title: Functionalized Porous Aromatic Framework for Efficient Uranium Adsorption from Aqueous Solutions.
abstract: 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-1and 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.
authors.affiliation: Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States.
authors.forename: Baiyan
authors.initials: B
authors.lastname: Li
authors.affiliation: Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States.
authors.forename: Qi
authors.initials: Q
authors.lastname: Sun
authors.affiliation: Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States.
authors.forename: Yiming
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, University of Chicago , 929 East 57th St., Chicago, Illinois 60637, United States.|Chemical Sciences Division, Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge, Tennessee 37831, United States.
authors.forename: Carter W
authors.identifier: http://orcid.org/0000-0002-1809-9577
authors.initials: CW
authors.lastname: Abney
authors.affiliation: Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States.
authors.forename: Briana
authors.initials: B
authors.lastname: Aguila
authors.affiliation: Department of Chemistry, University of Chicago , 929 East 57th St., Chicago, Illinois 60637, United States.
authors.forename: Wenbin
authors.identifier: http://orcid.org/0000-0001-7035-7759
authors.initials: W
authors.lastname: Lin
authors.affiliation: Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States.
authors.forename: Shengqian
authors.identifier: http://orcid.org/0000-0002-1897-7069
authors.initials: S
authors.lastname: Ma
keywords: amidoxime chelating group; porous aromatic framework; postsynthetic modification; radionuclide migration; uranium adsorption