Application of a Three-Dimensional Electrochemical Process Catalyzed by Mwcnts-Oh As Particle Electrode for Ciprofloxacin Removal From Aqueous Solutions Publisher



Rahimifarzan E¹ ; Mahvi AH² ; Mengelizadeh N³ Show Affiliations
Source: Desalination and Water Treatment Published:2021

Abstract

In this study, the three-dimensional electrochemical (3DE) process with the Ti/PbO2 electrode in the presence of OH functionalized multi-walled carbon nanotube (MWCNTs-OH) was used for the removal of ciprofloxacin (CIP) from aqueous solutions. Box–Behnken design-based response surface methodology (RSM-BBD) was used to optimize the 3DE process. The results of the RSM model showed a statistical relationship between the laboratory values and the prediction of CIP removal. The results of the contribution percentages (PC) and F-value showed that the initial CIP concentration (PC = 58.27% and F = 735.54) and the particle electrode dosage (PC = 21.83% and F = 275.54) play an important role in increasing the efficiency of the electrochemical process. 87.19% CIP removal and 67.8% chemical oxygen demand (COD) removal were obtained at pH of 3, the current of 300 mA, CIP concentration of 30 mg/L, the MWCNTs-OH dosage of 100 mg/L, the distance of 1 cm, and the time of 90 min. COD removal and H2O2 production were much higher in the 3D process than in the two-dimensional process. Various oxidants experiments showed that the presence of peroxymonosulfate (PMS) and persulfate (PS) resulted in complete degradation of CIP at 45 min. Scavenging experiments confirmed this increase in efficiency based on the greater production of hydroxyl radical and sulfate through the electrochemical decomposition of PMS and PS. Finally, the results of the present study showed that the 3DE process using different oxidants and MWCNTs-OH is a suitable and environmentally friendly method for the removal of CIP from aqueous solutions. © 2021 The Author(s). Published by Desalination Publications.