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. 2020 Sep 11;403:123909. doi: 10.1016/j.jhazmat.2020.123909

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Fig. 2 — (a) N₂ adsorption-desorption measurement of SNF-ferric oxide composite. (b) FTIR spectra of silk fibroin and silk fibroin-ferric oxide nanohybrid. (c) SEM image of silk fibroin-ferric oxide nanohybrid and the corresponding EDS mapping for C, O and Fe elements. (d) XPS spectra of SNF-ferric oxide nanohybrid.