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首页> 外文期刊>The journal of physics and chemistry of solids >Two-stage preparation of magnetic sorbent based on exfoliated graphite with ferrite phases for sorption of oil and liquid hydrocarbons from the water surface
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Two-stage preparation of magnetic sorbent based on exfoliated graphite with ferrite phases for sorption of oil and liquid hydrocarbons from the water surface

机译：基于剥离石墨的铁素体阶段的磁吸附剂两阶段制备，用于从水面吸附油和液态烃的吸附

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摘要

Due to the macropore structure and the hydrophobic properties, exfoliated graphite (EG) is considered as a perspective sorbent for oil and liquid hydrocarbons from the water surface. However, there is the problem of EG collection from the water surface. One of the solutions is the modification of EG by a magnetic compound and the collection of EG with sorbed oil using the magnetic field. In this work, the method of the two-stage preparation of exfoliated graphite with ferrite phases is proposed. This method includes the impregnation of expandable graphite in the mixed solution of iron (III) chloride and cobalt (II) or nickel (II) nitrate in the first stage and the thermal exfoliation of impregnated expandable graphite with the formation of exfoliated graphite containing cobalt and nickel ferrites in the second stage. Such two-stage method makes it possible to obtain the sorbent based on EG modified by ferrimagnetic phases with high sorption capacity toward oil (up to 45-51 g/g) and high saturation magnetization (up to 42 emu/g). On the other hand, this method allows to produce the magnetic sorbent in a short period of time (up to 10 s) during which the thermal exfoliation is carried out in the air atmosphere.
机译：由于大孔结构和疏水性质，剥落的石墨（例如）被认为是来自水面的油和液体烃的透视吸附剂。然而，存在例如从水面收集的问题。其中一个解决方案是例如通过磁性化合物和例如使用磁场的吸附油的修改。在这项工作中，提出了具有铁氧体相的剥离石墨的两级制备的方法。该方法包括浸渍铁（III）氯化铁（III）氯化铁（II）和钴（II）的混合溶液中的可膨胀石墨，并在第一阶段中的硝酸镍和浸渍的可膨胀石墨的热剥离，形成含有钴的剥离石墨和第二阶段的镍铁氧体。这种两级方法使得可以基于例如通过具有高吸附能力的铁磁脉（高达45-51g / g）和高饱和磁化强度（高达42 emu / g）改性的吸附剂。另一方面，该方法允许在短时间（最多10秒）的短时间内产生磁性吸附剂，在此期间热剥离在空气气氛中进行。

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