Redox mechanisms of conversion of Cr(VI) to Cr(III) by graphene oxide-polymer composite.

Scientific Reports
P C BandaraD F Rodrigues

Abstract

Alternative methods of aqueous chromium removal have been of great research interest in recent years as Cr (VI) is a highly toxic compound causing severe human health effects. To achieve better removal of Cr (VI), it is essential to understand the chemical reactions that lead to the successful removal of Cr species from the solution. Recent studies have demonstrated that graphene oxide (GO) based polymer beads cannot only adsorb Cr (VI) via electrostatic attractions but also reduce it to Cr (III), which is a much less toxic form of chromium. This conversion and the functional groups involved in this conversion, until now, were not elucidated. In the present study, we employed X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy to investigate the conversion pathway of Cr (VI) to Cr (III) in graphene-based polymer beads. The results showed that alcoholic groups are converted to carboxylic groups while reducing Cr (VI) to Cr (III). The inclusion of GO in the polymer beads dramatically increased the potential of Cr (VI) uptake and conversion to Cr (III), indicating polymers and nanomaterials containing alcohol groups can remove and convert chromium in water. Other functional groups present in the polymer be...Continue Reading

References

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Sep 16, 2019·Journal of Colloid and Interface Science·Junyi WangChanglun Chen

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Citations

Sep 6, 2020·Ecotoxicology and Environmental Safety·Ahmad Ali RouhaninezhadMojtaba Norouzi Masir
Apr 15, 2021·Ecotoxicology and Environmental Safety·Jie WangXiaozhi Wang
Jul 16, 2021·Scientific Reports·Andhika Puspito NugrohoTarzan Sembiring
Aug 17, 2021·Journal of Hazardous Materials·Amal Kanti DebMohammad Mahmudur Rahman

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Methods Mentioned

BETA
X-ray
scanning electron microscopy

Software Mentioned

Omnic
Origin
MATLAB

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