Optimization of Adsorption Process Parameters of Allura Red Removal Using Nanodiopside/Zn-Fe Layered Double Hydroxide Composite by Response Surface Methodology: A Kinetic, Thermodynamic, and Equilibrium Approach

To optimize the Allura Red adsorption parameters on nanodiopside/ZnFe-LDH composite, response surface methodology was employed.To ensure a high performance over the experimental ranges employed, and to compare the conjunct effects of the initial concentration of Allura Red, pH, adsorbent dosage, temperature and contact time on the adsorption process such optimization was convinced . A total of 32 adsorption experimental runs were carried out employing the detailed conditions designed by response surface methodology based on the Box–Behnken design in order to optimize the status employed in the batch process. By analysis of variance (ANOVA) it is indicated that a second-order polynomial regression equation was the most appropriate polynomial for fitting the experimental data. The experimental verification tests presented a complement between the predicted and experimental responses (R2). The optimal point obtained was located in the valid region and the optimum adsorption parameters were approximated as an initial Allura Red concentration of 19.80 mg/L, a pH value of 4.09, and adsorbent dosage of 0.04 g, a temperature of 32.61°C and contact time of 23.93 min.