Author(s)

A. Negrea, P. Negrea, M. Ciopec, I. Grozav, L. Lupa & C. M. Davidescu

Abstract

One of the main aims for a process is to find the optimum values of the parameters which assure the desired values of the process responses. This activity must be made in the minimum of the time and with the minimum use of consumable resources. The design of the experiments (DoE) assisted by the computer assures that this happens. In this paper, DoE was used to study the adsorption performance of Fe-XAD8-DEHPA in the removal process of As(V) ions from aqueous solutions. It was observed that the Adsorption Capacity and the Efficiency in the removal process of As(V) from the aqueous solution was significantly influenced by concentration and pH. The mathematical model of the process is very good. It includes the experimental data of over 99% in the case of adsorption capacity and over 97% in the case of efficiency. From the contour plots of adsorption capacity and efficiency can be seen that the chemical process is nonlinear. The DOE helped us to find the optimum values of the control factors (pH, contact time and arsenic initial concentrations from solutions) in order to obtain maximum values of Adsorption Capacity and Efficiency. Keywords: arsenic adsorption, Fe-XAD8-DEHPA, design of experiments.

Keywords

arsenic adsorption, Fe-XAD8-DEHPA, design of experiments