| Adsorption of Quinoline from Liquid Hydrocarbons on Graphite Oxide and Activated Carbons RSC Advances 2015，5: 74684-74691 Four carbon-based adsorbents (activated carbon, oxidatively modified activated carbon, graphite, and graphite oxide) were investigated as adsorbents for selective removing quinoline from heptane. 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 surface area and porosimetry analyzer 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 35.7mg-N/g. An excellent adsorbent with the highest adsorption capacity per square meter (3.128 mg-N/m2) was also prepared from the appropriate oxidation of graphite. 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 is another reason for the dramatic increase in the adsorption capacity of the graphite oxide. The accessibility of the oxygen functional groups on the surface for quinoline is also important to the adsorption behavior. Considering its high adsorption capacity per square meter and good regenerability, the graphite oxide may also be a promising adsorbent for selectively adsorptive removing the nitrogen compounds from the liquid hydrocarbon streams. 链接：http://pubs.rsc.org/en/content/articlehtml/2015/ra/c5ra09228k |
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