Mechanisms of persulfate activation on biochar derived from two different sludges: Dominance of their intrinsic compositions.

Wu, W; Zhu, S; Huang, X; Wei, W; Ni, B-J

Mechanisms of persulfate activation on biochar derived from two different sludges: Dominance of their intrinsic compositions.

Wu, W Zhu, S Huang, X Wei, W

Ni, B-J

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Hazardous Materials, 2021, 408, pp. 1-9
Issue Date:: 2021-04-15

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Field	Value	Language
dc.contributor.author	Wu, W
dc.contributor.author	Zhu, S
dc.contributor.author	Huang, X
dc.contributor.author	Wei, W https://orcid.org/0000-0001-5613-337X
dc.contributor.author	Ni, B-J
dc.date.accessioned	2022-05-10T05:16:45Z
dc.date.available	2020-10-30
dc.date.available	2022-05-10T05:16:45Z
dc.date.issued	2021-04-15
dc.identifier.citation	Journal of Hazardous Materials, 2021, 408, pp. 1-9
dc.identifier.issn	0304-3894
dc.identifier.issn	1873-3336
dc.identifier.uri	http://hdl.handle.net/10453/157205
dc.description.abstract	Sludge-derived biochar (SDBC) has been regarded as persulfate (PS) activator during the remediation of organic contamination. However, the complexity of sludge composition makes it difficult to predict the activity of SDBC and the efficacy of PS. To improve the understanding of how the composition of sludge regulated activity of its parent SDBC towards PS activation, we used two SDBCs derived from different sludges with significantly different organic compositions and metals. Results indicated the higher content of organic and nitrogen content in sludge led to higher polymerization and condensation of carbon layer and more moieties in SDBC1, whereas more Fe species (e.g. Fe-O, Fe2+ and Fe3+) formed in SDBC2. According to the results of phenol (PN) degradation in SDBC/PS, the apparent rate constants (kobs) of SDBC2-700 (0.0037 min-1) was 2 folds higher than that of SDBC1-700 (0.0016 min-1), whereas the SDBC1-500 (6.0 ×10-4 min-1) exhibited higher kobs than that of SDBC2-500 (4.9 ×10-4 min-1). The difference of PS activation by different SDBCs mainly relied on generated reactive oxygen species (ROS). The persistent free radicals (PFRs) and Fe species acted as redox sites for generated ROS, which were depended on the organic compositions and involved metals in used sludges.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Hazardous Materials
dc.relation.isbasedon	10.1016/j.jhazmat.2020.124454
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 05 Environmental Sciences, 09 Engineering
dc.subject.classification	Strategic, Defence & Security Studies
dc.subject.mesh	Charcoal
dc.subject.mesh	Metals
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Sewage
dc.subject.mesh	Charcoal
dc.subject.mesh	Metals
dc.subject.mesh	Oxidation-Reduction
dc.subject.mesh	Sewage
dc.subject.mesh	Charcoal
dc.subject.mesh	Metals
dc.subject.mesh	Sewage
dc.subject.mesh	Oxidation-Reduction
dc.title	Mechanisms of persulfate activation on biochar derived from two different sludges: Dominance of their intrinsic compositions.
dc.type	Journal Article
utslib.citation.volume	408
utslib.location.activity	Netherlands
utslib.for	03 Chemical Sciences
utslib.for	05 Environmental Sciences
utslib.for	09 Engineering
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	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-05-10T05:16:43Z
pubs.publication-status	Published
pubs.volume	408

Abstract:

Sludge-derived biochar (SDBC) has been regarded as persulfate (PS) activator during the remediation of organic contamination. However, the complexity of sludge composition makes it difficult to predict the activity of SDBC and the efficacy of PS. To improve the understanding of how the composition of sludge regulated activity of its parent SDBC towards PS activation, we used two SDBCs derived from different sludges with significantly different organic compositions and metals. Results indicated the higher content of organic and nitrogen content in sludge led to higher polymerization and condensation of carbon layer and more moieties in SDBC1, whereas more Fe species (e.g. Fe-O, Fe2+ and Fe3+) formed in SDBC2. According to the results of phenol (PN) degradation in SDBC/PS, the apparent rate constants (kobs) of SDBC2-700 (0.0037 min-1) was 2 folds higher than that of SDBC1-700 (0.0016 min-1), whereas the SDBC1-500 (6.0 ×10-4 min-1) exhibited higher kobs than that of SDBC2-500 (4.9 ×10-4 min-1). The difference of PS activation by different SDBCs mainly relied on generated reactive oxygen species (ROS). The persistent free radicals (PFRs) and Fe species acted as redox sites for generated ROS, which were depended on the organic compositions and involved metals in used sludges.

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http://hdl.handle.net/10453/157205