Process optimization studies of congo red dye adsorption onto nickel iron layered double hydroxide using response surface methodology

Layer double hydroxide materials have many applications in areas such as biomedical, catalytic, sensor, adsorption. Recently, the LDH synthesis methods used have been increasingly developed. In this study, the Ni-Fe LDH material was synthesized by hydrothermal method and parameters affecting CR adsorption were maximized by surface response method (RSM). The results showed that the CR removal capacity reached a maximum value of 244.87 mg/g at a concentration of 136.63 mg/L, pH of 5.94 and reaction time 233.84 min. In addition, ANOVA analysis for the second-order model gave favorable results with high R2 (R2=0.991), F and p values in accordance with the proposed standards, all indicating that this model has significance between experimental variables and predict. © 2019 Trans Tech Publications Ltd, Switzerland.