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Issue 18, 2020
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Constructing amidoxime-modified porous adsorbents with open architecture for cost-effective and efficient uranium extraction

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Abstract

The dense structure of polymeric matrices exposes only 10–20% of adsorption (amidoxime) groups, thus detracting from the extraction efficiency of uranium from seawater. Herein, the amidoxime-modified building units were cross-linked via the Scholl reaction into porous aromatic frameworks (PAFs). Due to the formation of open architecture, PAF adsorbents reveal a larger utilization ratio (>60%) of amidoxime groups. Consequently, PAF samples enable an ultrahigh uranium capacity of 702 mg g−1, which creates a 16-fold capacity enhancement and gains a 7-fold adsorption rate improvement compared with polymer-based adsorbents. Notably, PAF solids are able to be integrated into various devices, thus realizing versatile and efficacious uranium extraction from real seawater (meeting the commercial standard ∼6 mg g−1 in 21 days). In addition, the final cost using our PAF-based adsorbent is US $189.77 per kg uranium, it is in accordance with the prevailing market cost ($100–335 per kg).

Graphical abstract: Constructing amidoxime-modified porous adsorbents with open architecture for cost-effective and efficient uranium extraction

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Article information


Submitted
14 Jan 2020
Accepted
10 Apr 2020
First published
14 Apr 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 4747-4752
Article type
Edge Article

Constructing amidoxime-modified porous adsorbents with open architecture for cost-effective and efficient uranium extraction

Z. Li, Q. Meng, Y. Yang, X. Zou, Y. Yuan and G. Zhu, Chem. Sci., 2020, 11, 4747
DOI: 10.1039/D0SC00249F

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