Activated and Nonactivated Date Pits Adsorbents for the Removal of Copper(II) and Cadmium(II) from Aqueous Solutions

Table 1

Isotherm parameters for adsorption of Cu(II) onto selected adsorbents, RDP and ADP.

Adsorbent	Langmuir model				Freundlich model			Dubinin-Radushkevich (D-R) model
	𝑄𝑚	𝐾𝐿	𝑅𝐿	𝑅^2	𝑛	𝐾𝑓	𝑅^2	𝑋𝑚	𝜆(10)^7	𝑅^2
RDP	7.40	0.103	0.08–0.49	0.990	1.19	0.90	0.991	1.10	0.19	0.877
ADP	33.44	0.045	0.17–0.69	0.970	1.86	1.50	0.999	1.98	0.20	0.900