dc.contributor.author |
Matsena, Mpumelelo Thomas
|
|
dc.contributor.author |
Chirwa, Evans M.N.
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|
dc.date.accessioned |
2022-10-14T09:38:16Z |
|
dc.date.available |
2022-10-14T09:38:16Z |
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dc.date.issued |
2021-08-17 |
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dc.description.abstract |
The discharge of hexavalent chromium [Cr(VI)] from several anthropogenic activities leads to environmental pollution. In this study, we explore a simple yet cost effective method for the synthesis of palladium (Pd) nanoparticles for the treatment of Cr(VI). The presence of elemental Pd [Pd(0)] was confirmed by scanning electron microscope (SEM), electron dispersive spectroscopy and X-ray diffraction (XRD). We show here that the biologically synthesized nanoparticles (Bio-PdNPs) exhibit improved catalytic reduction of Cr(VI) due to their size being smaller and also being highly dispersed as compared to chemically synthesized nanoparticles (Chem-PdNPs). The Langmuir–Hinshelwood mechanism was successfully used to model the kinetics. Using this model, the Bio-PdNPs were shown to perform better than Chem-PdNPs due to the rate constant (kbio = 6.37 mmol s−1 m−2) and Cr(VI) adsorption constant (KCr(VI),bio = 3.11 × 10−2 L mmol−1) of Bio-PdNPs being higher than the rate constant (kchem = 3.83 mmol s−1 m−2) and Cr(VI) adsorption constant (KCr(VI),chem = 1.14 × 10−2 L mmol−1) of Chem-PdNPs. In addition, product inhibition by trivalent chromium [Cr(III)] was high in Chem-PdNPs as indicated by the high adsorption constant of Cr(III) in Chem-PdNPs of KCr(III),chem = 52.9 L mmol−1 as compared to the one for Bio-PdNPs of KCr(III),bio = 2.76 L mmol−1. |
en_US |
dc.description.department |
Chemical Engineering |
en_US |
dc.description.uri |
http://www.nature.com/srep/index.html |
en_US |
dc.description.uri |
https://www.nature.com/srep |
en_US |
dc.identifier.citation |
Matsena, M.T., Chirwa, E.M.N. Comparative analysis of biological versus chemical synthesis of palladium nanoparticles for catalysis of chromium (VI) reduction. Scientific Reports 11, 16674 (2021). https://doi.org/10.1038/s41598-021-96024-0. |
en_US |
dc.identifier.issn |
2045-2322 (online) |
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dc.identifier.other |
10.1038/s41598-021-96024-0 |
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dc.identifier.uri |
https://repository.up.ac.za/handle/2263/87711 |
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dc.language.iso |
en |
en_US |
dc.publisher |
Nature Research |
en_US |
dc.rights |
© The Author(s) 2021. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License. |
en_US |
dc.subject |
Palladium nanoparticles |
en_US |
dc.subject |
Chromium |
en_US |
dc.subject |
Biological synthesis |
en_US |
dc.subject |
Chemical synthesis |
en_US |
dc.subject |
Scanning electron microscopy (SEM) |
en_US |
dc.subject |
Electron dispersive spectroscopy |
en_US |
dc.subject |
X-ray diffraction (XRD) |
en_US |
dc.subject |
Biologically synthesized nanoparticles (Bio-PdNPs) |
en_US |
dc.title |
Comparative analysis of biological versus chemical synthesis of palladium nanoparticles for catalysis of chromium (VI) reduction |
en_US |
dc.type |
Article |
en_US |