Research on synthesis of Ca-Al LDHs materials and optimization of Congo Red adsorption capacity by response surface method (RSM)

Abstract

In this study, Ca-Al LDHs materials were successfully synthesized via hydrothermal method. Three factors affecting Congo red (CR) adsorption capacity include: the influence of CR solution concentration, the effects of solution pH and the reaction time, which were experimented via response surface method ( RSM) to find the optimal conditions for CR removal. The experimental results showed that at the concentration of CR 54.3 mg/L, the reaction time of 104 minutes and pH 5.9, the optimal 68.58 mg/g CR adsorbed solution was achieved. These results suggest that Ca-Al LDHs are used as an effective adsorbent to remove organic pigments in aqueous solutions.