removal of acid red 18 dye from aqueous solutions using nanoscale zero-valent iron

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.