Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 118, Issue 1-3, Pages 232-238Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2008.08.028
Keywords
Corn grain; Activated carbon; Adsorption; Surface heterogeneity; Methylene blue; Congo red
Categories
Funding
- Korea Science and Engineering Foundation [R01-2005-000-10742-0]
- National Research Foundation of Korea [R01-2005-000-10742-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Activated carbons (R-1/2, R-1/3 and R-1/4) were prepared from a novel corn grain precursor by varying the ratio between the carbonized corn grain char and chemical activating agent. The surface characteristics of corn grain-based activated carbons (CG-ACs) were analyzed by nitrogen adsorption isotherms, adsorption energy distributions (AEDs) and X-ray photoelectron spectroscopy (XPS) to evaluate their structural properties, energetic heterogeneities and surface functional groups. respectively. In addition, methylene blue (MB) and congo red (CR) adsorption capacities of highly porous CG-ACs were also examined. It was found that the physical properties and the liquid phase adsorption capacities of CG-ACs increase with ratio between the carbonized corn grain char and chemical activating agent. The results also indicated the higher MB adsorption capacities of CG-ACs compared to that of CR adsorption. The AED results for N-2, MB and CR on CG-ACs confirmed the energetically heterogeneous solid surface nature of CG-ACs as well as the decrease in adsorption capacity with increasing energetically heterogeneous solid surface. (C) 2008 Elsevier Inc. All rights reserved.
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