Evaluation of adsorption potential of adsorbents: a case of uptake of cationic dyes.
J Environ Biol
;
2008 Jan; 29(1): 31-6
Article
in English
| IMSEAR
| ID: sea-113795
ABSTRACT
Adsorption potential of a commercial activated carbon (FS300) has been evaluated for the uptake of cationic dyes namely methylene blue (MB) and rhodamine B (RB). Though, there are numerous studies in literature which report the sorption of MB (more than 40 studies) and RB (more than 10), however none of these use a common parameter to report the capacity of the sorbent. A protocol, based on the equilibrium dye concentration has been proposed to measure the sorption potential of a sorbent. The Langmuir model can very well describe the experimental equilibrium data for both dyes (coefficient of correlation > 0.999). MB (Qm = 312.5 mg g(-1)) is more adsorbable than the RB (Qm = 144.9 mg g(-1)). Molecular weight and chemical structure of dye molecules seem to affect the dye uptake. The effect of pH on dye uptake has also been evaluated by varyingpH from 3 to 11. Uptake of MB increases with pH, wherein RB removal decreases with pH. Dyes could not be desorbed either by distilled water (0.06 and 0.11% for MB and RB respectively), or by 0.1 NHCl (0.136 and 3.0% for MB and RB respectively) indicating, chemical adsorption type of adsorbent-adsorbate interactions.
Full text:
Available
Index:
IMSEAR (South-East Asia)
Main subject:
Rhodamines
/
Water Pollutants, Chemical
/
Carbon
/
Cations
/
Waste Disposal, Fluid
/
Water Purification
/
Adsorption
/
Coloring Agents
/
Hydrogen-Ion Concentration
/
Methylene Blue
Type of study:
Evaluation studies
Language:
English
Journal:
J Environ Biol
Year:
2008
Type:
Article
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