This study was conducted to investigate the best absorbent for cadmium (Cd) present in aqueous solutions.
Among the selected absorbents (n = 22), peanut husk biochar (PHB) was the best absorbent for Cd
and its adsorption reached to equilibrium within 12 h. In this study, the optimum conditions observed
for Cd adsorption were pH 5.0, an initial Cd concentration of 200 mg L−1, a PHB dosage of 40 g L−1, and
room temperature. The Cd removal efficiency of the tested biochar reached to 99.9% at these optimum
conditions. EDX analysis confirmed that Cd was adsorbed onto PHB more than onto PHs. It is concluded
that PHB can be used as a good remediating material for removal of Cd from contaminated environmental
matrixes.