Comparing efficiency natural pumice and modified with iron in removal Reactive Black5 dye

Industrial effluents، especially textile industry are one of the major sources from environmental pollution. The purpose of this study removal Reactive Black5 (RB5) dye with using natural pumice and modified with iron and is determined equilibrium constant. Futures and morphological characteristics of natural pumice and modified with iron was determined via XRay diffraction (XRD) and SEM techniques. In this study، the optimum pH was 3. The results showed that the adsorption of RB5 dye with natural pumice and modified with iron were fitted Freundlich (R2>0. 75) and Langmuir (R2>0. 98) isotherm equation. Langmuir models the maximum dye adsorption capacity using natural pumice and modified with iron 1. 18 and 0. 003 mg/g of adsorbent was obtained. Overall results of this study showed that efficiency removal RB5 with pumice modified with iron in comparison with natural pumice is lower and can be from natural pumice as an inexpensive and effective adsorbent to remove azo dyes from textile wastewater used.