignin into the initial organic tannin–formaldehyde gel favors an increase in the specific surface area of the carbon gel from 237 to 407 m2 g–1, to a decrease in the apparent density from 0.61 to 0.37 g cm–3, and to a decrease in the fraction of micropores in the total pore volume from 88 to 85.6%. The specific surface area of carbon tannin–lignin/furfuryl gels is somewhat higher than that of tannin–lignin/formaldehyde gels and reaches 512 m2 g–1 in a sample with 20% lignin content. The density of tannin–lignin/furfuryl gels increases from 0.17 to 0.32 g cm–3 with an increase in their lignin content from 10 to 30 wt %. Examination by scanning electron microscopy shows that the structure of carbon gels is a three-dimensional network of interconnected sphere-like particles of size varying from 20 to 100 nm. The tannin–formaldehyde and tannin–furfuryl gels with 10% lignin content are capable to adsorb 35.6 and 55.2 mg g–1 Methylene Blue, respectively. The tannin–lignin/furfuryl gel containing 10 wt % lignin shows the highest performance in benzene sorption (513 mg g–1). Electrochemical trials show that the tannin–lignin/formaldehyde gel with 30% lignin content exhibits the highest ability to accumulate the electric charge.
Издательство:Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд), Санкт-Петербург
Источник:Russian Journal of Applied Chemistry
Выпуск:Т.95, №3
Номера страниц:393-400
Держатель оригинала документа:Institute of Chemistry and Chemical Technology, Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Siberian Federal University
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