title: Application of response surface methodology (RSM) for the removal of methylene blue dye from water by nano zero-valent iron (NZVI).
abstract: In this study, iron zero-valent nanoparticles were synthesized, characterized and studied for removal of methylene blue dye in water solution. The reactions were mathematically described as the function of parameters such as nano zero-valent iron (NZVI) dose, pH, contact time and initial dye concentration, and were modeled by the use of response surface methodology. These experiments were carried out as a central composite design consisting of 30 experiments determined by the 2(4) full factorial designs with eight axial points and six center points. The results revealed that the optimal conditions for dye removal were NZVI dose 0.1-0.9 g/L, pH 3-11, contact time 20-100 s, and initial dye concentration 10-50 mg/L, respectively. Under these optimal values of process parameters, the dye removal efficiency of 92.87% was observed, which very close to the experimental value (92.21%) in batch experiment. In the optimization, R(2) and R(2)adj correlation coefficients for the model were evaluated as 0.96 and 0.93, respectively.
authors.affiliation: Department of Chemistry, North Tehran Branch, Islamic Azad University, P.O. Box 1913674711, Tehran, Iran.
authors.forename: Morteza
authors.initials: M
authors.lastname: Khosravi
authors.affiliation: Department of Chemistry, Safadasht Branch, Islamic Azad University, Safadasht, Iran E-mail: siminarabi1354@yahoo.com.
authors.forename: Simin
authors.initials: S
authors.lastname: Arabi
mesh_terms: D007501:Iron / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D014874:Water Pollutants, Chemical; D007501:Iron; D008751:Methylene Blue