Table 2: Isotherm parameters for adsorption of Cd(II) onto selected adsorbents, RDP and ADP.

AdsorbentLangmuir modelFreundlich modelDubinin-Radushkevich (D-R) model

RDP6.020.0190.32–0.840.9631.490.2030.9990.750.140.955
ADP17.240.0320.22–0.760.9851.510.820.9971.040.140.900