AN EXPERIMENTAL STUDY ON THE EFFICIENCY OF CHROMIUM (VI) REMOVAL WITH STARCH-MAGNETITE NANOCOMPOSITE (Starch@MNPs)

Abstract

Nowadays, magnetic nanoadsorbents are used commonly in the removal of heavy metal ions from wastewater. In this study, we prepared starch-coated magnetic nanoparticles (Starch@MNPs) by the co-precipitation method, and used to remove Cr(VI) ions from water. Several batch experiments were performed to determine optimum conditions in the adsorption studies for Starch@MNPs such as pH, contact time, temperature, chromium ion and adsorbent concentrations. The synthesized Starch@MNPs were analyzed by Scanning Electron Microscopy (SEM) to illustrate the shape and surface properties of the nanoparticles. In order to define characterization of the adsorbent, Fourier-transform infrared spectroscopy (FTIR) and Energy Dispersive X-Ray Analysis (EDX) techniques were also used. The experimental data were compared with isotherm and kinetic models in order to determine the most suitable for fitting. The results showed that Cr (VI) adsorption of Starch@MNPs was more suitable for Temkin isotherm and Psedudo-second kinetic model, respectively. The maximum adsorption efficiency (98%) of Cr (VI) in 10 mg/L initial concentration was obtained at contact time of 60 min., pH 4.0 and adsorbent concentration of 2.0 g/L. The obtained data from the study showed that Starch@MNPs have quite high separation efficiency for Cr(VI) ions and also showed that this adsorbent can be used as a promising adsorbent in future adsorption studies.

Keywords

• Adsorption,Chromium,Nanocomposite,Nanomagnetite

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