Congo red dye adsoprtion study on Ni2O3/NaZSM-5 type materials

Abstract

In this work, were developed materials of the type Ni₂O₃/NaZSM-5 and evaluated in the adsorption of Congo red dye. Zeolite NaZSM-5 was obtained from commercial zeolite NH₄ZSM-5 through ion exchange and nickel(III) oxide was incorporated into NaZSM-5, in different proportion, by mechanosynthesis. The adsorbents were characterized using N₂ adsorption and desorption, X ray diffraction (XRD), scanning eléctron microscopy (SEM) and determined the pH of the point of zero charge (PZC). The results of congo red by adsorption in the liquid phase showed that the adsorbents containing nickel(III) oxide (10% Ni₂O₃/NaZSM-5 e 20% Ni₂O₃/NaZSM-5) showed adsorption efficiency 5 and 9% higher than NaZSM-5. Kinetic studies showed that the pseudo second order model exhibited the best fit with experimental data with R² valeus closer to unity. The study of reuse of adsorbents was evaluated and presented promising results.