Functionalized Porous Aromatic Frameworks as High-Performance Adsorbents for the Rapid Removal of Boric Acid from Water.

Autor: Kamcev J; Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Taylor MK; Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA., Shin DM; Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA., Jarenwattananon NN; Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA., Colwell KA; Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.; Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA., Long JR; Department of Chemistry, University of California, Berkeley, Berkeley, CA, 94720, USA.; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.; Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, CA, 94720, USA.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2019 May; Vol. 31 (18), pp. e1808027. Date of Electronic Publication: 2019 Mar 18.
DOI: 10.1002/adma.201808027
Abstrakt: This study demonstrates that functionalized, highly porous polymers are promising for the adsorptive capture of boric acid, a neutral contaminant that is difficult to remove from seawater using conventional reverse osmosis membranes. Appending N-methyl-d-glucamine (NMDG) to the pore walls of high-surface-area porous aromatic frameworks (PAFs) yields the adsorbents PAF-1-NMDG and P2-NMDG in a simple two-step synthesis. The boron-selective PAFs demonstrate adsorption capacities that are up to 70% higher than those of a commercial boron-selective resin, Amberlite IRA743, and markedly faster adsorption rates, owing to their higher NMDG loadings and greater porosities relative to the resin. Remarkably, PAF-1-NMDG is able to reduce the boron concentration in synthetic seawater from 2.91 to <0.5 ppm in less than 3 min at an adsorbent loading of only 0.3 mg mL -1 . The boron adsorption rate constants of both frameworks, determined via a pseudo-second-order rate model, represent the highest values reported in the literature-in most cases orders of magnitude higher than those of other boron-selective adsorbents. The frameworks can also be readily regenerated via mild acid/base treatment and maintain constant boron adsorption capacities for at least 10 regeneration cycles. These results highlight the numerous advantages of PAFs over traditional porous polymers in water treatment applications.
(© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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