The efficiency of eliminating Direct Red 81 by Zero- valent Iron nanoparticles from aqueous solutions using response surface Model (RSM)
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It has been observed numerous adverse environmental effects on Direct Red 81 such as carcinogenicity, mutagenesis and chromosomal damage; therefore, the aim of this study is to analyze the Direct Red 81 using zero-valent iron nanoparticles. Response Surface Model (RSM) was used to optimize the test conditions of eliminating Direct Red 81 from aqueous solutions. Central Composite Design (CCD) was used in this article and the importance and adequacy of the model were analyzed using analysis of variance (ANOVA). After synthesizing the zero-valent iron nanoparticles, their structural features were determined using SEM techniques and X-ray diffraction (XRD) device was used to present zero-valent iron nanoparticles. The effects of dye concentration (10–50 mg/L), contact time (5–25 min), the amount of catalyst (0.1–0.9) and pH (5–9) were investigated to eliminate the dyes. The results showed the method has a high ability to remove Direct Red 81, and color degradation efficiency is also increased by increasing the amount of catalyst and time; and inversely related to the increase of pH and dye concentration.