چكيده لاتين :
This study is to inspect how the variation of molecular structures and functional groups present in
our models, monoazo dye (Tartrazine) and diazo dye (Ponceau), affects decolorization capabilities of green
algae, cyanobacteria and diatoms. The results revealed that the removal of azo dyes was rapid at the initial
period of study (3 days) and became slowly with the time (6 days). The maximum decolorization was observed
at 5 ppm Tartrazine with S. bijugatus (68%) andN muscourm after 6 days incubation. The reduction of color
removal appears to be related to the molecular structure of the dyes and species of algae used. The culture of
the diatom Nitzschia perminuta was completely died after 2 days of incubation. Azo reductase of algae, which
is responsible for degradation of azo dyes into aromatic amine by breaking the azo linkage, was estimated. IR
spectra represented a new peak at 3300 ern-1 and a reduction in the azo band at 1642-1631 ern-1. In order to
investigate the sorption behavior of algae, Langmuir equilibrium model was tested.
