The adsorption behaviors of industrial dyes by natural mordenite: isotherm, kinetic, thermodynamic, and Box-Behnken design study

The adsorption of two model dyes, methylene blue (MB) and Acid Red 97 (AR97), onto mordenite was examined in this study using an experimental design method. They used response surface modeling and a Box-Behnken surface statistical design to optimize the removal of dyes from aqueous solutions. Solution pH, the quantity of dyes, and the dose of mordenite were the three factors taken into consideration. The study discovered that the adsorption of methylene blue was significantly influenced by solution pH, with pH 10 having the best adsorption effectiveness. In contrast, pH 3 was discovered to be the ideal setting for Acid Red 97. Additionally, the scientists discovered that both dyes experienced chemisorption, which is a chemical reaction between the dye and the surface of the mordenite. The study also looked into how time, dosage, and pH affected the adsorption procedure. Further research into the impact of temperature revealed that higher temperatures resulted in greater adsorption effectiveness. The adsorption process for both dyes was endothermic and spontaneous, which is compatible with thermodynamic principles, which contend that chemical reactions are more likely to occur at higher temperatures. Compare the adsorption outcomes with various adsorbents. It was discovered that AR97 and MB had the best adsorption rates, respectively, of 1,212.76 mg and 559.8 mg/g. Overall, the study offers insightful information about the adsorption of dyes onto mordenite and emphasises the significance of taking a number of variables into account when designing an adsorption process, including solution pH, temperature, and dose.