Evaluation of adsorption potential of adsorbents: a case of uptake of cationic dyes.
J Environ Biol
;
2008 Jan; 29(1): 31-6
Artigo
em Inglês
| 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.
Texto completo:
DisponíveL
Índice:
IMSEAR (Sudeste Asiático)
Assunto principal:
Rodaminas
/
Poluentes Químicos da Água
/
Carbono
/
Cátions
/
Eliminação de Resíduos Líquidos
/
Purificação da Água
/
Adsorção
/
Corantes
/
Concentração de Íons de Hidrogênio
/
Azul de Metileno
Tipo de estudo:
Estudos de avaliação
Idioma:
Inglês
Revista:
J Environ Biol
Ano de publicação:
2008
Tipo de documento:
Artigo
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