Center for Superfunctional Materials, Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, Korea.
Nanotechnology. 2013 Jun 14;24(23):235703. doi: 10.1088/0957-4484/24/23/235703. Epub 2013 May 13.
For effective adsorption of carbon dioxide (CO2), we investigate a porous N functionalized graphene adsorbent produced by the chemical activation of a reduced graphene oxide/polyaniline composite. The N-doped graphene composite is microporous with a maximum BET surface area of 1336 m(2) g(-1). It shows a highly reversible maximum CO2 storage capacity of 2.7 mmol g(-1) at 298 K and 1 atm (5.8 mmol g(-1) at 273 K and 1 atm). The N-doped graphene shows good stability during recycling with only an initial decrease of 10% (3-2.7 mmol g(-1)) in adsorption capacity before attaining a cycling equilibrium. The adsorbance capacity is correlated with N content × pore volume or N content × surface area. Given that there is no proper correlation parameter, these factors can be used to increase the CO2 adsorption capacity of N-doped graphene materials for practical utility. The as synthesized material also displays selectivity towards CO2 adsorption compared to H2, N2, Ar or CH4. The as formed material shows that graphene can be uniformly N-doped using the presented synthetic method.
为了有效地吸附二氧化碳（CO2），我们研究了一种通过还原氧化石墨烯/聚苯胺复合材料的化学活化制备的多孔 N 功能化石墨烯吸附剂。N 掺杂石墨烯复合材料具有微孔结构，最大 BET 比表面积为 1336 m(2) g(-1)。它在 298 K 和 1 大气压下显示出极高的可逆最大 CO2 储存容量为 2.7 mmol g(-1)（在 273 K 和 1 大气压下为 5.8 mmol g(-1)）。N 掺杂石墨烯在回收过程中表现出良好的稳定性，在达到循环平衡之前，吸附容量仅初始下降 10%（从 3-2.7 mmol g(-1)）。吸附容量与 N 含量×孔体积或 N 含量×表面积相关。由于没有合适的相关参数，这些因素可以用来提高 N 掺杂石墨烯材料的 CO2 吸附容量，以满足实际应用的需要。与 H2、N2、Ar 或 CH4 相比，所合成的材料对 CO2 吸附也表现出选择性。所形成的材料表明，通过所提出的合成方法可以均匀地对石墨烯进行 N 掺杂。
