Abstract
The feasibility of employing a porous polyurethane–keratin hybrid membrane for the removal of hexavalent chromium was investigated. Keratin was extracted from chicken feathers and incorporated onto a synthetic polyurethane polymer to synthesize a hybrid membrane. Keratin supply active sites to bioadsorb Cr(VI) and polyurethane play an important role as the support to protein. Also, polyurethane–keratin biofiber membranes were synthesized. Biofibers obtained from chicken feathers were modified to activate their surface. The effective pore in membranes is less than 50 nm, which places these materials in the mesopore range. Scanning electron microscopy (SEM) was used to study the morphology of membranes, and mechanical dynamical analysis (DMA) was used to evaluate the viscoelastic properties. NH, C=O, S–S and C–S were determined via Fourier-transform infrared (FTIR) analysis as functional groups of keratin, which participate in the linking sorption of hexavalent chromium. Adsorption of Cr(VI) was carried out in a filtering system at low contact time in continuous flux; the maximum removal reached was 38% at neutral pH of chromium solution. Results indicate that the isoelectric point of keratin is relevant in the adsorption process. pH of keratin solution above the isoelectric point brings about higher adsorption of heavy metals, whereas lower pH causes minor adsorptions, due to the functional groups’ ion charges. Based on the results, keratin extracted from feathers is a natural biosorbent that can be incorporated onto synthetic polymers to develop novel membranes and improve its applications in the heavy metal separation process.
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Acknowledgments
The authors are grateful to Dr. G. Hernández-Padron for assistance in IR measurements, Miss Alicia del Real for assistance in SEM, and Dr. Rosalba Fuentes for assistance in BET. Ana Laura Martinez-Hernandez acknowledges the financial support of LOREAL-Mexico under the program “For Women in Science” and DGEST Mexico.
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Saucedo-Rivalcoba, V., Martínez-Hernández, A.L., Martínez-Barrera, G. et al. Removal of Hexavalent Chromium from Water by Polyurethane–Keratin Hybrid Membranes. Water Air Soil Pollut 218, 557–571 (2011). https://doi.org/10.1007/s11270-010-0668-6
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DOI: https://doi.org/10.1007/s11270-010-0668-6