Version 2 2017-04-10, 14:18Version 2 2017-04-10, 14:18
Version 1 2017-03-31, 19:14Version 1 2017-03-31, 19:14
journal contribution
posted on 2017-03-28, 00:00authored byBaiyan Li, Qi Sun, Yiming Zhang, Carter W. Abney, Briana Aguila, Wenbin Lin, Shengqian Ma
We demonstrate the
successful functionalization of a porous aromatic framework for uranium
extraction from water as exemplified by grafting PAF-1 with the uranyl
chelating amidoxime group. The resultant amidoxime-functionalized
PAF-1 (PAF-1-CH2AO) exhibits a high uranium uptake capacity
of over 300 mg g–1 and effectively reduces the uranyl
concentration from 4.1 ppm to less than 1.0 ppb in aqueous solutions
within 90 min, well below the acceptable limit of 30 ppb set by the
US Environmental Protection Agency. The local coordination environment
of uranium in PAF-1-CH2AO is revealed by X-ray absorption
fine structure spectroscopic studies, which suggest the cooperative
binding between UO22+ and adjacent amidoxime
species.