Figure 7

(a) pH study for adsorption of methyl orange (100 mg/L) and methyl red (100 mg/L) on Delonix regia biochar-sulfur (DRB-SO), (b) pH zero point charge (pHZPC) for D. regia biochar-sulfur oxide (pHZPC of DRB-SO).
(a) pH study for adsorption of methyl orange (100 mg/L) and methyl red (100 mg/L) on Delonix regia biochar-sulfur (DRB-SO), (b) pH zero point charge (pHZPC) for D. regia biochar-sulfur oxide (pHZPC of DRB-SO).