Removal of diazinon from aqueous solutions using 3D electrochemical system including a nanocomposite of microbial cellulose/nanomagnetite

Abstract

In this study, with the aim of improving of the diazinon removal efficiency, a 3D electrochemical system was provided including microbial cellulose/Fe3O4 (MC/Fe3O4) nanocomposite. The MC/Fe3O4 nanocomposite was utilized for the activation of persulfate (PS) in the diazinon decomposition process. The characterization of the MC/Fe3O4 nanocomposite was determined by FE-SEM, FT-IR, XRD and TGA analysis. The operating variables including initial pH, NaCl concentration, PS concentration, initial diazinon concentration, current density and time were investigated. The proposed 3D electrochemical system in the optimal conditions of 10 mg/L initial diazinon concentration, pH 3, 0.2 g/L NaCl, 0.07 mmol/L PS, 3.54 mA/cm2 current density and energy consumption of 12.61 kWh/m3 during 60 min reached to the complete removal of diazinon and 84.4 % TOC removal. According to the obtained results, the MC/Fe3O4 nanocomposite has the high efficiency of diazinon and TOC removal, as well as the consumption of NaCl, PS and lower energy in a shorter period of time compared to general electrochemical processes. Therefore, the reactions provide not only on the surface of the main electrodes but also on the surface of the particle electrode. It can improve the performance of electroabsorption and electrocatalysis in the chemical electrooxidation system.