Novel Adsorbent from Iron Ore Concentration Tailings for Toxic Cationic Dye Removal from Water

摘要

A novel adsorbent (FB-mZVI) was prepared, using tailings from iron ore concentration plants, fly ash and bentonite, to remove crystal violet (CV) and methylene blue (MB) from polluted water. The adsorbent was prepared as cylindrical-shape pellets to easily separate it from the water after the adsorption process. The statistical orthogonal method was used to evaluate the factors determining the synthesis of FB-mZVI. Batch experiments revealed that the optimum mass ratio of fly ash, bentonite, iron ore tailings and palm kernel shell was 2:2:1:1. And in the synthesis of FB-mZVI adsorbent, the optimum reaction temperature was 800 ℃, the reaction time was 10 min and the heating rate was 10 ℃/min. SEM Characterization revealed that the adsorbent was highly porous and constituted by Fe° particles finely dispersed on an aluminosilicate matrix. The adsorbent showed to have a superior adsorption capacity for CV and MB when compared to other conventional adsorbents. The adsorption kinetics and isotherms of CV and MB on FB-mZVI adsorbents could be expressed by the pseudo-second-order model and Langmuir isotherm.