Fig. 6
The removal efficiencies of a copper, b iron, c nickel, d zinc, in single metal solutions and e copper f iron, g nickel and h zinc in mixed metal solution by biochar samples
Fig. 6 | Sustainable Environment Research
The removal efficiencies of a copper, b iron, c nickel, d zinc, in single metal solutions and e copper f iron, g nickel and h zinc in mixed metal solution by biochar samples