Fabrication of Fe3O4@Polypyrrole@Sulfamic Acid Composite for Efficient Adsorption of Four Cationic Dyes in Aqueous Solution

Abstract

With the continuous development of industry, the issue of industrial wastewater emissions is increasing. Adsorption, as an effective means possessing the features of no pollution, high efficiency, and easy operation, has become one of the effective methods to treat industrial wastewater. Fe₃O₄@polypyrrole@sulfamic acid (Fe₃O₄@PPy@SA) composite is successfully prepare by hydrothermal method, in situ polymerization, and modification. Its adsorption behaviors of the composite on MG, MB, CV, and RhB are investigated by UV–Vis, and the impacts of temperature, dye concentration, and the contact time between the composite and the dyes on the adsorption efficiency are researched. The adsorption kinetics and adsorption isotherms exhibit that the adsorption of these four dyes is more in accordance with pseudo-second-order kinetic model and Langmuir adsorption isotherm model, the diffusion behaviors are affected through the combined effect of intraparticle diffusion and Boyd membrane diffusion, and the thermodynamic studies display that all these adsorption behaviors are spontaneous heat absorption behaviors. The prepared Fe₃O₄@PPy@SA is an efficient adsorbent in the field of applications.