Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H<sub>2</sub>SO<sub>4</sub>) as Activating Agent by Using Central Composite Design (CCD)

<div>The effects of (a) pH, (b) dose (g/L), and (c) contact time on Cr (VI) removal efficiency.</div>

Journal of Environmental and Public Health

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Figure 4

Figure 4: Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H<sub>2</sub>SO<sub>4</sub>) as Activating Agent by Using Central Composite Design (CCD) 

Figure 4 | Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H2SO4) as Activating Agent by Using Central Composite Design (CCD) 