Highly Efficient Luminescent Metal-Organic Framework for the Simultaneous Detection and Removal of Heavy Metals from Water

Nathan D. Rudd, Hao Wang, Erika M.A. Fuentes-Fernandez, Simon J. Teat, Feng Chen, Gene Hall, Yves J. Chabal, Jing Li

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

We have designed and synthesized an isoreticular series of luminescent metal-organic frameworks (LMOFs) by incorporating a strongly emissive molecular fluorophore and functionally diverse colinkers into Zn-based structures. The three-dimensional porous networks of LMOF-261, -262, and -263 represent a unique/new type of nets, classified as a 2-nodal, (4,4)-c net (mot-e type) with 4-fold, class IIIa interpenetration. All compounds crystallize in a body-centered tetragonal crystal system (space group I41/a). A systematic study has been implemented to analyze their interactions with heavy metals. LMOF-263 exhibits impressive water stability, high porosity, and strong luminescence, making it an excellent candidate as a fluorescent chemical sensor and adsorbent for aqueous contaminants. It is extremely responsive to toxic heavy metals at a parts per billion level (3.3 ppb Hg2+, 19.7 ppb Pb2+) and demonstrates high selectivity for heavy metals over light metals, with detection ratios of 167.4 and 209.5 for Hg2+/Ca2+ and Hg2+/Mg2+, respectively. Mixed-metal adsorption experiments also show that LMOF-263 selectively adsorbs Hg2+ over other heavy metal ions in addition to light metals. The Pb2+ KSV value for LMOF-263 (55,017 M-1) is the highest among LMOFs reported to date, and the Hg2+ KSV value is the second highest (459,446 M-1). LMOF-263 exhibits a maximum adsorption capacity of 380 mg Hg2+/g. The Hg2+ adsorption process follows pseudo-second-order kinetics, removing 99.1% of the metal within 30 min. An in situ XPS study provides insight to help understand the interaction mechanism between Hg2+ and LMOF-263. No other MOFs have demonstrated such a high performance in both the detection and the capture of Hg2+ from aqueous solution.

Original languageEnglish
Pages (from-to)30294-30303
Number of pages10
JournalACS Applied Materials and Interfaces
Volume8
Issue number44
DOIs
Publication statusPublished - Nov 9 2016

Fingerprint

Heavy Metals
Heavy metals
Metals
Water
Light Metals
Light metals
Adsorption
Fluorophores
Poisons
Chemical sensors
Heavy ions
Adsorbents
Metal ions
Luminescence
X ray photoelectron spectroscopy
Porosity
Impurities
Crystals
Kinetics

Keywords

  • heavy metal adsorption
  • heavy metal detection
  • isoreticular series
  • ligand-based emission
  • luminescent metal-organic framework

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Highly Efficient Luminescent Metal-Organic Framework for the Simultaneous Detection and Removal of Heavy Metals from Water. / Rudd, Nathan D.; Wang, Hao; Fuentes-Fernandez, Erika M.A.; Teat, Simon J.; Chen, Feng; Hall, Gene; Chabal, Yves J.; Li, Jing.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 44, 09.11.2016, p. 30294-30303.

Research output: Contribution to journalArticle

Rudd, Nathan D. ; Wang, Hao ; Fuentes-Fernandez, Erika M.A. ; Teat, Simon J. ; Chen, Feng ; Hall, Gene ; Chabal, Yves J. ; Li, Jing. / Highly Efficient Luminescent Metal-Organic Framework for the Simultaneous Detection and Removal of Heavy Metals from Water. In: ACS Applied Materials and Interfaces. 2016 ; Vol. 8, No. 44. pp. 30294-30303.
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