Fig. 5From: Adsorption of Cadmium Ions from an Aqueous Solution on a Highly Stable Dopamine-Modified Magnetic Nano-Adsorbenta Effect of the Cd2+ concentration on the adsorption capacity, b Langmuir isotherm, c Freundlich isotherm, and d D-R isotherm for the adsorption of Cd2+ by Fe3O4@PDABack to article page