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Sorption of acid red 138
from aqueous solutions onto rice bran
S. Hashemian1*,
S. Dadfarnia2, M. R. Nateghi1 and F.
Gafoori1
1Islamic
Azad University, Yazd branch, Department of chemistry, Iran.
2Yazd University, Department of chemistry, Iran.
*Corresponding author. E-mail:
sa_hashemian@yahoo.com
Accepted
23 January, 2008 |
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The capability of rice bran for removal of Nylomine Red (Acid
Red 138) an anionic monoazo direct dye, from aqueous
solutions was studied. The effect of various experimental
parameters such as treatment of the bran, particle size,
contact time, stirring speed, temperature and pH of
solutions were studied, and the optimal conditions were
selected. The dye sorption onto rice bran increased in the
presence of inorganic salt. It was found that the rice bran
with a mesh of 20 and activated with saturated sodium
chloride have higher adsorption capacity. The optimum
reaction time, at a speed of 30 rpm, is 60 min. At initial
pH of 2 and at room temperature, AR 138 was removed more
effectively. The isothermal data for biosorption followed
the Langmuir and Freundlich models.
Key
words:
Acid dye, rice bran, adsorption. |
