Effect of Sb dopant amount on the structure and electrocatalytic capability of Ti/Sb-SnO2 electrodes in the oxidation of 4-chlorophenol.
Ti/Sb-SnO2 anodes were prepared by thermal decomposition to examine the influence of the amount of Sb dopant on the structure and electrocatalytic capability of the electrodes in the oxidation of 4-chlorophenol. The physicochemical properties of the Sb-SnO2 coating were markedly influenced by different amounts of Sb dopant. The electrodes, which contained 5% Sb dopant in the coating, presented a much more homogenous surface and much smaller mud-cracks, compared with Ti/Sb-SnO2 electrodes containing 10% or 15% Sb dopant, which exibited larger mud cracks and pores on the surface. However, the main microstructure remained unchanged with the addition of the Sb dopant. No new crystal phase was observed by X-ray diffraction (XRD). The electrochemical oxidation of 4-chlorophenol on the Ti/SnO2 electrode with 5% Sb dopant was inclined to electrochemical combustion; while for those containing more Sb dopant, intermediate species were accumulated. The electrodes with 5% Sb dopant showed the highest efficiency in the bulk electrolysis of 4-chlorophenol at a current density of 20 mA/cm2 for 180 min; and the removal rates of 4-chlorophenol and COD were 51.0% and 48.9%, respectively.
Kong
Jiang-tao
JT
Key Laboratory of Water and Sediment Sciences, Ministry of Education of China, Department of Environmental Engineering, Peking University, Beijing 100871, China. kongjiangtao@iee.pku.edu.cn
Shi
Shao-yuan
SY
Zhu
Xiu-ping
XP
Ni
Jin-ren
JR
D000965:Antimony / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D017971:Tin Compounds / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
D002733:Chlorophenols; D017971:Tin Compounds; C029107:4-chlorophenol; D000965:Antimony; D014025:Titanium; C045358:stannic oxide