Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1419012 | Carbon | 2012 | 10 Pages |
Abstract
Porous carbon beads were prepared by carbonizing at 700 and 1000 °C under N2 (NN-series) or CO2 atmospheres (CO-series) and a subsequent oxidization with boiling nitric acid solution (13%, v/v) for 3 h (ANN- and ACO-series). BET surface area of both CO- and NN-series samples tends to increase with increasing carbonization temperature, but CO-series samples show higher BET surface areas (700 °C: 610 m2/g, 1000 °C: 780 m2/g) compared with those of NN-series samples (700 °C: 380 m2/g, 1000 °C: 580 m2/g). After acid oxidation, BET surface areas of NN-series samples increased from 580 to 650 m2/g, whereas those of CO-series samples decreased from 780 to 600 m2/g. On subsequent acid oxidation, acidic surface functional groups increased in both CO- and NN-series samples, but the CO-series samples tend to have much more acidic surface functional groups. Adsorption of halogenated methanes, such as tetra-, tri- and dichloromethanes, onto the samples of CO-, NN-, ACO- and ANN-series was thought to be driven initially by the basicity, but the acidic functional groups that could attract adsorbates via dipole-dipole interaction might hinder the adsorption of subsequently incoming adsorbates.
Related Topics
Physical Sciences and Engineering
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Energy (General)
Authors
Myung Il Kim, Chang Hun Yun, Young Jeon Kim, Chong Rae Park, Michio Inagaki,