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Branched Polymeric Media: Perchlorate-Selective Resins from Hyperbranched Polyethyleneimine

Chen, Dennis P. and Yu, Changjun and Chang, Ching-Yu and Wan, Yanjian and Frechet, Jean M. and Goddard, William A., III and Diallo, Mamadou S. (2012) Branched Polymeric Media: Perchlorate-Selective Resins from Hyperbranched Polyethyleneimine. Environmental Science and Technology, 46 (19). pp. 10718-10726. ISSN 0013-936X. doi:10.1021/es301418j.

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Perchlorate (ClO_4^–) is a persistent contaminant found in drinking groundwater sources in the United States. Ion exchange (IX) with selective and disposable resins based on cross-linked styrene divinylbenzene (STY-DVB) beads is currently the most commonly utilized process for removing low concentrations of ClO_4^– (10–100 ppb) from contaminated drinking water sources. However, due to the low exchange capacity of perchlorate-selective STY-DVB resins (0.5–0.8 eq/L), the overall cost becomes prohibitive when treating groundwater with higher concentration of ClO_4^– (e.g., 100–1000 ppb). In this article, we describe a new perchlorate-selective resin with high exchange capacity. This new resin was prepared by alkylation of branched polyethyleneimine (PEI) beads obtained from an inverse suspension polymerization process. Batch and column studies show that our new PEI resin with mixed hexyl/ethyl quaternary ammonium chloride exchange sites can selectively extract trace amounts of ClO_4^– from a makeup groundwater (to below detection limit) in the presence of competing ions. In addition, this resin has a strong-base exchange capacity of 1.4 eq/L, which is 1.75–2.33 times larger than those of commercial perchlorate-selective STY-DVB resins. The overall results of our studies suggest that branched PEI beads provide versatile and promising building blocks for the preparation of perchlorate-selective resins with high exchange capacity.

Item Type:Article
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Goddard, William A., III0000-0003-0097-5716
Diallo, Mamadou S.0000-0002-2571-1568
Additional Information:© 2012 American Chemical Society. Received: April 10, 2012. Revised: August 30, 2012. Accepted: September 5, 2012. Publication Date (Web): September 5, 2012. The authors declare the following competing financial interest(s): Prof. Mamadou S. Diallo is the co-founder of a start-up company (AquaNano, LLC). This company is scaling up and commercializing a new generation of high performance media using branched macromolecules as building blocks. This research was carried out at the California Institute of Technology and AquaNano, LLC. Selected materials characterization studies (FT-IR and SEM) were carried out at the Korea Advanced Institute of Science and Technology (KAIST). Funding for this research was provided by the U.S National Science Foundation (NSF) [CBET Award 0506951]. M. S. Diallo and D. P. Chen were supported by the KAIST EEWS Initiative (NT080607C0209721). W. A. Goddard III was supported partially by the KAIST World Class University (WCU) program (NRF-31-2008-000-10055).
Funding AgencyGrant Number
NSFCBET 0506951
KAIST EEWS InitiativeNT080607C0209721
KAIST World Class University (WCU)NRF-31-2008-000-10055
Issue or Number:19
Record Number:CaltechAUTHORS:20121127-100446072
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Official Citation:Branched Polymeric Media: Perchlorate-Selective Resins from Hyperbranched Polyethyleneimine Dennis P. Chen, Changjun Yu, Ching-Yu Chang, Yanjian Wan, Jean M. J. Frechet, William A. Goddard, III, and Mamadou S. Diallo Environmental Science & Technology 2012 46 (19), 10718-10726
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35666
Deposited By: Ruth Sustaita
Deposited On:27 Nov 2012 18:39
Last Modified:09 Nov 2021 23:16

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