Catalytic Reduction of Hexavalent Chromium Using Palladium Nanoparticles: An Undergraduate Nanotechnology Laboratory

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dc.contributor.author Naumih, Noah
dc.contributor.author Sadik, Omowunmi A.
dc.contributor.author Okello, Veronica A.
dc.contributor.author Sun, Zhaoyong
dc.date.accessioned 2015-09-30T11:22:54Z
dc.date.available 2015-09-30T11:22:54Z
dc.date.issued 2013
dc.identifier.issn 0021-9584
dc.identifier.uri http://erepo.usiu.ac.ke/11732/1179
dc.description A journal article by Dr. Naumih M. Noah a lecturer at United States International University - Africa. en_US
dc.description.abstract Quercetin is a naturally occurring flavonoid that is known to form complexes with metals; a process that reduces the environmental availability of toxic metals such as chromium. We hereby report the first evidence of the removal of Cr(VI) from environmental samples using quercetin (QCR) and two synthetic derivatives: namely quercetin pentaphosphate (QPP) and quercetin sulfonic acid (QSA). We successfully synthesized both QPP and QSA using simple procedures while characterizing them with UV-vis spectroscopy, H1-NMR, 13C NMR, 31P-NMR, and LC-MS techniques. The solubility of QPP was found to be 840 mg/mL and aqueous solutions of both QPP and QSA were stable for over a period of 1 year. Quercetin and these derivatives were subsequently utilized for the reduction of Cr(VI) and QCR was found to have a higher reduction efficiency of 99.8% (30 min), followed by QPP/palladium nanoparticles mixture (PdNPs) at 96.5% (60 min), and finally QSA/PdNPs mixtures at 91.7% (60 min). PdNPs catalyst increased the efficiency by ∼36.5% while a change in operating temperature from 25 to 45 °C improved the efficiency by ∼46.8%. Electron paramagnetic resonance spectroscopy was used to confirm the presence of Cr (III) in the reaction products. This reduction approach was validated in environmental (Binghamton University) BU and standard reference material (BRS) soil samples. Results showed that the analysis could be completed within one hour and the efficiency was higher in BU soil than in BRS soil by 16.1%. QPP registered the highest % atom economy of 94.6%. This indicates enhanced performance compared to bioremediation approach that requires several months to achieve about 90% reduction efficiency. en_US
dc.publisher Journal of Chemical Education en_US
dc.subject Upper-Division Undergraduate en_US
dc.subject Analytical Chemistry en_US
dc.subject Environmental Chemistry en_US
dc.subject Laboratory Instruction en_US
dc.subject Hands-On Learning/Manipulatives en_US
dc.subject Instrumental Methods en_US
dc.subject Oxidation/Reduction en_US
dc.subject Nanotechnology en_US
dc.subject UV-Vis Spectroscopy en_US
dc.title Catalytic Reduction of Hexavalent Chromium Using Palladium Nanoparticles: An Undergraduate Nanotechnology Laboratory en_US
dc.type Article en_US

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