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Adsorption of quinoline from liquid hydrocarbons on graphite oxide and activated carbons

机译：液态烃中的喹啉在氧化石墨和活性炭上的吸附

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摘要

Four carbon-based adsorbents (activated carbon, oxidatively modified activated carbon, graphite, and graphite oxide) were investigated as adsorbents for selectively removing quinoline from a model hydrocarbon fuel. The surface chemical properties of these carbon-based adsorbents were characterized by temperature-programmed desorption coupled with mass spectrometry (TPD-MS), X-ray photoelectron spectroscopy (XRD), elementary analysis (EA) and nitrogen adsorption-desorption analysis in detail. The influences of the textural structures and the surface functional groups of these carbon adsorbents on their adsorption performance were examined. The activated carbon modified by ammonium persulfate oxidation (APS) can achieve an adsorption capacity as high as 35.7 mg-N g(-1). The results indicated that the oxygen-containing functional groups on the surface play a crucial role in determining their adsorptive performance for quinoline. In addition, enhancement of the interlayer distance in the graphite oxide results in a dramatic increase in the adsorption capacity of the graphite oxide. The accessibility of the oxygen functional groups on the surface for quinoline is important to the adsorption behavior. Considering its high adsorption capacity and good regenerability, the graphite oxide may also be a promising adsorbent for selectively adsorptive removal of nitrogen compounds from liquid hydrocarbon streams.
机译：研究了四种基于碳的吸附剂（活性炭，氧化改性的活性炭，石墨和氧化石墨）作为从模型烃类燃料中选择性去除喹啉的吸附剂。这些碳基吸附剂的表面化学特性通过程序升温脱附与质谱（TPD-MS），X射线光电子能谱（XRD），元素分析（EA）和氮吸附-解吸分析进行了详细描述。考察了这些碳吸附剂的结构和表面官能团对其吸附性能的影响。通过过硫酸铵氧化（APS）改性的活性炭可以实现高达35.7 mg-N g（-1）的吸附容量。结果表明，表面上的含氧官能团在决定其对喹啉的吸附性能中起着至关重要的作用。另外，增大氧化石墨中的层间距离导致氧化石墨的吸附容量急剧增加。喹啉表面氧官能团的可及性对吸附行为很重要。考虑到其高吸附能力和良好的可再生性，氧化石墨也可能是从液态烃物流中选择性吸附去除氮化合物的有前途的吸附剂。

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