Facet Dependent Catalytic Activity of Pd Nanocrystals for the Remedy of Organic Pollutant: A Mechanistic Study

Altaee, A; Yadav, S; Samal, A

Facet Dependent Catalytic Activity of Pd Nanocrystals for the Remedy of Organic Pollutant: A Mechanistic Study

Altaee, A

Yadav, S Samal, A

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Applied Surface Science, 2021
Issue Date:: 2021-09-04

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Field	Value	Language
dc.contributor.author	Altaee, A https://orcid.org/0000-0001-9764-3974
dc.contributor.author	Yadav, S
dc.contributor.author	Samal, A
dc.date.accessioned	2021-09-04T07:30:36Z
dc.date.available	2021-09-04T07:30:36Z
dc.date.issued	2021-09-04
dc.identifier.citation	Applied Surface Science, 2021
dc.identifier.issn	0169-4332
dc.identifier.uri	http://hdl.handle.net/10453/150322
dc.description.abstract	The facet effect and underlying molecular mechanisms of noble metal-based nanocrystals have shown promise as a potential candidate for various applications including catalysis and soil-water remediation. Facet-dependent catalytic activities of Palladium (Pd) nanocrystals have great significance in the field of catalysis. In this report, the well-known seed-mediated synthesis method has been used to synthesize three different Pd nanostructures of cuboctahedral (Coh), octahedral (Oh), and nanocubes (NCs). By changing the time and temperature, the growth of nanocrystals was directed along different low index planes such as {100} for NCs, {111} for Oh, and mixed planes of {100} and {111} for Coh structures. Shape-controlled Pd nanocrystals with distinctly varied surface facets were used to conduct a mechanistic study for the remediation of organic dyes. To understand the facets dependent catalysis, nanocrystals were employed for the reduction of organic pollutant 4-Nitroaniline (4-NA) to 4-Phenylenediamine (4-PDA), and the substituent effect of nitro (–NO2) groups were studied. By keeping the total surface area of particles unchanged, different volumes of nanocrystals were taken into account to carry out an accurate facet-dependent analysis. Further to extend the catalytic activity study, degradation of cationic dye, Rhodamine B (Rh B), and anionic dye, Methyl Orange (MO) were performed. The reduction and degradation processes were monitored through UV-Visible absorption spectroscopy. It was confirmed from the absorption spectra that the efficiency of Pd NCs was higher than Oh and Coh nanocrystals, which established the depiction of the best role of {100} plane out of the other two planes exposed on the surface. The catalytic trends for the asymmetric growth of planes follows the order of NCs {100}> Oh {111}> Coh {100} {111}. The specific reactivity performance of the nanocrystals was confirmed using an analytical model.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Applied Surface Science
dc.relation.isbasedon	10.1016/j.apsusc.2021.150775
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Applied Physics
dc.title	Facet Dependent Catalytic Activity of Pd Nanocrystals for the Remedy of Organic Pollutant: A Mechanistic Study
dc.type	Journal Article
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
utslib.copyright.embargo	2023-09-01T00:00:00+1000Z
dc.date.updated	2021-09-04T07:30:30Z
pubs.publication-status	Published

Abstract:

The facet effect and underlying molecular mechanisms of noble metal-based nanocrystals have shown promise as a potential candidate for various applications including catalysis and soil-water remediation. Facet-dependent catalytic activities of Palladium (Pd) nanocrystals have great significance in the field of catalysis. In this report, the well-known seed-mediated synthesis method has been used to synthesize three different Pd nanostructures of cuboctahedral (Coh), octahedral (Oh), and nanocubes (NCs). By changing the time and temperature, the growth of nanocrystals was directed along different low index planes such as {100} for NCs, {111} for Oh, and mixed planes of {100} and {111} for Coh structures. Shape-controlled Pd nanocrystals with distinctly varied surface facets were used to conduct a mechanistic study for the remediation of organic dyes. To understand the facets dependent catalysis, nanocrystals were employed for the reduction of organic pollutant 4-Nitroaniline (4-NA) to 4-Phenylenediamine (4-PDA), and the substituent effect of nitro (–NO2) groups were studied. By keeping the total surface area of particles unchanged, different volumes of nanocrystals were taken into account to carry out an accurate facet-dependent analysis. Further to extend the catalytic activity study, degradation of cationic dye, Rhodamine B (Rh B), and anionic dye, Methyl Orange (MO) were performed. The reduction and degradation processes were monitored through UV-Visible absorption spectroscopy. It was confirmed from the absorption spectra that the efficiency of Pd NCs was higher than Oh and Coh nanocrystals, which established the depiction of the best role of {100} plane out of the other two planes exposed on the surface. The catalytic trends for the asymmetric growth of planes follows the order of NCs {100}> Oh {111}> Coh {100} {111}. The specific reactivity performance of the nanocrystals was confirmed using an analytical model.

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