Application of response surface methodology for electrochemical oxidation of the C.I. Reactive Orange 7 using flow reactor with Ti/Sb–SnO₂ anode

Abstract

In this work, the electrochemical oxidation of the C.I. Reactive Orange 7 was investigated with Ti/Sb–SnO₂ electrode as anode using a flow reactor in two modes: circulating and continuous. The Ti/Sb-SnO₂ anode was prepared using dip-coating and thermal decomposition method, and then it was characterized by scanning electron microscopy, cyclic voltammetry, and energy dispersive spectrometer. The parameters such as current density, flow rate, temperature and time for the circulating mode, and current density and flow rate for the continuous mode were selected as independent variables in central composite design, while the color removal efficiency was considered as the response function for two modes. In optimum conditions, color removal efficiency for the circulating and the continuous modes were 99.97 and 90.91%, respectively.

Keywords:

• Electrochemical oxidation
• Reactive Orange 7
• Flow reactor
• Ti/Sb–SnO₂ anode
• Central composite design (CCD)

Acknowledgments

The authors thank the University of Bu-Ali Sina, Iran for financial and other supports.