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Cetyltrimethylammonium Bromide-Coated Magnetite Nanoparticles as Highly Efficient Adsorbent for Rapid Removal of Reactive Dyes from the Textile Companies’ Wastewaters

M. Faraji^a, Y. Yamini^a,*, E. Tahmasebi^a, A. Saleh^a and F. Nourmohammadian^b

^aDepartment of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
^bDepartment of Colorant Manufacture, Iran Color Research Center, Tehran, Iran

The utilization of modified magnetite nanoparticles (Fe₃O₄ NPs) with a cationic surfactant (cetyltrimethylammonium bromide (CTAB)) as an efficient adsorbent was successfully carried out to remove reactive black 5 (RBBA), reactive red 198 (RRR) and reactive blue 21 (RTB) dyes from aqueous solutions. First, a reactor was designed to be simple, repeatable and efficient in its synthesis of Fe₃O₄ NPs via co-precipitation method. Then, an orthogonal array design (OAD), four factor-four level (4⁴) matrix was applied to assign affecting factors on removing of the dyes from aqueous solutions. The obtained results from ANOVA showed that the amount of CTAB and NaCl% significantly affect the adsorption of RBBA, RRR and RTB dyes. The sorption kinetics of the dyes were best described by a second-order kinetic model, suggesting chemisorptions mechanism. Also, dye adsorption equilibrium state data were fitted well to the Langmuir isotherm rather than Freundlich isotherm. Also, the maximum monolayer capacity, q_max, obtained from the Langmuir was 312.5, 163.9 and 556.2 mg g^'1 for RBBA, RRR and RTB, respectively. The obtained results in the present study indicated that the CTAB-coated Fe₃O₄ NPs can be an efficient adsorbent material for removal of reactive dyes form aqueous solutions.

Keywords: Magnetite nanoparticles, Reactive dyes, Removal, Orthogonal array design