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

Table 4

The kinetics constants for the adsorption of Cd(II) onto RDP and ADP, (initial concentration of Cd(II) = 50 mg /L).

Adsorbents	Pseudo-first-order kinetics		Pseudo-second-order kinetics
	𝑘1, min^−1	𝑅^2	𝑘2, g (mg min)^−1	𝑅^2
RDP	3.45 × 10^−3	0.763	0.018	0.999
ADP	7.23 × 10^−3	0.829	0.028	0.999