Preparation and characterization of a novel porous Ti/SnO₂–Sb₂O₃–CNT/PbO₂electrode for the anodic oxidation of phenol wastewater

Abstract

a Porous Ti/SnO2-Sb2O3-CNT/PbO2 electrodes were successfully fabricated using thermal decomposition technique and electro-deposition technologies. Characterization experiments including Scanning electron microscopy (SEM), Energydispersive spectroscopy (EDS), X-ray diffraction (XRD), Cyclic voltammertry (CV), Electrochemical Impedance Spectroscopy (EIS) and accelerated life time test was performed to evaluate the effect of CNT-doped SnO2-Sb2O3 intermediate layer on PbO2 electrode. The results showed that CNT could be doped into the SnO2-Sb2O3 intermediate layer by thermal decomposition. Compared with porous Ti/SnO2-Sb2O3 substrate, CNT-doped induced the substrate surface forming a fibrous structure, it means that porous Ti/SnO2-Sb2O3-CNT substrate would provide more active sites for PbO2 deposition and could make a compact and fine surface coating. Besides, the CNT modified electrode had higher active surface area and higher electrochemical activity than without CNT doped. The life of porous Ti/SnO2-Sb2O3-CNT/PbO2 (296h) was 1.38 times as much as that of porous Ti/SnO2-Sb2O3/PbO2 electrode (214h). Electro-catalytic oxidation of phenol in aqueous solution was studied to evaluate the electrochemical oxidation ability in environment science. Porous Ti/SnO2-Sb2O3-CNT/PbO2 electrode displayed not only excellent electro-catalytic performance but also low energy consumption using phenol as a model organic pollutant. The porous Ti/SnO2-Sb2O3-CNT/PbO2 electrode has higher kinetic rate constant and chemical oxygen demand (COD), which is 1.73 and 1.09 times those of the porous Ti/SnO2-Sb2O3/PbO2 electrode, respectively. Moreover, CNT-doped can further increase the hydroxyl radical (·OH) generation capacity. All these results illustrated that porous Ti/SnO2-Sb2O3-CNT/PbO2 electrode for pollutants degradation and had a great potential application.

Study on the Preparation and Characterizations of an Improved Porous Ti/TiO2/CdS‐CNT/C3N4 Photoelectrode and Photoelectric Catalytic Degradation of Methylene Blue

“…An oxidation peak appeared in the anodic branch of the curve, which implied that TiO 2 , CdS and C 3 N 4 could carry out redox reaction between 0 and 0.25 V. The oxidation peak current of Ti/TiO 2 /CdS‐CNT/C 3 N 4 electrode is higher than the other two electrodes, indicating that the PEC activity of C 3 N 4 is better than CdS and TiO 2 , which further verified the previous literature ,. Additionally, the CNT‐modified interlayer can increase the oxidation ability and catalytic activity of the electrodes …”

Enhanced electrochemical oxidation of phenol by boron-doped diamond nanowire electrode

“…11 Several candidates for the anode material, including Pt, IrO 2 , SnO 2 , PbO 2 , glassy carbon (GC) and boron-doped diamond (BDD), have been investigated. [15][16][17][18] Among these, BDD has been widely accepted as the most powerful anode material because of to its extremely high overpotential for the oxygen evolution reaction (OER). 11,19,20 Additionally, BDD exhibits weak adsorption characteristics and tends to be chemically inert; consequently, numerous electrochemical wastewater treatment studies have been conducted on various organic oxidation mechanisms involving BDD anodes.…”

Bentonite-supported nanoscale zero-valent iron granulated electrodes for industrial wastewater remediation

“…Compared with traditional methods, the electrochemical method has become a hot focus due to its simplicity and ease of operation, high efficiency and eco-friendly characteristics. [2][3][4] It provides a high efficiency for removing bio-refractory organic pollutants. 5 Compared to conventional electrode methods, granulated electrodes in a 3D system have much shorter interelectrode distances to allow faster electron transfer rates leading to faster remediation.…”