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Background & Aims of the Study: Organic dyes with a complex structure are often toxic, carcinogenic, mutagenic, non-biodegradation and stable in the environment and if released to the environment without treatment can endanger the environment and human health. The aim of this study was to evaluate the performance of H₂O₂ and H₂O₂/Fe⁰ Iron in removal of dye Acid Red 18 from aqueous solutions.

Materials & Methods: This study was conducted at the laboratory scale. In this study, the removal efficiency of Acid Red 18 from a synthetic solution by H₂O₂ and H₂O₂/Fe⁰ was investigated. As well as Effect of solution pH, dye concentration, Concentration of Nanoscale Zero-Valent Iron, H₂O₂ and contact time in decolorization efficiency was investigated.

Results: Results show that in pH=3, Contact time of 80 minutes, dye concentration of 50 mg/l and Concentration of Nanoscale Zero-Valent Iron of 2 g/l and H₂O₂ concentration equal to 200 mmol/l, the removal efficiency was about 98%.