The application of magnetic nanoparticles in waste water treatment is becoming an interesting area of research. The advantages of this separation technology are that the harmful ingredients together with the magnetic particles can be eliminated from the polluted system by a simple magnetic field. It has been used for many applications in biochemistry, cell biology, analytical chemistry, mining, and environmental technology. Magnetic separation has been gradually regarded as a rapid and effective technique for separating magnetic particles. In recent years, magnetic nanoparticles have attracted much attention because of their unique magnetic properties and widespread application in different fields such as mineral separation magnetic storage devices, catalysis, magnetic refrigeration system, heat transfer application in drug delivery system, magnetic resonance imaging (MRI), cancer therapy, and magnetic cell separation. Among several chemical and physical methods, adsorption process is one of the effective techniques that have been successfully employed for color removal from wastewater. From an environmental point of view, the removal of synthetic dyes is of great concern. Moreover, they are very stable to light, temperature and microbial attack, making them recalcitrant compounds. Most of the industrial dyes are toxic, carcinogenic, and teratogen. Organic dyes are widely used in various fields and seriously induce water pollution. The best fit was obtained by the Langmuir model with high correlation coefficients (R 2 = 0.9733) with a maximum monolayer adsorption capacity of 47.0 m g/g. The experimental isotherms data were analyzed using Langmuir and Freundlich isotherm equations. Adsorption kinetic data were properly fitted with the pseudo-second-order kinetic model. The equilibrium uptake was increased with an increase in the initial dye concentration in solution. The maximum adsorption occurred at the pH value of 6.0. ![]() ![]() ![]() The experimental results show that the percentage of adsorption increases with an increase in the adsorbent dosage. The adsorption studies were carried out under various parameters, such as pH, adsorbent dosage, contact time and initial dye concentration. The NiFe 2O 4 nanoparticles were characterized by scanning electron microscope (SEM), Transmission electron microscope (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR). The magnetic NiFe 2O 4 nanoparticles have been synthesized and used as adsorbents for removal of an azo dye, Eriochrome black-T (EBT) from aqueous solution.
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