Synthesis of Core-Shell Magnetic Nanocomposite Fe<inf>3</inf>O<inf>4</inf>@ Microbial Extracellular Polymeric Substances for Simultaneous Redox Sorption and Recovery of Silver Ions as Silver Nanoparticles

Wei, W; Li, A; Pi, S; Wang, Q; Zhou, L; Yang, J; Ma, F; Ni, BJ

Synthesis of Core-Shell Magnetic Nanocomposite Fe<inf>3</inf>O<inf>4</inf>@ Microbial Extracellular Polymeric Substances for Simultaneous Redox Sorption and Recovery of Silver Ions as Silver Nanoparticles

Wei, W

Li, A Pi, S Wang, Q

Zhou, L Yang, J Ma, F Ni, BJ

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: ACS Sustainable Chemistry and Engineering, 2018, 6, (1), pp. 749-756
Issue Date:: 2018-01-02

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Field	Value	Language
dc.contributor.author	Wei, W https://orcid.org/0000-0001-5613-337X
dc.contributor.author	Li, A
dc.contributor.author	Pi, S
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Zhou, L
dc.contributor.author	Yang, J
dc.contributor.author	Ma, F
dc.contributor.author	Ni, BJ
dc.date.accessioned	2022-08-27T23:09:20Z
dc.date.available	2022-08-27T23:09:20Z
dc.date.issued	2018-01-02
dc.identifier.citation	ACS Sustainable Chemistry and Engineering, 2018, 6, (1), pp. 749-756
dc.identifier.issn	2168-0485
dc.identifier.issn	2168-0485
dc.identifier.uri	http://hdl.handle.net/10453/160960
dc.description.abstract	Microbial extracellular polymeric substance (EPS) is a complex high molecular weight compound secreted from many organisms. In this work, magnetic nanocomposite Fe3O4@EPS of Klebsiella sp. J1 were first synthesized for silver ions (Ag+) wastewater remediation, which synergistically combined the advantages of the easy separation property of magnetic Fe3O4 nanoparticles and the superior adsorption capacity of EPS of Klebsiella sp. J1. The physical and chemical properties of Fe3O4@EPS were analyzed comprehensively. Fe3O4@EPS exhibited the well-defined core-shell structure (size 50 nm) with high magnetic (79.01 emu g-1). Batch adsorption experiments revealed that Fe3O4@EPS achieved high Ag+ adsorption capacity (48 mg g-1), which was also much higher than many reported adsorbents. The optimal solution pH for Ag+ adsorption was around 6.0, with the sorption process followed pseudo-second-order kinetics. Ag+ adsorption on Fe3O4@EPS was mainly attributed to the reduction of Ag+ to silver nanoparticles (AgNPs) by benzenoid amine (-NH-), accompanied by the chelation between Ag+ and hydroxyl groups, ion exchange between Ag+ and Mg2+ and K+, and physical electrostatic sorption. The repeated adsorption-desorption experiments showed a good recycle performance of Fe3O4@EPS. This study has great importance for demonstrating magnetic Fe3O4@EPS as potential adsorbent to remove Ag+ from contaminated aquatic systems.
dc.language	English
dc.publisher	AMER CHEMICAL SOC
dc.relation.ispartof	ACS Sustainable Chemistry and Engineering
dc.relation.isbasedon	10.1021/acssuschemeng.7b03075
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0301 Analytical Chemistry, 0502 Environmental Science and Management, 0904 Chemical Engineering
dc.title	Synthesis of Core-Shell Magnetic Nanocomposite Fe<inf>3</inf>O<inf>4</inf>@ Microbial Extracellular Polymeric Substances for Simultaneous Redox Sorption and Recovery of Silver Ions as Silver Nanoparticles
dc.type	Journal Article
utslib.citation.volume	6
utslib.for	0301 Analytical Chemistry
utslib.for	0502 Environmental Science and Management
utslib.for	0904 Chemical 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	*
dc.date.updated	2022-08-27T23:09:18Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	6
utslib.citation.issue	1

Abstract:

Microbial extracellular polymeric substance (EPS) is a complex high molecular weight compound secreted from many organisms. In this work, magnetic nanocomposite Fe3O4@EPS of Klebsiella sp. J1 were first synthesized for silver ions (Ag+) wastewater remediation, which synergistically combined the advantages of the easy separation property of magnetic Fe3O4 nanoparticles and the superior adsorption capacity of EPS of Klebsiella sp. J1. The physical and chemical properties of Fe3O4@EPS were analyzed comprehensively. Fe3O4@EPS exhibited the well-defined core-shell structure (size 50 nm) with high magnetic (79.01 emu g-1). Batch adsorption experiments revealed that Fe3O4@EPS achieved high Ag+ adsorption capacity (48 mg g-1), which was also much higher than many reported adsorbents. The optimal solution pH for Ag+ adsorption was around 6.0, with the sorption process followed pseudo-second-order kinetics. Ag+ adsorption on Fe3O4@EPS was mainly attributed to the reduction of Ag+ to silver nanoparticles (AgNPs) by benzenoid amine (-NH-), accompanied by the chelation between Ag+ and hydroxyl groups, ion exchange between Ag+ and Mg2+ and K+, and physical electrostatic sorption. The repeated adsorption-desorption experiments showed a good recycle performance of Fe3O4@EPS. This study has great importance for demonstrating magnetic Fe3O4@EPS as potential adsorbent to remove Ag+ from contaminated aquatic systems.

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http://hdl.handle.net/10453/160960