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Silk fibroin/nylon-6 blend nanofilter matrix for copper removal from aqueous solution

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Abstract

Heavy metal pollution has become a serious problem for living organisms. In this study, silk fibroin (SF)/nylon-6 nanofiber matrices were formed by electrospinning and their surface was modified with calcium phosphate (CaP) crystals to increase the affinity of divalent heavy metals. The properties of matrices were evaluated as a filter matrix for copper adsorption from aqueous solution. Attenuated total reflectance fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS), X-ray photoelectron spectroscopy (XPS), and alizarin red staining method were used for characterization. Adsorption studies were performed by batch and continuous system. The various parameters regarding adsorption process such as pH of solution, surface area, initial copper concentration, and flow rate were optimized. Toxicity values were assessed before and after the Cu(II) adsorption studies. The resultant SF/nylon-6 nanofiber matrices indicate an excellent fibrous structure without beads (fiber diameter at 250 ± 50 nm) and modified successfully with CaP crystals. Adsorption results showed that the removal efficiency of copper could reach 32 % by continuous flow system  whereas 77 % by batch system. Acute toxicity bioassays using Vibrio fischeri showed that the toxicity decreased after continuous and batch flow systems. For desorption study, different concentrations of various desorption solutions were used and the percentage of Cu(II) desorption was determined as 11 %, approximately.

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Acknowledgments

This study was financially supported by TÜBİTAK (The Scientific and Technical Research Council of Turkey) under the Grant No. 111T671.

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Authors and Affiliations

  1. Nanotechnology and Nanomedicine Division, Department of Chemistry, Hacettepe University, Beytepe, 06800, Ankara, Turkey

    Eda Yalçın, Zeynep Karahaliloğlu, Murat Demirbilek, Cem Bayram & Necdet Sağlam

  2. Pharmaceutical and Medical Device Institution, Ministry of Health, 06520, Ankara, Turkey

    Eda Yalçın

  3. Graduate School of Natural and Applied Sciences, Eskisehir Osmangazi University, 26480, Eskisehir, Turkey

    Serap Gedikli

  4. Department of Biology, Faculty of Arts and Science, Eskisehir Osmangazi University, 26480, Eskisehir, Turkey

    Ahmet Çabuk

  5. Department of Biology, Aksaray University, Aksaray, Turkey

    Mesut Şam

  6. Biochemistry Division, Department of Chemistry, Hacettepe University, Beytepe, 06800, Ankara, Turkey

    Emir Baki Denkbaş

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  1. Eda Yalçın
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  9. Emir Baki Denkbaş
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Correspondence to Emir Baki Denkbaş.

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Yalçın, E., Gedikli, S., Çabuk, A. et al. Silk fibroin/nylon-6 blend nanofilter matrix for copper removal from aqueous solution. Clean Techn Environ Policy 17, 921–934 (2015). https://doi.org/10.1007/s10098-014-0845-1

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