Table 4: The kinetics constants for the adsorption of Cd(II) onto RDP and ADP, (initial concentration of Cd(II) = 50 mg /L).

AdsorbentsPseudo-first-order kinetics
Pseudo-second-order kinetics
, min−1 , g (mg min) −1

RDP3.45 × 10−30.7630.0180.999
ADP7.23 × 10−3
0.8290.0280.999