Adsorption of the Malachite Green by Magnetic Clam Shell Powder

Magnetic clam shell powder (MCS) was prepared from river clam shell by crushing, calcining at 900 degrees C and Fe3O4 was loaded on it by chemical coprecipitation. The functional groups of the composites were characterized using Fourier transform infrared spectroscopy (FT-IR). Batch adsorption was conducted to study the effects of various parameters such as initial concentration, temperature, adsorbent dosage and other factors on adsorption. Through the study of adsorption isotherm model (Langmuir isotherm model, Freundlich isotherm model, Temkin isotherm model, Halsey isotherm model) , kinetic model (quasi first order kinetics, quasi second order kinetics, Elovich model) and adsorption mechanism (intraparticle diffusion and Boyd models) , it showed that the quasi-second order kinetic equation and Langmuir equation could describe the adsorption process well, and the intra particle diffusion, liquid film diffusion and chemical adsorption were important factors to control the reaction rate.