Synthesis and application of nano-hematite on the removal of carcinogenic textile remazol red dye from aqueous solution

Abstract

Four nano-hematite adsorbents (α-Fe2 O3:Fe-P-T, Fe-W-3w, Fe-W-3d, Fe-A-3) were prepared via precipitation and/or dispersion–precipitation methods. The prepared adsorbents were characterized by X-ray diffraction, Fourier transforms infrared, high-resolution transmission electron microscopy and specific surface area analysis. These newly prepared adsorbents were applied for the removal of Remazol Red (RB-133) dye from aqueous solutions. Fe-W-3w adsorbent showed superior dye removal efficiency (100%), which may be attributed to its small crystal size and high surface area. Pseudo-second order and Langmuir equations describe perfectly the adsorption kinetics and isotherms for the investigated system. The factors affecting Remazol Red (RB-133) adsorption mechanism are discussed.