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• W2016330488 abstract "A new type of adsorbent which is capable of selectively adsorbing lead(II) ions (Pb2+) was developed. The adsorbent was generated by reaction of sodium alginate with NB-9000B, a polyisocyanate type of prepolymer of polyurethane. The adsorbent was a hydrophilic and flexible alginate/polyurethane composite foam (ALG/PUCF) with the alginate chemically immobilized in the cell walls of the foam. Acid–base titration was used to quantify the concentration of carboxyl groups, which are present on the alginate molecules of the ALG/PUCF, functioning as the essential sites for binding Pb2+. For the optimized ALG/PUCF, the carboxyl was found to be 38.2 ± 1.2 μmol/g of dry weight. The capacity for adsorbing Pb2+ ions in 1.0 g of dry weight of the optimized ALG/PUCF was found to be 16.0 ± 2.1 μmol, indicating that ion exchange was the essential mechanism for adsorbing Pb2+ ions. The adsorption capacity was found to be highly sensitive to the pH of the sample solution; lower pH (<3) significantly decreased the adsorption. Competing ions such as Mg2+, Ca2+, and Cd2+ also caused a decrease in selectivity and capacity for Pb2+ adsorption, although the effect was less pronounced than the effect of pH. The ALG/PUCF is highly stable, flexible and easy to use. ALG/PUCF is also reusable after regeneration with ethylenediamine-N,N,N′,N′-tetraacetic acid, disodium salt (EDTA-2Na). Due to these features, this adsorbent may be highly useful for elimination of Pb2+ ions from contaminated water." @default.
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• W2016330488 date "2009-02-01" @default.
• W2016330488 modified "2023-10-12" @default.
• W2016330488 title "Selective elimination of lead(II) ions by alginate/polyurethane composite foams" @default.
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• W2016330488 doi "https://doi.org/10.1016/j.jhazmat.2008.05.093" @default.
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