Figure 3
From: Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

XRD spectra of OS-CS AC (before and after removal of Cr (VI)).
From: Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

XRD spectra of OS-CS AC (before and after removal of Cr (VI)).