Fig. 7: The high-resolution spectra of EW-BC before and after Cr(VI) removal.

The C 1 s (a), O 1 s (b), and N 1 s (c) high-resolution spectra of EW-BC before Cr(VI) removal and the C 1 s (d), O 1 s (e), and N 1 s (f) high-resolution spectra of EW-BC after Cr(VI) removal.