Table 1: Isotherm parameters for adsorption of Cu(II) onto selected adsorbents, RDP and ADP.

AdsorbentLangmuir modelFreundlich modelDubinin-Radushkevich (D-R) model

RDP7.400.1030.08–0.490.9901.190.900.9911.100.190.877
ADP33.440.0450.17–0.690.9701.861.500.9991.980.200.900