New Insights
into the Sorption and Detoxification
of Chromium(VI) by Tetraethylenepentamine Functionalized Nanosized
Magnetic Polymer Adsorbents: Mechanism and pH Effect
- Publication date
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Abstract
In
this study, sorption and detoxification mechanisms of chromium(VI)
by tetraethylenepentamine (TEPA)-functionalized nanosized magnetic
polymer adsorbents, named as TEPA-NMPs, have been studied. Mechanisms
of adsorption and solid state in situ redox of Cr(VI) at different
pH were proposed based on batch tests, thermodynamic and kinetic studies,
and XPS, XRD, and FTIR analyses of the adsorbents before and after
Cr(VI) adsorption/desorption. The results showed that the adsorption
of Cr(VI) on TEPA-NMPs could be related to electrostatic attraction,
and partially formation of Cr(III) through solid state in situ reduction
of Cr(VI) via charge transport on the surface of the TEPA-NMPs, and
further coordination interactions between Cr(III) and amine groups
(NH<sub>2</sub>). The Fe<sub>3</sub>O<sub>4</sub> magnetic
core, C–O–C and C–OH groups in the adsorbents
might play important roles during the redox process. TEPA-NMPs were
testified to be potential adsorbents for detoxification of Cr(VI)
with high efficiency
