Efficient rhodamine B degradation using electro‐fenton process with PbO₂‐coated titanium as the anode

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/m2, 0.05 M Na2SO4 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

The Study on Some Parameters Affecting the Degradation of Methylene Blue in Water by Electro-Fenton Using Ti/Pbo2 Anode

“…Hence, pH is one of the most important factors affecting the AO-EF process. High pH will reduce the concentration of Fe 2+ catalyst due to the formation of Fe(OH) 3 precipitate, while too low pH will lead to H 2 O 2 decomposition [23] and in both cases, the efficiency of the EF process is drastically reduced. Therefore, to clarify the influence of pH on MB decay efficiency, we only changed the initial pH of the solution in the range of 2 -6 and other parameters were kept constant: I = 0.3 A, [Fe 2+ ] = 0.1 mM, t = 60 min, MB concentration C 0 = 50 mg.L -1 .…”

“…The combination of EF-AO processes in an electrolyser has been studied by some research groups, such as: Vasconcelos et al [22] used reticulated vitreous carbon as cathode and BDD as anode of a filter-press flow cell for degradation of Reactive Black 5 dye; Wang et al [23] studied the degradation of perfluorooctanoic acid by the combination of EF-AO in an system using FeMndoped carbon cathode and BDD anode; Tian et al [24] synthesized Ti-PbO 2 material to fabricate the anode and used the graphite felt-polytetrafluoroethylene/carbon black gas diffusion cathode in the EF-AO system to decompose Rhodamine B. However, the combination of AO using Ti/PbO 2 anode and EF using CF cathode to degrade MB dye has not been reported.…”

Iron modified zeolite carrier for efficiently pharmaceutical pollutant degradation in heterogeneous electro‐Fenton: Influence factors and kinetic

“…Pseudo-first-order kinetic model well describes the PHP degradation data. The kinetic is according to Equation (6).…”

“…These radicals are highly reactive, unstable, and short lifetime (less than nanoseconds) 3,4 . The electro‐Fenton (EF) process is the combination of Fenton and electrochemical processes to achieve the high efficiency 5,6 . In this process, the reduction of oxygen forms H 2 O 2 , producing ˙OH in the presence of Fe 2+ 7,8 .…”

“…3,4 The electro-Fenton (EF) process is the combination of Fenton and electrochemical processes to achieve the high efficiency. 5,6 In this process, the reduction of oxygen forms H 2 O 2 , producing˙OH in the presence of Fe 2+ . 7,8 The ferric (Fe 3+ ) converts to ferrous (Fe 2+ ) ion on the surface of cathode.…”