Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 69: Poster Wednesday: Organic Molecules on Inorganic Surfaces
O 69.13: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B2
Hybrid Zipper-Like Biopolymer Sorbents with Tunable Anion Sorption Properties — •Inimfon Udoetok1, Lee Wilson1, and John Headley2 — 1Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan, S7N 5C9 — 2Water Science and Technology Directorate, Environment and Climate Change Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, S7N 3H5
Quaternary composite (CGCFe) and ternary composite (CCFe) materials with variable morphology were prepared from carboxymethyl cellulose (CMC), chitosan, glutaraldehyde as the cross-linker, while iron III species acted as Lewis acid sites to impart unique anion binding properties. Characterization results provided evidence of cross-linking between the amine groups of chitosan and glutaraldehyde, variable iron doping and morphology for the composites. Equilibrium uptake results indicate that CGCFe surpassed the sorption capacity of CCFe, where greater uptake was noted at lower temperature. The monolayer sorption capacity of CGCFe for 2-naphthoxy acetic acid (S6) was 263 mg/g and 484 mg/g at alkaline and acidic pH conditions, respectively, with limited discrimination of OSPW naphthenate components, according to variable DBE or molecular weight range. Regeneration studies showed that CGCFe retained 95% of its sorption capacity after 5 cycles through a saline responsive zipper-like structural transition. This study provides insight on the role of Fe (III) species, cross-linking, and biopolymer structure that relate to anion binding properties in aqueous solution.