Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 6, Pages 2845-2854Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta10394a
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Funding
- National Natural Science Foundation of China [21675127]
- Shaanxi Provincial Science Fund for Distinguished Young Scholars [2018JC-011]
- Capacity Building Project of Engineering Research Center of Qinghai Province [2017-GX-G03]
- Fundamental Research Funds for the Northwest A&F University of China [2014YB093, 2452015257]
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Highly efficient decontamination of naturally occurring As(III) from aqueous media remains a rigorous task for public health and ecosystem protection. As its increasingly acute toxicity and mobile characteristics than those of As(V), it is imperative to exploit a technique for the simultaneous removal and detoxication of As(III). Herein, a novel strategy involving outer and inner structural engineering of an amorphous FeMn-MOF-74 adsorbent was developed via a facile temperature-controlled crystallization method, which integrated the inner amorphous structure with low-coordinated active centers and the outer optimized metal atomic ratio with homogeneous adsorption/oxidation sites for generating the synergistic effects of As(III) removal. An appropriate Fe/Mn ratio (similar to 1.96) with optimized temperature (denoted as aFMM-120) endows the synergic effect of iron and high-valence manganese nodes in the framework with the highest experimental adsorption capacity of 161.6 mg g(-1) among MOF-based arsenic adsorbents. Detailed characterizations through X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy demonstrated the redox behavior of Mn species and surface coordination of oxygen molecules in FeO clusters toward As(III). All these results imply that amorphous aFMM-120 is an effective adsorptive oxidation material for efficient arsenic-contaminated water remediation.
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