Electrochemical degradation of 4-chlorophenol at nickel–antimony doped tin oxide electrode

Abstract

The effectiveness of a novel nickel-antimony doped tin oxide electrode for electrochemical degradation of organic pollutants was investigated using 4-chlorophenol (4-CP) as a model toxic organic. The experimental results demonstrate that the optimal Ni content was at Ni:Sn=1:500 in atomic ratio in the precursor coating solution, whereas the Sb:Sn ratio was set at 8:500. Using the electrode prepared with the optimal Ni doping ratio for 4-CP degradation, the charge-based efficiencies were up to 89 microg C(-1) for 4-CP destruction and 15 microg C(-1) for TOC removal, which were considerably higher than the efficiencies observed for other electrodes. It is suggested that the enhancement of the electrode for electrochemical oxidation of organics could be attributed to the production of hydroxyl radicals in anodic water electrolysis.

The degradation of phenol derivates from wastewaters by electrochemical treatment

“…For all electrodes application in the 4-CP degradation by using both CA and MPA techniques for 2 hours, after each measurement the final concentration of 4-CP was determined spectrophotometrically and the electrochemical efficiency for 4-CP oxidation was obtained based on the equation [13]:…”

Decontamination of Wastewaters Containing Organics by Electrochemical Methods

“…The degradation process efficiency (, %) and electrochemical degradation efficiency (E, mg/C· cm 2 ) for organics degradation was determined based on equations (1) and (2) [37,38]:…”

Anodic Materials with High Energy Efficiency for Electrochemical Oxidation of Toxic Organics in Waste Water

“…These redox couples can be added to or present in the waste water. In irreversible process, strong oxidants like ozone Wang et al, 2006), chlorine (Panizza & Cerisola, 2003), hydrogen peroxide (Brillas et al, 1996;Brillas et al, 1995;Do & Chen, 1993) and hydroxyl free radicals etc. are generated and in-situ applied to mineralize the organic pollutants.…”

“…It was found that by incorporating different metal oxides into the Sb-doped SnO 2 coating, the lifetime was significantly increased. Wang et al (2006) and Chen et al (2010) found out that introducing trace amount of nikel into antimony doped tin oxide electrode could enhance its activity toward 4-chlorophenol and phenol degradation. The possible reason may be due to the hybrid effect of electrooxidation and ozone oxidation because ozone could be in-situ generated on this type anode during electrolysis.…”