title: Extraction of Lanthanide and Actinide Ions from Aqueous Mixtures Using a Carboxylic Acid-Functionalized Porous Aromatic Framework.
abstract: Porous aromatic frameworks (PAFs) incorporating a high concentration of acid functional groups possess characteristics that are promising for use in separating lanthanide and actinide metal ions, as required in the treatment of radioactive waste. These materials have been shown to be indefinitely stable to concentrated acids and bases, potentially allowing for multiple adsorption/stripping cycles. Additionally, the PAFs combine exceptional features from MOFs and inorganic/activated carbons giving rise to tunable pore surfaces and maximum chemical stability. Herein, we present a study of the adsorption of selected metal ions, Sr(2+), Fe(3+), Nd(3+), and Am(3+), from aqueous solutions employing a carbon-based porous aromatic framework, BPP-7 (Berkeley Porous Polymer-7). This material displays high metal loading capacities together with excellent adsorption selectivity for neodymium over strontium based on Langmuir adsorption isotherms and ideal adsorbed solution theory (IAST) calculations. Based in part upon X-ray absorption spectroscopy studies, the stronger adsorption of neodymium is attributed to multiple metal ion and binding site interactions resulting from the densely functionalized and highly interpenetrated structure of BPP-7. Recyclability and combustibility experiments demonstrate that multiple adsorption/stripping cycles can be completed with minimal degradation of the polymer adsorption capacity.
authors.affiliation: Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States; Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
authors.forename: Selvan
authors.initials: S
authors.lastname: Demir
authors.affiliation: Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States; Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
authors.forename: Nicholas K
authors.initials: NK
authors.lastname: Brune
authors.affiliation: Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of California , Berkeley, California 94720, United States.
authors.forename: Jeffrey F
authors.initials: JF
authors.lastname: Van Humbeck
authors.affiliation: Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of California , Berkeley, California 94720, United States.
authors.forename: Jarad A
authors.initials: JA
authors.lastname: Mason
authors.affiliation: Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States; Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, Moscow 11991, Russia.
authors.forename: Tatiana V
authors.initials: TV
authors.lastname: Plakhova
authors.affiliation: Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States; Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
authors.forename: Shuao
authors.initials: S
authors.lastname: Wang
authors.affiliation: Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States; Radiochemistry Department, China Institute of Atomic Energy, Beijing 102413, China.
authors.forename: Guoxin
authors.initials: G
authors.lastname: Tian
authors.affiliation: Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Stefan G
authors.initials: SG
authors.lastname: Minasian
authors.affiliation: Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Tolek
authors.initials: T
authors.lastname: Tyliszczak
authors.affiliation: Actinide Chemistry Group, Energy and Environment Science Division, Quantum Beam Science Center, Japan Atomic Energy Agency , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Yaita
authors.affiliation: Actinide Chemistry Group, Energy and Environment Science Division, Quantum Beam Science Center, Japan Atomic Energy Agency , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
authors.forename: Tohru
authors.initials: T
authors.lastname: Kobayashi
authors.affiliation: Chemistry Department, Lomonosov Moscow State University , Leninskie Gory, Moscow 11991, Russia.
authors.forename: Stepan N
authors.initials: SN
authors.lastname: Kalmykov
authors.affiliation: Actinide Chemistry Group, Energy and Environment Science Division, Quantum Beam Science Center, Japan Atomic Energy Agency , 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Shiwaku
authors.affiliation: Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: David K
authors.initials: DK
authors.lastname: Shuh
authors.affiliation: Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States; Department of Chemistry and Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, United States; Chemical Sciences Division, Materials Sciences Division, and Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Long