Branched polymeric media: Perchlorate-selective resins from hyperbranched polyethyleneimine
AuthorsChen, Dennis P.
Goddard, William A.
Diallo, Mamadou S.
MetadataShow full item record
AbstractPerchlorate (ClO4 -) 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 ClO4 - (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 ClO4 - (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 ClO4 - 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. © 2012 American Chemical Society.
SponsorsThis 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).
PublisherAmerican Chemical Society (ACS)
- Branched polymeric media: boron-chelating resins from hyperbranched polyethylenimine.
- Authors: Mishra H, Yu C, Chen DP, Goddard WA 3rd, Dalleska NF, Hoffmann MR, Diallo MS
- Issue date: 2012 Aug 21
- Bioregeneration of perchlorate-laden gel-type anion-exchange resin in a fluidized bed reactor.
- Authors: Venkatesan AK, Sharbatmaleki M, Batista JR
- Issue date: 2010 May 15
- Sorption and desorption of perchlorate and U(VI) by strong-base anion-exchange resins.
- Authors: Gu B, Ku YK, Brown GM
- Issue date: 2005 Feb 1
- Dendritic anion hosts: perchlorate uptake by G5-NH2 poly(propyleneimine) dendrimer in water and model electrolyte solutions.
- Authors: Diallo MS, Falconer K, Johnson JH Jr, Goddard WA 3rd
- Issue date: 2007 Sep 15
- Treatment of perchlorate-contaminated groundwater using highly selective, regenerable ion-exchange technologies.
- Authors: Gu B, Brown GM, Chiang CC
- Issue date: 2007 Sep 1