Ceftriaxone sodium degradation by carbon quantum dots (CQDs)-decorated C-doped α-Bi2O3 nanorods.

Sun, X; Pan, Y; Song, Y; Liu, W; Nghiem, LD; Wang, Q; Cai, Z

Ceftriaxone sodium degradation by carbon quantum dots (CQDs)-decorated C-doped α-Bi2O3 nanorods.

Sun, X Pan, Y Song, Y Liu, W Nghiem, LD Wang, Q

Cai, Z

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Environ Sci Ecotechnol, 2023, 13, pp. 100219
Issue Date:: 2023-01

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Field	Value	Language
dc.contributor.author	Sun, X
dc.contributor.author	Pan, Y
dc.contributor.author	Song, Y
dc.contributor.author	Liu, W
dc.contributor.author	Nghiem, LD
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Cai, Z
dc.date.accessioned	2022-12-07T10:33:00Z
dc.date.available	2022-11-01
dc.date.available	2022-12-07T10:33:00Z
dc.date.issued	2023-01
dc.identifier.citation	Environ Sci Ecotechnol, 2023, 13, pp. 100219
dc.identifier.issn	2096-9643
dc.identifier.issn	2666-4984
dc.identifier.uri	http://hdl.handle.net/10453/164201
dc.description.abstract	A novel carbon quantum dots decorated C-doped α-Bi2O3 photocatalyst (CBO/CQDs) was synthesized by solvothermal method. The synergistic effect of adsorption and photocatalysis highly improved contaminants removal efficiencies. The ceftriaxone sodium degradation rate constant (k) of CBO/CQDs was 11.4 and 3.2 times that of pure α-Bi2O3 and C-doped α-Bi2O3, respectively. The interstitial carbon doping generated localized states above the valence band, which enhanced the utilization of visible light and facilitated the separation of photogenerated electrons and holes; the loading of CQDs improved the charge carrier separation and extended the visible light response; the reduced particle size of CBO/CQDs accelerated the migration of photogenerated carriers. The •O2 - and h+ were identified as the dominant reactive species in ceftriaxone sodium degradation, and the key role of •O2 - was further investigated by NBT transformation experiments. The Fukui index was applied to ascertain the molecular bonds of ceftriaxone sodium susceptible to radical attack, and intermediates analysis was conducted to explore the possible degradation pathways. The toxicity evaluation revealed that some degradation intermediates possessed high toxicity, thus the contaminants require sufficient mineralization to ensure safe discharge. The present study makes new insights into synchronous carbon dopping and CQDs decoration on modification of α-Bi2O3, which provides references for future studies.
dc.format	Electronic-eCollection
dc.language	eng
dc.publisher	Elsevier BV
dc.relation.ispartof	Environ Sci Ecotechnol
dc.relation.isbasedon	10.1016/j.ese.2022.100219
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Ceftriaxone sodium degradation by carbon quantum dots (CQDs)-decorated C-doped α-Bi2O3 nanorods.
dc.type	Journal Article
utslib.citation.volume	13
utslib.location.activity	Netherlands
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	*
dc.date.updated	2022-12-07T10:32:47Z
pubs.publication-status	Published online
pubs.volume	13

Abstract:

A novel carbon quantum dots decorated C-doped α-Bi2O3 photocatalyst (CBO/CQDs) was synthesized by solvothermal method. The synergistic effect of adsorption and photocatalysis highly improved contaminants removal efficiencies. The ceftriaxone sodium degradation rate constant (k) of CBO/CQDs was 11.4 and 3.2 times that of pure α-Bi2O3 and C-doped α-Bi2O3, respectively. The interstitial carbon doping generated localized states above the valence band, which enhanced the utilization of visible light and facilitated the separation of photogenerated electrons and holes; the loading of CQDs improved the charge carrier separation and extended the visible light response; the reduced particle size of CBO/CQDs accelerated the migration of photogenerated carriers. The •O2 - and h+ were identified as the dominant reactive species in ceftriaxone sodium degradation, and the key role of •O2 - was further investigated by NBT transformation experiments. The Fukui index was applied to ascertain the molecular bonds of ceftriaxone sodium susceptible to radical attack, and intermediates analysis was conducted to explore the possible degradation pathways. The toxicity evaluation revealed that some degradation intermediates possessed high toxicity, thus the contaminants require sufficient mineralization to ensure safe discharge. The present study makes new insights into synchronous carbon dopping and CQDs decoration on modification of α-Bi2O3, which provides references for future studies.

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http://hdl.handle.net/10453/164201