Branched Polymeric Media: Boron-Chelating Resins from Hyperbranched Polyethylenimine

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Extraction of boron from aqueous solutions using selective resins is important in a variety of applications including desalination, ultrapure water production, and nuclear power generation. Today's commercial boron-selective resins are exclusively prepared by functionalization of styrene-divinylbenzene (STY-DVB) beads with N-methylglucamine to produce resins with boron-chelating groups. However, such boron-selective resins have a limited binding capacity with a maximum free base content of 0.7 eq/L, which corresponds to a sorption capacity of 1.16 +/- 0.03 mMol/g in aqueous solutions with equilibrium boron concentration of similar to 70 mM. In this article, we describe the synthesis and characterization of a new resin that can selectively extract boron from aqueous solutions. We show that branched polyethylenimine (PEI) beads obtained from an inverse suspension process can be reacted with glucono-1,5-D-lactone to afford a resin consisting of spherical beads with high density of boron-chelating groups. This resin has a sorption capacity of 1.93 +/- 0.04 mMol/g in aqueous solution with equilibrium boron concentration of similar to 70 mM, which is 66% percent larger than that of standard commercial STY-DVB resins. Our new boron-selective resin also shows excellent regeneration efficiency using a standard acid wash with a 1.0 M HCl solution followed by neutralization with a 0.1 M NaOH solution.
Publisher
AMER CHEMICAL SOC
Issue Date
2012-08
Language
English
Article Type
Article
Keywords

BORIC-ACID; REMOVAL; EXTRACTION

Citation

ENVIRONMENTAL SCIENCE & TECHNOLOGY, v.46, no.16, pp.8998 - 9004

ISSN
0013-936X
DOI
10.1021/es301518x
URI
http://hdl.handle.net/10203/103071
Appears in Collection
EEW-Journal Papers(저널논문)
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