Seawater lithium mining by zeolitic imidazolate framework encapsulated manganese oxide ion sieve nanomaterial

Roobavannan, S; Choo, Y; Truong, DQ; Han, DS; Shon, HK; Naidu, G

Seawater lithium mining by zeolitic imidazolate framework encapsulated manganese oxide ion sieve nanomaterial

Roobavannan, S Choo, Y

Truong, DQ Han, DS Shon, HK Naidu, G

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Publisher:: ELSEVIER SCIENCE SA
Publication Type:: Journal Article
Citation:: Chemical Engineering Journal, 2023, 474
Issue Date:: 2023-10-15

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Field	Value	Language
dc.contributor.author	Roobavannan, S
dc.contributor.author	Choo, Y https://orcid.org/0000-0003-2715-0618
dc.contributor.author	Truong, DQ
dc.contributor.author	Han, DS
dc.contributor.author	Shon, HK
dc.contributor.author	Naidu, G
dc.date.accessioned	2024-04-10T06:32:49Z
dc.date.available	2024-04-10T06:32:49Z
dc.date.issued	2023-10-15
dc.identifier.citation	Chemical Engineering Journal, 2023, 474
dc.identifier.issn	1385-8947
dc.identifier.issn	1873-3212
dc.identifier.uri	http://hdl.handle.net/10453/177662
dc.description.abstract	Lithium (Li) is an increasingly valuable commodity due to its utilization in energy storage devices for electric vehicles. Seawater mining of Li is a sustainable alternative to conventional land mining. Hydrogen manganese oxide (HMO) ion sieve exhibits promising Li selectivity in seawater; however, HMO requires highly alkaline conditions (pH 11–12) to perform, and Mg2+ in seawater severely impedes its performance. In this study, we developed a hybrid nanomaterial, HMO@ZIF, where zeolitic imidazolate frameworks (ZIF) passivated on HMO particles as a high Li-selective material. Molar ratios of the organic precursor to the zinc salt were varied, and it was found that HMO@ZIF(a) (1.6:48:8.4, HMO: 2-methylimidazole (HMIM): Zn) demonstrates the highest Li uptake capacity at seawater pH (8.0 ± 0.5). The Li uptake capacity of HMO@ZIF(a) (Langmuir Qmax 45.51 mg/g) was 2.5 times higher than neat HMO (Langmuir Qmax 18.16 mg/g). Further analysis indicates that the governing mechanism for high Li selectivity is due to the exclusive ion exchange between the proton and Li cation, both in hybrid and neat HMO particles. ZIF encapsulation onto HMO led to a higher surface area, additional functional groups for surface deprotonation, and Zn ion intercalation into the HMO lattice, resulting in enhanced Li uptake with improved kinetics. HMO@ZIF(a) maintained more than 92 % reuse capacity after five regeneration cycles.
dc.language	English
dc.publisher	ELSEVIER SCIENCE SA
dc.relation	http://purl.org/au-research/grants/arc/DE200100661
dc.relation	http://purl.org/au-research/grants/arc/DP230100238
dc.relation	Qatar National Research FundNPRP12S-0227-190166
dc.relation.ispartof	Chemical Engineering Journal
dc.relation.isbasedon	10.1016/j.cej.2023.145957
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 0907 Environmental Engineering
dc.subject.classification	Chemical Engineering
dc.subject.classification	4004 Chemical engineering
dc.subject.classification	4011 Environmental engineering
dc.subject.classification	4016 Materials engineering
dc.title	Seawater lithium mining by zeolitic imidazolate framework encapsulated manganese oxide ion sieve nanomaterial
dc.type	Journal Article
utslib.citation.volume	474
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	0907 Environmental 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	2024-04-10T06:32:47Z
pubs.publication-status	Published
pubs.volume	474

Abstract:

Lithium (Li) is an increasingly valuable commodity due to its utilization in energy storage devices for electric vehicles. Seawater mining of Li is a sustainable alternative to conventional land mining. Hydrogen manganese oxide (HMO) ion sieve exhibits promising Li selectivity in seawater; however, HMO requires highly alkaline conditions (pH 11–12) to perform, and Mg2+ in seawater severely impedes its performance. In this study, we developed a hybrid nanomaterial, HMO@ZIF, where zeolitic imidazolate frameworks (ZIF) passivated on HMO particles as a high Li-selective material. Molar ratios of the organic precursor to the zinc salt were varied, and it was found that HMO@ZIF(a) (1.6:48:8.4, HMO: 2-methylimidazole (HMIM): Zn) demonstrates the highest Li uptake capacity at seawater pH (8.0 ± 0.5). The Li uptake capacity of HMO@ZIF(a) (Langmuir Qmax 45.51 mg/g) was 2.5 times higher than neat HMO (Langmuir Qmax 18.16 mg/g). Further analysis indicates that the governing mechanism for high Li selectivity is due to the exclusive ion exchange between the proton and Li cation, both in hybrid and neat HMO particles. ZIF encapsulation onto HMO led to a higher surface area, additional functional groups for surface deprotonation, and Zn ion intercalation into the HMO lattice, resulting in enhanced Li uptake with improved kinetics. HMO@ZIF(a) maintained more than 92 % reuse capacity after five regeneration cycles.

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http://hdl.handle.net/10453/177662