Efficient rhodamine B degradation using electro‐fenton process with PbO2‐coated titanium as the anode. Issue 1 (14th May 2018) - Tian, Jiangnan
Abstract : To replace the high cost Pt anode, Ti based PbO2 electrode (PbO2 ‐Ti) and Ti based SnO2 doped with Sb electrode (SnO2 /Sb‐Ti) were fabricated and compared for treating 0.1 mM Rhodamine B (RhB) in Electro‐Fenton (EF) process. Scanning electron microscopy, energy dispersive X‐ray, X‐ray diffraction spectrometry were carried out to study the surface morphology, element composition, and substance composition of the anodes (PbO2 ‐Ti and SnO2 /Sb‐Ti). Linear Sweep Voltammetry, cyclic voltammetry, Tafel, and electrochemical impedance spectroscopy were conducted to examine the electrochemical properties of the anodes (Pt, PbO2 ‐Ti, SnO2 /Sb‐Ti, and Ti). These assessments showed that PbO2 ‐Ti had the best performance. Then, the influence of varied parameters (pH, types of anodes, current density, and electrolyte) were explored. Almost complete decolorization (99.01%) was reached at pH 3, current density 50 A/m 2, 0.05 M Na2 SO4 using PbO2 ‐Ti as the anode after 20 min electrolysis. Under these conditions, 90.48% of total organic carbon was removed after 180 min. Finally, the durability of PbO2 ‐Ti was evaluated via accelerated service life test and exhibited long service lifetime (∼4000 h). © 2018 American Institute of Chemical Engineers Environ Prog, 38: 189–197, 2019