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)

Table 10

Comparison of adsorption capacities of Cr(VI) on different adsorbents.

Adsorbent	Adsorption capacity (mg/g)	Adsorption efficiency (%)	Reference
CHBAC	35.82	97.65	Present work
TSCA	19.48	95.90	[23]
ACAP	18.78	96.9	[66]
RSS	15.47	97.80	[67]
ATSAC	21.75	98.00	[68]
PSAC	16.26	95.7	[69]