Research Article
Polyurethane-Keratin Membranes: Structural Changes by Isocyanate and pH, and the Repercussion on Cr(VI) Removal
Table 2
Maximum values of Cr(VI) removal percentages through filtration process with PU-keratin membranes as function of pH.
| | Type of membrane | pH 5.7 | pH 2.5 | pH 1.5 | | Maximum value of Cr(VI) removal percentage | Time of removal (min) | Maximum value of Cr(VI) removal percentage | Time of removal (min) | Maximum value of Cr(VI) removal percentage | Time of removal (min) |
| | MPH | 0.81 | 90 | 6.44 | 240 | 25.24 | 90 | | MPKN | 1.96 | 270 | 11.54 | 270 | 29.22 | 240 | | MPKAc | 2.79 | 60 | 22.21 | 30 | 41.06 | 270 | | MPKAl | 3.75 | 30 | 8.07 | 270 | 57.91 | 240 | | TPH | 1.53 | 90 | 14.28 | 270 | 37.14 | 120 | | TPKN | 4.19 | 30 | 13.06 | 30 | 38.16 | 180 | | TPKAc | 8.14 | 90 | 5.77 | 270 | 26.47 | 60 |
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