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

Table 2

Isotherm parameters for adsorption of Cd(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	6.02	0.019	0.32–0.84	0.963	1.49	0.203	0.999	0.75	0.14	0.955
ADP	17.24	0.032	0.22–0.76	0.985	1.51	0.82	0.997	1.04	0.14	0.900