Journal: JACS Au

Article Title: Aqueous Carbon Capture Using Guanidinium-Functionalized Hollow Fiber Sorbent Contactors

doi: 10.1021/jacsau.5c01639

Figure Lengend Snippet: HCO 3 – -selective ligand selection and polymer synthesis. ( a ) DFT models calculated binding energies of several candidate ligands, modeled in their protonated states and interacting with bicarbonate as ion–pair complexes. ( b ) Reaction scheme for the polymerization and postpolymerization modification of the PGA·Br polymer. ( c ) Solid-state 13 C NMR spectrum with relevant integrations and peaks labeled in reference to the polymer in figure ( b ). ( d ) Gel permeation chromatography (GPC) data plotted as a function of dRI against retention time. The M W was identified at 8730 g/mol, M n at 5970 g/mol, and D̵ = 1.5.

Article Snippet: For comparison, the FTIR spectra of as-received Arkema PVDF and neat PGA·Br polymer are included in b.

Techniques: Selection, Polymer, Binding Assay, Modification, Labeling, GPC Assay

Journal: JACS Au

Article Title: Aqueous Carbon Capture Using Guanidinium-Functionalized Hollow Fiber Sorbent Contactors

doi: 10.1021/jacsau.5c01639

Figure Lengend Snippet: HCO 3 – capture using a PGA polymer. ( a ) Immediate formation of a white precipitate upon addition of PGA·Br (100 μL of a 50 mg mL –1 solution) into 3 mL of 0.1 M NaHCO 3 , indicating rapid ion exchange and generation of insoluble PGA·HCO 3 . ( b ) HCO 3 – ion adsorption capacity of aqueous PGA polymer solution (solution concentration: 50 mg PGA dissolved in one mL of water). ( c ) Time-dependent depletion of HCO 3 – concentration following polymer addition. ( d ) Proposed ion-exchange mechanisms, where HCO 3 – binds either to a single guanidinium unit or as a dimer species.

Article Snippet: For comparison, the FTIR spectra of as-received Arkema PVDF and neat PGA·Br polymer are included in b.

Techniques: Polymer, Adsorption, Concentration Assay

Journal: JACS Au

Article Title: Aqueous Carbon Capture Using Guanidinium-Functionalized Hollow Fiber Sorbent Contactors

doi: 10.1021/jacsau.5c01639

Figure Lengend Snippet: Surface functionalization of PVDF hollow fiber using PGA·Br polymer. ( a ) Schematic showing the simplified functionalization steps to generate the PGA–PVDF fiber contactors. ( b ) FTIR spectra for as-received PVDF, as-synthesized PGA, and the PGA–PVDF functionalized fibers after day 1 and day 7 of dialysis against DI water. ( c ) XPS spectrum for the PGA–PVDF functionalized contactor shows a decrease in fluorine (F) atoms and a large increase in oxygen (O) and nitrogen (N), which suggests that the addition of the PGA·Br to the PVDF surface was successful. ( d ) Images of module construction using 20 PGA–PVDF hollow fibers. (1) Coils of PGA–PVDF fibers from the scaling process, which generated 20 functionalized fibers (14″ length). (2) Loose hollow fiber contactors trimmed and aligned. (3) PGA–PVDF contactors were drawn through a custom-made module with cured epoxy to create a seal. (4) Fully assembled custom-made module containing PGA–PVDF hollow fiber contactors.

Article Snippet: For comparison, the FTIR spectra of as-received Arkema PVDF and neat PGA·Br polymer are included in b.

Techniques: Polymer, Synthesized, Generated