Adsorption of Cd2+ Ions from Aqueous Solution Using Biomasses of Theobroma cacao, Zea mays, Manihot esculenta, Dioscorea rotundata and Elaeis guineensis

In this work, the mechanisms of cadmium (Cd2+) adsorption on residual biomasses from husks yam (Dioscorea rotundata), cassava (Manihor esculenta), cocoa (Theobroma cacao), corn (Zea mays) and oil palm bagasse (Elaeis guineensis) were studied in order to evaluate effect temperature, adsorbent dose particle size a batch system. Isotherms kinetics determined adjusted different models. The biomaterials characterized using techniques Scanning Electron Microscopy (SEM) Energy-Dispersive X-ray Spectroscopy (EDS). Results reveal that possible Cd2+ bioadsorbents ion exchange complexation with -COOH -OH groups. From experimentation, it was found best conditions presented at 55 °C, 0.5 mm 0.03 g adsorbent. following biomass performance obtained terms capacities: husk (CH) > cob residues (CCR) peel (CP) (OPB) (YP), according Langmuir Dubinin- Radushkevich (D-R) equilibrium over YP OPB well described by Langmuir’s isothermal model, while for CH, CCR CP model fit experimental data Freundlich’s model. results D-R suggested process is controlled physisorption mechanism strong interactions among active sites ions. all systems pseudo-second values thermodynamic parameters established removal endothermic nature not spontaneous CP, exothermic, irreversible when OPB, CH CCR. suggest use YP, aqueous Cd2+.