Document Type : Original Article

Authors

• Mahboobeh Dehvari ¹
• Mohammad Taghi Ghaneian ¹
• Asghar Ebrahimi ¹
• Behzad Jamshidi ²
• Mahbooobeh Mootab ¹

¹ Environmental Sciences and Technology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

² Faculty Member of Public Health, Department of Environmental Health Engineering, Shahid Sadoughi University of Medical Sciences, Yazd, Iran

Abstract

Aims: The aim of this study was the evaluation of adsorption kinetics and equilibrium of reactive blue 19 dyes from textile synthetic wastewater by pomegranate seed powder. Materials and Methods: This study is an experimental research, which was performed in laboratory scale. In this study, the parameters such as adsorbent dose, pH and retention time, initial concentration of dye and agitation rate have been investigated. After washing and boiling of pomegranate seeds for 2 h, they dried, milled and finally pulverized by standard ASTM sieves (40-100 mesh). Maximum adsorption wave length (λ_max ) by spectrophotometer ultra violet/visible (model SP-3000 Plus) 592 nm was determined. The Langmuir, Freundlich and Temkin isotherm models and the pseudo-first-order and pseudo-second-order kinetic models were analyzed. Results: According to results, the removal efficiency with adsorbent dose, retention time and agitation rate has a direct relation. Maximum adsorption occurred in the first 60 min. The removal efficiency with initial concentration of dye and pH of solution has indirect relation. The Freundlich isotherm fits the experimental data better than the other isotherms. It was recognized that the adsorption followed by pseudo-second-order model (R² > 0.99). Conclusion: Based on the results, pomegranate seeds as a new natural sorbent can be used in removal of dye and other environmental pollutants with desirable absorption capacity.

Keywords

• Adsorption
• isotherms and kinetics
• pomegranate seeds
• reactive blue 19 dye
• textile industry