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Changes in pore properties of phenol formaldehyde-based carbon with carbonization and oxidation conditions
- Source :
- Carbon. 40:2003-2012
- Publication Year :
- 2002
- Publisher :
- Elsevier BV, 2002.
-
Abstract
- Porous carbon beads were prepared by carbonizing at 700 and 1000 °C under N 2 (NN-series) or CO 2 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 m 2 /g, 1000 °C: 780 m 2 /g) compared with those of NN-series samples (700 °C: 380 m 2 /g, 1000 °C: 580 m 2 /g). After acid oxidation, BET surface areas of NN-series samples increased from 580 to 650 m 2 /g, whereas those of CO-series samples decreased from 780 to 600 m 2 /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.
Details
- ISSN :
- 00086223
- Volume :
- 40
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi...........47b38a327cd5ee196ac0915ef833e492