Research Article

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

Figure 10

IR normalized spectra of PU-keratin membranes before removal process: (a) with MDI, (A) MPKAl, (B) MPKAc, (C) MPKN, and (D) MPH. (b) with TDI, (A) TPKAc, (B) TPKN, and (C) TPH.
892547.fig.0010a
(a)
892547.fig.0010b
(b)