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A New Member of the Graphene Family: Graphene Acid

机译：石墨烯家族的新成员：石墨烯酸

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摘要

A new member of the family of graphene derivatives, namely, graphene acid with a composition close to C-1(COOH)(1), was prepared by oxidation of graphene oxide. The synthetic procedure is based on repeated oxidation of graphite with potassium permanganate in an acidic environment. The oxidation process was studied in detail after each step. The multiple oxidations led to oxidative removal of other oxygen functional groups formed in the first oxidation step. Detailed chemical analysis showed only a minor amount of other oxygen-containing functional groups such as hydroxyl and the dominant presence of carboxyl groups in a concentration of about 30wt%. Further oxidation led to complete decomposition of graphene acid. The obtained material exhibits unique sorption capacity towards metal ions and carbon dioxide. The highly hydrophilic nature of graphene acid allowed the assembly of ultrathin free-standing membranes with high transparency.
机译：通过氧化氧化石墨烯来制备石墨烯衍生物家族的新成员，即具有接近C-1（COOH）（1）的组成的石墨烯酸。合成步骤基于在酸性环境中用高锰酸钾反复氧化石墨。在每个步骤之后都详细研究了氧化过程。多次氧化导致在第一氧化步骤中形成的其他氧官能团的氧化去除。详细的化学分析表明，其他少量的含氧官能团（例如羟基）和羧基的主要存在浓度约为30wt％。进一步氧化导致石墨烯酸完全分解。所获得的材料对金属离子和二氧化碳表现出独特的吸附能力。石墨烯酸的高度亲水性允许组装具有高透明度的超薄自支撑膜。

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