This work focused on the removal of As(V) using chitosan-coated bentonite (CCB) from groundwater in a fixed-bed system. Thomas and Yoon-Nelson models were applied to the experimental data in order to predict breakthrough curves and assess model parameters. Response surface methodology based on Box-Behnken design was utilized to optimize parameters such as adsorbent mass (6.0-8.0g), flow rate (0.6-1.0mL/min), and initial concentration (100-500g/g) and to evaluate the interactive effects of the variables on the As(V) adsorption capacity at breakthrough point. Results showed that the optimum As(V) uptake capacity at breakthrough point of 10.57g/g could be attained at initial concentration of 418.12g/g, CCB mass of 6.6g, and flow rate of 0.65mL/min. Based on the analysis of variance, the high value of coefficient of determination (R(2)0.9712) indicates that the quadratic model best describes the experimental data, and the initial concentration is a significant factor on the As(V) adsorption capacity at breakthrough point.
關聯:
Desalination and Water Treatment, v.57 n.40, pp.18739-18747
