环境材料与生态化学研究发展中心知识库

Well-defined two-dimensional superparamagnetic clay/polyaniline/Fe₃O₄ nanocomposites were successfully prepared for dye adsorption based on montmorillonite and vermiculite via a one-pot method combining in-situ intercalation polymerization and coprecipitation technique. The results of XRD revealed that montmorillonite and vermiculite were well intercalated and even completely exfoliated by polyaniline and Fe₃O₄. Furthermore, the generated Fe₃O₄ nanoparticles with a diameter of about 10 nm and polyaniline were well confined to the surface of clay without the free aggregates. The as-prepared two-dimensional superparamagnetic nanocomposites could be served as a recycled adsorbent for the removal of dyes from aqueous solution by magnetic separation. The adsorption ratio toward 100 ppm of Brilliant green, Methylene blue, and Congo red reached 96.2%, 99.6% and 98.1%, respectively. In addition, the adsorption kinetics and the adsorption isotherm well fitted pseudo second-order kinetic model and Langmuir isotherm model, respectively. It suggested that the two-dimensional superparamagnetic nanocomposites exhibited excellent adsorption ratio to cationic dyes as well as anionic dyes.