Table 3: The kinetics constants for the adsorption of Cu(II) onto RDP and ADP, (initial concentration of Cu(II) = 50 mg/L).

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

RDP4.86 × 10−30.9230.0970.998
ADP0.017
0.7780.1310.999