Competitive and Noncompetitive Batch Sorption Studies of Aqueous Cd(II) and Pb(II) Uptake onto Coffea canephora Husks, Cyperus papyrus Stems, and Musa spp. Peels

Table 4

The co-ionic effects on metal ions uptake efficiencies of biosorbents in competitive sorption studies.

Biosorbent	Ion sorbed	pH	Competing ions and removal efficiency (%)				Reference
			None	Pb	Cd	Cu
Aspergillus niger	Pb		3.81	—	2.87	1.83	[7]
	Cd	4.0	2.00	0.96	—	0.33
	Cu		2.09	1.05	1.44	—
	Cd		86.6	68.5	—	—
			None	Zn	Cd	Cu
Date palm waste	Cu		90	87.5	85	—	[26]
	Cd	6.0	57.5	58	—	55
	Zn		37.5	—	35.5	35
			None	Pb	Cu	Zn
Musa sapientum	Cu	6.0	86.8	86.8	—	87.4	[27]
	Zn		84.6	57.9	84.8	—
			None	Pb	Cd	—
Coffea canephora	Pb		98.1	—	82.4	—	This study
	Cd		82.9	18.8	—	—
Musa spp.	Pb	4.5	95.2	—	70.7	—
	Cd		30.6	16.7	—	—
Cyperus papyrus	Pb		98.1	—	43.1	—
	Cd		11.1	7.7	—	—