Polyurethane-Keratin Membranes: Structural Changes by Isocyanate and pH, and the Repercussion on Cr(VI) Removal
Figure 11
IR normalized spectra of membranes after the removal process; (a) for MPKAl membranes: (A) before removal process, (B) pH 5.7, (C) pH 2.5, and (D) pH 1.5. (b) for TPKAc membranes: (A) before removal process, (B) at pH 5.7, (C) at pH 2.5, and (D) at pH 1.5.
