K₂CO₃-Activated Pomelo Peels as a High-Performance Adsorbent for Removal of Cu(II): Preparation, Characterization, and Adsorption Studies

Table 5

The comparison of absorption capacity for Cu(II) by PACs and other biomaterials.

Biomaterials	Adsorbent dose, g/ml	pH	qm, mg/g	Best fit isotherms model	References
Sacha inchi shell	0.1/50	6.00	9.699	Langmuir	[50]
Tomato waste	0.2/50	2–8	22.37	Langmuir	[51]
Beech wood	Unrecorded	4.6–5.0	11–14	Unrecorded	[52]
Lyophilized-bleached almond shell	0.2/50	6	28.7	Langmuir	[53]
Rice straw	0.1/1000	5	29.8	Langmuir	[54]
Lobster shell	0.2/100	2–6	71.4	Langmuir, Freundlich	[55]
Kenaf fiber	0.1/20	5	57.14	Langmuir	[18]
Hazelnut shell	1.0/100	5.0	200	Langmuir, Freundlich	[56]