Adsorptive Removal of Hexavalent Chromium by Diphenylcarbazide-Grafted Macadamia Nutshell Powder

Figure 6

Effect of initial solution pH on the removal of Cr(VI) by MHP and MHPD adsorbents (conditions: initial Cr(VI) concentration 150 mg/L; dosage 2.5 g/L; and time 120 min).