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Methylene blue number as useful indicator to evaluate the adsorptive capacity of granular activated carbon in batch mode: Influence of adsorbate/adsorbent mass ratio and particle size

AuthorsRaposo Bejines, Francisco ; Rubia, M. Ángeles de la ; Borja Padilla, Rafael
KeywordsMethylene blue (MB)
Basic dye
Granular activated carbon (GAC)
Adsorbate/adsorbent mass ratio
Adsorption isotherm
Langmuir model
Issue Date15-Jun-2009
CitationJournal of Hazardous Materials 165(1-3): 291-299 (2009)
AbstractThe adsorption of methylene blue (MB) on three commercial granular activated carbons (GACs), 12 × 40 mesh size, namely Filtrasorb 400, Norit and Picacarb has been researched. A comparative study of adsorptive capacity using the proposed single-point test and the traditional multi-point isotherm test was carried out. For the single-point test, the influence of some parameters such as MB/GACs mass ratio and contact time were evaluated. For this test the adsorptive capacities of the three GACs studied were 319 ± 14, 280 ± 7 and 260 ± 6 mg g−1 for Filtrasorb 400, Norit and Picacarb, respectively. For multi-point isotherm adsorption test the Langmuir model was used. The parameters involved were obtained by linear and non-linear regression methods. The maximum adsorptive capacity values obtained for both methods were similar and statistically not different than those obtained with the single-point tests. This experimental work also aimed at establishing a relationship between the adsorbent particle size and the adsorptive capacity which could be used complementarily to evaluate the quality of GACs as adsorbents. For a mean particle diameter of 1 mm and after 24 h of contact time the adsorptive capacity values were 255 ± 7, 222 ± 7 and 160 ± 7 mg g−1 for Filtrasorb 400, Norit and Picacarb, respectively.
Publisher version (URL)http://dx.doi.org/10.1016/j.jhazmat.2008.09.106
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