en بهداشت Health پژوهشي Original Article <p>Background and Purpose: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 was to evaluate the performance nanoscalezero-valent iron (NZVI) in the removal of dye acid red 18 (AR18) from aqueous solutions. Materials and Methods:This study was conducted at the laboratory scale. In this study, the removal efficiency of AR18 from a synthetic solution by NZVI was investigated. As well as the effect of solution pH, dye concentration, the concentration of NZVI and contact time in decolorization efficiency was investigated. Results:The results show that in pH = 3, contact time of 80 minutes, dye concentration of 25 mg/l and concentration of NZVI of 2 g/l, the removal efficiency was about 94%. Conclusion:According to the results of experiments, NZVI has high efficiency in removal of AR18 from aqueous solution.</p> Acid Red 18 (AR18), Dye Removal, NanoscaleZero-Valent Iron 63 69 http://jhs.mazums.ac.ir/browse.php?a_code=A-10-460-3&slc_lang=en&sid=1 Ahmad Reza Yari 10031947532846003108 10031947532846003108 No Shahram Nazari shahramnazari73@yahoo.com 10031947532846003109 10031947532846003109 Yes Ayoob Rastegar 10031947532846003110 10031947532846003110 No Soudabeh Alizadeh-Matboo 10031947532846003111 10031947532846003111 No Gharib Majidi 10031947532846003112 10031947532846003112 No Mehdi Tanhaye-Reshvanloo 10031947532846003113 10031947532846003113 No