Abstract
The aim of this study is to investigate the use of keratin colloidal solution, which was obtained from wool, for the removal of Pb(II) from water. The addition of keratin colloidal solution (15 g L−1, 0.30 mL) to a Pb(II) solution (1.0 mM, 0.90 mL, pH 5.0) resulted in the formation and precipitation of a Pb–keratin aggregate. Measurement of the Pb(II) and protein concentrations in the supernatant solution revealed that 88 and 99 % of the Pb(II) and keratin protein were removed from the solution, respectively. The maximum Pb(II) uptake capacity of keratin in the colloidal solution was 43.3 mg g−1. In addition, the Pb–keratin aggregate was easily decomposed via the addition of nitric acid, which enabled the recovery of Pb(II). However, aggregation did not occur in solutions with Pb(II) concentrations below 0.10 mM. Therefore, we used a keratin colloidal solution encapsulated in a dialysis cellulose tube to remove Pb(II) from 0.10 mM solutions, which enabled the removal of 95 % of the Pb(II). From these results, we conclude that keratin colloidal solution is useful for the treatment of water polluted with Pb(II).
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Acknowledgments
This work was supported by Shinshu University Satellite Venture Business Laboratory (SVBL). We wish to thank Ms. Keiko Kakegawa (SVBL) for her generous SEM measurement and Ms. Etsuko Adachi (Shinshu University) for her support on the measurements of the particle size and the zeta voltage for the keratin colloidal solution.
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Sekimoto, Y., Okiharu, T., Nakajima, H. et al. Removal of Pb(II) from water using keratin colloidal solution obtained from wool. Environ Sci Pollut Res 20, 6531–6538 (2013). https://doi.org/10.1007/s11356-013-1727-5
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DOI: https://doi.org/10.1007/s11356-013-1727-5