Evaluation of the Efficiency Adsorption Process with Zeolite@ in the Removal of Methylene Blue Dye from Aqueous Solutions

Introduction: Dyes are materials with a complex structure that enter the environment from textile processes such as dyeing and washing. The aim of this study was to investigate the efficiency of the absorption process using Zeolite @ ZnO in 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 ,and pseudo-second order were used. Results: It was 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 absorption 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 to be 384 mg/g using the Langmuir model.