حذف رنگهای Reactive Red 120 و Direct Red 81 از محلول های آبی توسط پامیس

Title

Removal of Reactive Red 120 and Direct Red 81 dyes from aqueous solutions by Pumice

English Abstract

Dyes are the main pollutants existing in wastewater of textile industries. Dyes are produced naturally or artificially and can cause fabrics to take different colors. The main objective of this work was to investigate adsorption of Reactive Red 120 (RR 120) and Direct Red 81 (DR 81) dyes by pumice. This fundamental-practical study was conducted in labscale batch system. Chemical structure and composition of Pumice was determined by X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM) and electronic microscope. The effects of contact time and initial solution pH on adsorption process were also evaluated. The Freundlich and Langmuir isotherms were used to describe adsorption equilibrium. The results of adsorption isotherm experiments show that the removal of RR120 and DR81 dyes follow Langmuir (R2>0.964) and Freundlich (R2>0.932) isotherm models. It was found that the affinity coefficients, Kf, for DR81 and RR120 dyes were 10.56 and 2.32 respectively, indicating higher adhesion of pumice to DR81 than RR120. In general, the results of the study showed that pumice can be used as a cheap and effective adsorbent for removal of dye from textile industrial effluents.

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