Effects of Preparation Conditions and Ammonia/Methylamine Treatment on Structure of Graphite Intercalation Compounds with FeCl3, CoCl2, NiCl2 and Derived Metal-Containing Expanded Graphite

Muravev, A.D.; Ivanov, A.V.; Mukhanov, V.A.; Dedushenko, S.K.; Kulnitskiy, B.A.; Vasiliev, A.V.; Maksimova, N.V.; Avdeev, V.V.

Авторы: Muravev Aleksandr D., Ivanov Andrei V., Mukhanov Vladimir A., Dedushenko Sergey K., Kulnitskiy Boris A., Vasiliev Alexander V., Maksimova Natalia V., Avdeev Victor V.
Журнал: Solids
Том: 6
Номер: 4
Год издания: 2025
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 60
Последняя страница: 60
DOI: 10.3390/solids6040060
Аннотация: Composites in which finely dispersed particles of the metallic phase are uniformly distributed over the surface of expanded graphite can be used as magnetic sorbents for crude oil and petroleum products, as well as a basis for creating screens that protect against electromagnetic radiation. The literature describes various approaches to obtaining such materials, but from a technological point of view, the most promising is the method in which the formation of a metal-containing phase on the surface of expanded graphite is directly combined with its expansion. For this purpose, graphite intercalation compounds with chlorides of metals of the iron triad (GIC-MClx) were obtained: GIC-FeCl3 of I-VII stages, GIC-CoCl2 of I/II stage and GIC-NiCl2 of II/III stage, which were treated with liquid NH3 or CH3NH2 in order to obtain an occlusive complex, which, due to the presence of a large amount of bound RNH2, would be capable of effective thermal expansion during heating in an inert atmosphere with the formation of low-density expanded graphite, and the presence of reducing properties in ammonia and methylamine would lead to the reduction of the metal from chloride. The structure of GIC-MClx and GIC-MClx treated by NH3 and CH3NH2 was investigated by XRD analysis and Mossbauer spectroscopy. The composition of the metal-containing phase in expanded graphite/metal composite was determined by XRD analysis and its quantity by the gravimetric method. The distribution of metals particles is investigated by SEM, TEM and EDX methods. Expanded graphite/metal composites are characterized by the high saturation magnetization (up to ≈ 50 emu/g) at a bulk density of 4–6 g/L.
Добавил в систему: Муравьев Александр Дмитриевич

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Effects of Preparation Conditions and Ammonia/Methylamine Treatment on Structure of Graphite Intercalation Compounds with FeCl3, CoCl2, NiCl2 and Derived Metal-Containing Expanded Graphiteстатья

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