Evaluation of the efficiency adsorption process with Zeolite@ in the removal of methylene blue dye from aqueous solutions

Negar  Einollahzadeh; Mehdi  Vosoughi

doi:10.18502/tbj.v20i4.7818

Negar Einollahzadeh B.S. of Environmental Health Engineering, Students Research Committee, Ardabil University of Medical Sciences, Ardabil, Iran.
Mehdi Vosoughi Assistant professor, Department of Environmental Health Engineering, School of Public Health, Ardabil University of Medical Sciences, Ardabil, Iran

DOI: https://doi.org/10.18502/tbj.v20i4.7818

Keywords: Methylene blue, Adsorption, Zeolite@ZnO, Zeolite

Abstract

Introduction: Dyes are materials with a complex structure that enter the environment from textile process such as dyeing and washing. The aim of this study was to investigate the efficiency of the absorption process along with adsorption using by Zeolite @ ZnO in the removing methylene blue dye from textile wastewater.

Methods: The structure and morphology of nanoparticles were examined using XRF, FTIR and FESEM techniques. Dye concentrations were determined using a spectrophotometer at 664 nm. In this study, the variables of reaction time, solution pH, adsorbent amount and dye concentration were evaluated. To determine the isotherm and adsorption kinetics, two isotherm models of Langmuir and Freundlich and two kinetics models pseudo-first order pseudo-second order were used.

Results: We found that optimal conditions were concentration of 50 mg/l, adsorbent dose of 1 g/l, pH of 11 and a reaction time of 60 minutes. The removal efficiency under optimal conditions for methylene blue was 95.8%.

Conclusion: The results of the isotherm and adsorption kinetics study for methylene blue showed that the adsorption process follows the Langmuir isotherm and quasi-quadratic kinetics. The maximum adsorption capacity of the adsorbent was determined 384 mg/g using the Langmuir model.