Abstract
Current technologies for removing heavy metal ions are typically metal ion specific. Herein we report the development of a broad-spectrum heavy metal ion trap by incorporation of ethylenediaminetetraacetic acid into a robust metal-organic framework. The capture experiments for a total of 22 heavy metal ions, covering hard, soft, and borderline Lewis metal ions, show that the trap is very effective, with removal efficiencies of >99% for single-component adsorption, multi-component adsorption, or in breakthrough processes. The material can also serve as a host for metal ion loading with arbitrary selections of metal ion amounts/types with a controllable uptake ratio to prepare well-dispersed single or multiple metal catalysts. This is supported by the excellent performance of the prepared Pd2+-loaded composite toward the Suzuki coupling reaction. This work proposes a versatile heavy metal ion trap that may find applications in the fields of separation and catalysis.
Highlights
Current technologies for removing heavy metal ions are typically metal ion specific
We propose the creation of a broadspectrum heavy metal ion trap (BS-HMT) possessing the following features: strong metal chelating groups implementing non-specific high affinity toward different heavy metal species, high loading amount and atomic-level dispersion of chelating groups thereby affording ordered and high-density accessible binding sites, exceptional water/chemical stability facilitating multiple use and regeneration, and high efficiency in both batch adsorption and breakthrough processes offering potential possibility for practical applications
A schematic illustration of the construction of the BS-HMT is shown in Fig. 1, in which the metal-organic frameworks (MOFs)-based HMT was formed by functionalizing MOF-808 with ethylenediaminetetraacetic acid (EDTA) through solvent-assistant linker exchange method[36] (Fig. 2a, b)
Summary
Current technologies for removing heavy metal ions are typically metal ion specific. we report the development of a broad-spectrum heavy metal ion trap by incorporation of ethylenediaminetetraacetic acid into a robust metal-organic framework. The resulting BS-HMT, MOF-808EDTA, shows good single-component adsorption performance for 22 metal ions, including soft acids, hard acids, and borderline acids, and the removal efficiency is >99% for all cases.
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