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

Raposo, F., De la Rubia Romero, M.A. and Borja, R. (2008) 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. Journal of Hazardous Materials, 165 (1-3), 291-299. (doi:10.1016/j.jhazmat.2008.09.106).

Abstract

The 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.

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