Figure 2
From: Removal of Cr(VI) by biochar derived via co-pyrolysis of oily sludge and corn stalks

The influence of OS-CS AC dosages on Cr(VI) and Cr(Total) removal (a), The influence of the initial concentration of Cr(VI) on the removal of Cr (VI) and Cr (Total) (b),The influence of removal time on Cr(VI) and Cr(Total) removal (c),The influence of removal temperature on Cr(VI) and Cr(Total) removal (d).