Preparation of nodular carbon cryogel from simple and inexpensive polycondensation reaction of commercial modified black wattle tannin |
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Authors: | Liana Alvares Rodrigues Julien Parmentier José Bernardo Parra Gilmar Patrocínio Thim |
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Institution: | 1. Instituto Tecnológico de Aeronáutica-ITA/CTA, Pra?a Mal. Eduardo Gomes 50, S?o José dos Campos, S?o Paulo, CEP 12228-900, Brazil 2. Institut de Science des Matériaux de Mulhouse, LRC CNRS 7228, 15 rue Jean Starcky, 68057, Mulhouse, France 3. Energy and Environment Department, Instituto Nacional del Carbón, CSIC, P.O. 73, 33080, Oviedo, Spain
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Abstract: | Tannin–formaldehyde cryogels (TFC) were synthesized by sol–gel polycondensation of low molecular weight and highly reactive modified tannin with formaldehyde using HCl as a catalyst. Carbon cryogels (CC) were obtained by the TFC pyrolysis at an inert atmosphere at 800 °C. Pyrolysis caused significant changes in the physical and chemical properties of the material. The pyrolysis induced the decomposition of acid superficial groups and the development of basic ones. Pyrolysis also provoked significant change in the pore volume, forming a great amount of micropores. TFC and CC showed amorphous and turbostratic structures, respectively. Unpurified samples had inorganic impurities in their compositions. |
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