Research Article

Polyurethane-Keratin Membranes: Structural Changes by Isocyanate and pH, and the Repercussion on Cr(VI) Removal

Figure 3

SEM images of PU-keratin membranes; ((a)–(d)) with TDI; ((e)–(h)) with MDI.
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(a) TPH  
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(b) TPKN
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(c) TPKAc
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(d) TPKAl
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(e) MPH
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(f) MPKN
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(g) MPKAc
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(h) MPKAl