Exfoliated graphite for sorption of liquid hydrocarbons from the water surface: Effect of preparation conditions on sorption capacity and water wettability

IF 3 4区工程技术 Q3 CHEMISTRY, PHYSICAL Adsorption Pub Date : 2024-04-14 DOI:10.1007/s10450-024-00475-6

Andrei V. Ivanov, Daria A. Divitskaya, Maksim A. Lavrin, Alexei V. Kravtsov, Svetlana I. Volkova, Natalia V. Maksimova, Igor L. Kalachev, Alexey N. Kirichenko, Nikolai B. Rodionov, Artem P. Malakho, Victor V. Avdeev

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Abstract

Exfoliated graphite (EG) is a promising macroporous sorbent for oils and liquid hydrocarbons on water surfaces. The preparation of EG includes a synthesis of graphite intercalation compounds, expandable graphite and its thermal exfoliation. The structure of the initial graphite intercalation compound (GIC) has a significant influence on the structure of exfoliated graphite and its sorption properties: sorption capacity and selectivity of water/octane sorption. Thus, the aim of this work was to investigate the relationship between the structure of EG based on 1st stage, 2nd stage, 3rd stage, 4th stage GICs and EG sorption properties and water wettability. The influence of the GIC stage number on the EG sorption and surface properties is studied. EG obtained from 1st stage GIC at 1000 °C is characterized by a higher sorption capacity toward octane than EG from 4th stage GIC. The selectivity of octane/water sorption reduces when decreasing the GIC stage number from 4 to 1. The high sorption of water can be explained by a higher surface area of EG and the presence of remaining oxygen groups on the edges of graphite crystallites in the EG structure. The EG structure was investigated by XRD, SEM, nitrogen adsorption–desorption method, FTIR and Raman spectroscopy.

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用于吸附水面液态碳氢化合物的剥离石墨：制备条件对吸附能力和水润湿性的影响

剥离石墨（EG）是一种很有前途的大孔吸附剂，可吸附水面上的油类和液态碳氢化合物。EG 的制备包括石墨插层化合物的合成、可膨胀石墨及其热剥离。初始石墨插层化合物（GIC）的结构对剥离石墨的结构及其吸附特性（吸附能力和水/辛烷吸附的选择性）有重大影响。因此，这项工作旨在研究基于第一级、第二级、第三级和第四级 GIC 的 EG 结构与 EG 吸附性能和水润湿性之间的关系。研究了 GIC 级数对 EG 吸附和表面特性的影响。与第四级 GIC 的 EG 相比，在 1000 °C 下从第一级 GIC 中获得的 EG 对辛烷的吸附能力更高。辛烷/水的吸附选择性随着 GIC 级数从 4 级降到 1 级而降低。水的高吸附性可以用 EG 较高的表面积和 EG 结构中石墨结晶边缘残留的氧基团来解释。通过 XRD、SEM、氮吸附-解吸法、傅里叶变换红外光谱和拉曼光谱对 EG 结构进行了研究。

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.