Removal of Azo Dyes Acid Orange 7 (AO7) and Reactive Black 5 (RB5) by Metallic Iron: Kinetic Study

Subject Areas : environmental management

Alireza Rahmani ¹ , Mansour Zarrabi ² , Mohammad Reza Samarghandi ³ , Abbas Afkhami ⁴ , Saeed Azizian ⁵ , Hamid Reza Ghaffari ⁶

1 - Associate Professor , School of Public Health, Hamadan University of Medical Science
2 - MSc. Student of environmental Health, School of Public Health, Hamadan University of Medical Science
3 - Assistant Professor, School of Public Health, Hamadan University of Medical Science.
4 - Professor, Department of Chemistry, Faculty of Science, Hamadan University of Bu-Ali Sinna.
5 - Associate Professor, Department of Physical-Chemistry, Faculty of Science, Hamadan University of Bu-Ali Sinna
6 - MSc. Student of Environmental Health, School of Public Health, Hamadan University of Medical science

Received: 2009-05-15 Accepted : 2009-10-07 Published : 2013-09-23

Keywords: Metallic iron, acid orange 7, Reactive Black5, batch system/kinetic study,

Abstract :

Bearing organic and inorganic pollutants, colored wastewater are an important source of environmentalpollution. Removal dyes from dyestuff can be accomplished by various methods such as coagulationflocculation,Fenton regent, ozonation and so on. This work investigated metallic iron as an efficient andinexpensive material for treatment of colored wastewater. Parameters such as pH (3, 5, 7, 9 and 11), contacttime (15, 30, 45, 60, 75, 90, 105 and 120 min), iron powder concentration (0.5, 1, 1.5 and 2 g/L) and initialdye concentration (25, 50, 75 and 100 mg/L) were studied. In addition, experimental data were fitted onpseudo- first order, pseudo-second order and modified pseudo-first order kinetic models. Result showedthat dye removal was increased by increasing iron mass and contact time. While decreased by increasingpH of solution. Increasing initial dye concentration of AO7, has increased removal efficiency, while it wasdecreased by increasing initial dye concentration of RB5. In addition, results showed that pseudo-first ordermodel best describe removal of AO7 (r2> 0.9708) and RB5 (r2>0.9776) by metallic iron. We concludedthat metallic iron can be used as an effective an inexpensive matter for treatment of dyestuff waste

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