Removal of crystal violet from aqueous solution by adsorption onto polyvinyl chloride magnetic nanocomposite (PVC-Fe3O4)

Iron oxides nanoparticles play a major role in many areas of chemistry, physics and materials science. Fe3O4 (magnetite) is one of the important magnetic nanoparticle. There are many various ways to prepare Fe3O4 nanoparticles, which have been reported in other papers. Furthermore, the presence of magnetic iron oxide (Fe3O4) leads to chemical stability, low toxicity, and excellent re-cyclability of adsorbent and these have caused to use this method widely for removal of toxic ions and organic contaminants from water and wastewater [1,2]. The crystal violet (CV) is toxic and may be absorbed through the skin causing irritation and is harmful byinhalation and ingestion. In extreme cases, can lead to kidney failure, severe eye irritation leading to permanent blindness and cancer [3,4]. Therefore, removal of this dye from water and wastewater is of great importance. The present work deals with the development of a novel method for the removal of crystal violet dye from aqueous solution by using Polyvinyle Chloride(PVC)-Fe3O4 nanocomposite. In this study, Polyvinyl Chloride-Fe3O4 magnetic nanocomposite were prepared by a Co-precipitation method and characterized by XRD, FT-IR and SEM. In this study, we studied how the key operational parameters: pH, contact time, dye concentration, dose of adsorbent and temperature could affect the adsorption performance for the removal of Crystal violet. Then, adsorption kinetics and Thermodynamic parameters of adsorption, ∆H0, and ∆S0 were calculated. Results were analyzed by the Freundlich and Langmuir equation. The experimental data fitted well with the Langmuir model with a maximum adsorption capacity of 416.66 mg/g. Pseudo-first and pseudo-second-order kinetics models were tested with the experimental data, and pseudo-second-order kinetics was the best for the adsorption of CV by PVC-Fe3O4.