Bio-Sorption Isotherm and Kinetic Study of Acid Red 14 from Aqueous Solution By Using Azolla A.Filiculodes

In this study, bio-sorption of Acid Red 14 (AR14) dye has been investigated at 336 hours in a batch system by Azolla A.filiculodes species. The experiments were done for five different dye initial concentrations (15, 30, 45, 60, 75 mg/L) at different contact times, temperature ranges 25-30°C (environmental temperature) and pH equal to 7. The results showed that removal percentage of AR14 dye was reduced with initial concentration of dye and contact time rising. The highest removal capacity was reported 64.5% in initial concentration of 15 mg/L. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich adsorption isothermal models were investigated for this living species in different concentrations. Comparison of experimental results to models was illustrated that the process imitated from Dubinin-Radushkevich isotherm. In addition, survey of pseudofirst and second order kinetics models presented that the bio-sorption process was compatible to pseudo-second order kinetics equation.