Vol.3 No.5 (September 2013)
The Adsorption Studies of Methylene Blue onto Montmorillonite
Montmorillonite was tested as an adsorbent for methylene blue (MB) removal from aqueous solution. The effect of various experimental parameters was investigated using a batch of adsorption techniques. In this manner, pH, amount of adsorbent, MB initial concentration, temperature which may affect MB adsorption on Montmorillonite were thoroughly examined. The absorption isotherm, adsorption kinetics were also researched. Results showed that a pH value of 5.0 was favorable for the adsorption of MB. Amount of MB adsorbed at equilibrium time (qe) decreased as the amount of adsorbent increased. The qe of the adsorbents increased gradually with the increment of MB initial concentration, but decreased gradually with adsorption temperature increasing. The isothermal data could be well described by Langmuir equation. The dynamical data fitted well with the pseudo-second-order kinetic model. The results laid the theoretical foundation for application of Montmorillonite which could be used as adsorbent in wastewater treatment.
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