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

Year 2020, Volume: 21 Issue: 2, 322 - 334, 15.06.2020

Rojin Şimşek Buşra Nur Çiftci Yağmur Uysal

https://doi.org/10.18038/estubtda.649785

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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