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Effective parameters for the adsorption of chromium(III) onto iron oxide magnetic nanoparticle
Shahriari, T.; Bidhendi, G. Nabi; Mehrdadi, N. & Torabian, A.
Abstract
Most of the industrial wastewaters comprise
toxic, biologically non-biodegradable, and heavy metals
which tend to accumulate in the biological organisms
causing different diseases. There are some novel technologies
and strategies to remove these pollutants. Using the
magnetic nanoparticles which are cheap, recyclable, and
reusable can be considered as an effective method for
removing the pollutants as they do not require conservation
or complicated equipments. Using this method, dangerous
and rare heavy metals can be restored to the industry. In
this study, magnetic nanoparticles with the size of 30 nm
were prepared and used for the removal of chromium from
synthetic wastewater polluted by chromium sulfate. For
this purpose, removal of various concentrations of chromium(
III) from wastewater was investigated. The best
concentration was achieved in the removal efficiency of
99.1 %. The optimal values of pH, rotation speed of
magnetic stirrer, time, temperature, and the amount of
nanoparticles were determined according to the primary
concentration (500 mg/L). The mechanism of chromium
adsorption onto iron oxide (Fe3O4) magnetic nanoadsorbent
was also investigated. The results showed both Freundlich
and Longmuir isotherms to be the best fit for the
chromium adsorption, with Freundlich isotherm being
more suitable.
Keywords
Chromium removal; Equilibrium time; Nanoadsorbent; pH; Tannery wastewater
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