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

Journal Article · · Advanced Materials
ORCiD logo [1];  [1]; ORCiD logo [2];  [2];  [3]; ORCiD logo [4]
  1. Department of ChemistryUniversity of California, Berkeley Berkeley CA 94720 USA; Materials Sciences DivisionLawrence Berkeley National Laboratory Berkeley CA 94720 USA
  2. Department of ChemistryUniversity of California, Berkeley Berkeley CA 94720 USA
  3. Department of ChemistryUniversity of California, Berkeley Berkeley CA 94720 USA; Department of Chemical and Biomolecular EngineeringUniversity of California, Berkeley Berkeley CA 94720 USA
  4. Department of ChemistryUniversity of California, Berkeley Berkeley CA 94720 USA; Materials Sciences DivisionLawrence Berkeley National Laboratory Berkeley CA 94720 USA; Department of Chemical and Biomolecular EngineeringUniversity of California, Berkeley Berkeley CA 94720 USA

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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
DOE Contract Number:
AC02-05CH11231; SC0001015
OSTI ID:
1566392
Journal Information:
Advanced Materials, Vol. 31, Issue 18; ISSN 0935-9648
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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