Selective Dibenzothiophene Adsorption on Graphene Prepared Using Different Methods

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• 作者：Hoon Sub Song ; Chang Hyun Ko ; Wook Ahn ; Bae Jung Kim ; Eric Croiset ; Zhongwei Chen ; Sung Chan Nam
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：August 1, 2012
• 年：2012
• 卷：51
• 期：30
• 页码：10259-10264
• 全文大小：299K
• 年卷期：v.51,no.30(August 1, 2012)
• ISSN：1520-5045

文摘

Graphite oxide synthesized with phosphoric acid, labeled 鈥淕OP鈥? shows a higher degree of oxidation and has a larger interlayer spacing than the oxide prepared using the conventional Hummers method, referred to as 鈥淕OH鈥? as confirmed by X-ray photoelectron spectroscopy and X-ray diffraction analyses. This study was performed under the assumption that the oxygen-containing functional groups between the GOP layers are more easily reduced than those between the GOH layers. Raman analysis supported this assumption in that the reduced graphene from GOP has a larger number of sp² carbons and fewer defects than the graphene obtained from GOH. The relative extent of defects in graphene can be investigated by dibenzothiophene (DBT) adsorption, which requires 蟺鈥撓€ interactions between the free 蟺-bonds of sp² atoms from graphene and those from the aromatic ring of DBT. The graphene obtained from GOP showed higher DBT adsorption capacity than that synthesized from GOH. In addition, the DBT adsorption capacity on graphene decreased as the concentrations of other aromatic compounds increased.