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The study of synthetic optimal conditions for agarose coated magnetite nanoparticles was presented in this work. The magnetite nanoparticles were prepared by using co-precipitation method of Fe(II)/Fe(III). The factors that affected on coating of agarose including agarose and sodium hydroxide concentrations and reaction times were investigated. The prepared particles were characterized by Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM) techniques. Moreover, the conditions for cobalt(II) adsorption using these particles for instant pH of the cobalt(II) solution and adsorption time including elution and adsorption isotherms were studied. The cobalt(II) analysis was determined by using visible spectrophotometry based on colored complex-formation of cobalt(II) and DTZ (dithizone) at lmax 570 nm. It was observed that the adsorption efficiency and percentages of desorption of the synthetic magnetic nanoparticles were 2.93 mg/l and 91 %, respectively.
Keywords: magnetic nanoparticle; agarose; cobalt(II); spectrophotometry; co-precipitation method
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