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Exfoliated graphite with y-Fe2O3 for the removal of oil and organic pollutants from the water surface: Synthesis, Mossbauer study, sorption and magnetic propertiesстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Иванов Андрей Владимирович, Volkova Svetlana I., Maksimova Natalia V., Pokholok Konstantin V., Kravtsov Alexei V., Belik Alexei A., Posokhova Svetlana M., Kalachev Igor L., Avdeev Victor V.
- Журнал: Journal of Alloys and Compounds
- Том: 960
- Год издания: 2023
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 170619
- DOI: 10.1016/j.jallcom.2023.170619
- Аннотация: Exfoliated graphite (EG) is a promising sorbent for oil and organic pollutants, which has a high sorption capacity and hydrophobicity. Modifying the EG with ferrimagnetic compound allows EG with sorbed oil to be collected from the water surface with the use of a magnetic field. The aim of this work is to obtain a sorbent based on exfoliated graphite with ferrimagnetic maghemite (γ-Fe2O3) and investigate its structure and functional properties. The preparation of iron-containing EG includes the impregnation of expandable graphite with a FeCl3 water solution and the thermal treatment of impregnated expandable graphite at temperatures between 400-1000 oC. Mossbauer spectroscopy, X-ray diffraction analysis, scanning electron microscopy and energy dispersive X-ray spectroscopy show the evolution of the iron-containing phase from FeOCl to the mixture of α-Fe2O3 and γ-Fe2O3, which grants magnetic properties to the samples. EG obtained at 1000 oC has a saturation magnetization of 22.7 emu g-1. High macropore and meso-/micropore volume investigated by mercury porosimetry and nitrogen adsorption-desorption method results in a high sorption rate and sorption capacity of EG up to 30 g g-1 toward oil and liquid hydrocarbons. At the same time, the EG sorption capacity toward water is ten times lower.
- Добавил в систему: Иванов Андрей Владимирович
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