Role of graphite precursor in the performance of graphite oxides as ammonia adsorbents
Role of graphite precursor in the performance of graphite oxides as ammonia adsorbents
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DOI：
10.1016/j.carbon.2008.10.020
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发表时间：
2009-02
期刊：
影响因子：
10.9
通讯作者：
M. Seredych;C. Petit;Albert V. Tamashausky;T. Bandosz
中科院分区：
文献类型：
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作者：
M. Seredych;C. Petit;Albert V. Tamashausky;T. Bandosz
以三种市售石墨为原料合成了氧化石墨。在干态和湿态条件下，将样品用作氨的吸附剂。测得达到10wt%的异常高的容量。采用氮气吸附、XRD、FTIR、TA和电位滴定法对初始和耗尽材料进行表征。结果表明，根据石墨前体的类型，吸附剂的质地和化学性质的差异，其特征决定了氨吸附的机制。强吸附的物种要么与羧基相互作用形成盐，要么与环氧基相互作用形成胺。少量的氨通过分散相互作用被弱吸附或溶解在吸附水膜中。随着初始石墨中无定形碳浓度的增加，衍生的氧化石墨上的氨去除能力提高。
Graphite oxide was synthesized from three commercial graphites. The samples were used as adsorbents of ammonia at dry and wet conditions. Exceptionally high capacities reaching 10wt% were measured. The initial and exhausted materials were characterized using adsorption of nitrogen, XRD, FTIR, TA, and potentiometric titration. The results showed differences in the texture and chemistry of adsorbents depending on the type of graphite precursor whose features determine the mechanism of ammonia adsorption. The strongly adsorbed species are either interacting with carboxylic groups to form salts, or with epoxy groups to form amines. A small amount of ammonia is weakly adsorbed via dispersive interactions or dissolved in the film of adsorbed water. As the concentration of amorphous carbon in the initial graphite increases, the ammonia removal capacity on the derived graphite oxide is improved.