期刊
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
卷 17, 期 5, 页码 853-861出版社
SPRINGER
DOI: 10.1007/s10450-011-9344-4
关键词
Activated carbon; Pore size distribution; Slit geometry; Triangular geometry
资金
- CNPq (Brazil)
- CONICET
- FONCYT (Argentina)
- CAPES
- Ministry for Education (Brazil)
- UFC
Controlled series of microporous carbons were prepared through chemical activation with phosphoric acid from peach stones as the precursor material, corresponding to different preparation conditions. Adsorption isotherms of N-2 at 77 K and of CO2 at 273 K were measured to be used in the characterization of the samples. The recently proposed mixed-geometry model (MGM), which assumes that the activated carbon is better represented by a mixture of slit and triangular geometry pores, is used to obtain the PSDs of the samples, on the basis of Grand Canonical Monte Carlo (GCMC) simulated ideal isotherms, both for N-2 at 77 K and of CO2 at 273 K. Our results emerging from the analysis of two families of activated carbons reveal a consistent picture supporting the thesis that the PSDs of the same sample obtained trough N-2 and CO2 adsorption are different, a still controversial issue in the literature. Comparison of predictions from the MGM with those of the pure slit geometry model (PSGM) shows that the former gives a more consistent picture and more similar PSDs for the two adsorbates used.
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