Removal of lead ions from water using thiophene-functionalized metal-organic frameworks
Alissa R Geisse1, Chrispus M Ngule, Douglas T Genna
1Department of Chemistry, Youngstown State University, Youngstown, OH 44555, USA. dtgenna@ysu.edu.
Abstract:
Heavy metal ion contamination in water is a hazard to all life. The removal of such ions from aqueous media by porous metal-organic frameworks (MOFs) is a growing field. Herein we report the use of thiophene containing MOFs, notably DUT-67, for the removal of Pb2+ ions from water under both batch and flow conditions with a max loading of 98.5 mg Pb2+ per g MOF. Solution-phase 207Pb NMR spectroscopy and an observed decrease in adsorption with non-thiophene containing systems support a mechanism of adsorption via a putative 6π-η5-thiophene-Pb2+ coordination.
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