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Background and Objectives: Azolla Filiculoides as a non-living fern was used in a
batch system to remove "Basic Blue 3", which is a cationic dye and a
carcinogenic agent.
Materials and Methods: We used a batch system by applying certain concentrations of dye contaminant
and in the presence of a certain amount of adsorbent under optimum conditions.
The main groups presenting in the Azolla cell wall were evaluated by
acidification and alkalization of Azolla's media and then potentiometric
titration with standard basic and acidic solutions.
Results: It was
observed that the removal efficiency of dye using non-living Azolla in
accordance with the Langmuir isotherms was 82% for the initial dye
concentration of 200 mg/lit under reaction conditions consisting of contact
time 6 h, pH= 6, temperature 25 ˚C, and dose 5 g/lit. Q
max (maximum
uptake capacity) by the activated Azolla at three temperatures 5, 25 and 50 ˚C
was 0.732, 0.934, and 1.176 mmol/g respectively. ΔG (Gibbs free energy changes)
was obtained for these temperatures as -0.457, -0.762, and -1.185 kJ/mol
respectively.
Conclusion: Removal of
basic blue 3 using Azolla is an economically and effective method.
