Several Ti supported oxide anodic materials are prepared by thermal decomposition method and the anodic kinetic parameters ( a,b,i 0) are determined in 1 mol/L H 2SO 4 solution. The SEM photographs of the electrodes a...Several Ti supported oxide anodic materials are prepared by thermal decomposition method and the anodic kinetic parameters ( a,b,i 0) are determined in 1 mol/L H 2SO 4 solution. The SEM photographs of the electrodes are scanned and saved as a BMP image file, from which a three dimensional space with graph and grey scale is obtained. Then the fractal dimension of the electrodes is calculated by using the formula D B( F ) =log N δ(F )/-log δ and a calculation program. The electrocatalytic performance of the electrodes is discussed combining with the fractal dimension and kinetic parameters. The influences of the electrode composition on the kinetic parameters are also discussed according to the dual barrier model and mechanism of the oxygen evolution at oxide anodes. The results show that the larger fractal dimension of the electrodes is, the better electrocatalytic activity is.展开更多
The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the...The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the non-electrolysis system respectively.Additionally,the influence of the decomposition of H2O2 caused by Ti-based oxide electrode on the oxidation of aniline was also investigated.The results showed that both higher loading of oxides and higher pH were able to accelerate the decomposition of H2O2 in the non-electrolysis system and in this case the decay of H2O2 was mainly caused by the catalytic action of the oxides coating.In the electrolysis system with Ti-based oxides electrode as anode,the decay rate of H2O2 increased with increasing anodic potential.In this case,the decay of H2O2 involved two mechanisms: catalytic decomposition and electrochemical oxidation.It was also found that the catalytic decomposition of H2O2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H2O2 was only slightly helpful to the oxidation of aniline.This work suggested that using the appropriate anodes of less H2O2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H2O2.展开更多
研究了钛基氧化物涂层电极应用在化工废水深度处理中的实验研究,经静态小试试验验证,论证哪种电极在化工废水深度处理中应用效果较好,并通过实验研究该电极在化工废水深度处理中应用时的最佳实验条件,分析钛基氧化物涂层电极在化工废水...研究了钛基氧化物涂层电极应用在化工废水深度处理中的实验研究,经静态小试试验验证,论证哪种电极在化工废水深度处理中应用效果较好,并通过实验研究该电极在化工废水深度处理中应用时的最佳实验条件,分析钛基氧化物涂层电极在化工废水深度处理中工程应用的可行性,通过动态中试实验,验证其长期运行效果。实验结果表明:选用钌钛电极做阳极应用于化工废水深度处理可行性较高,电解时间为2 h。综合比较经济成本,在电流密度为25 m A/cm2时,处理成本较低,效果较好。动态中试实验效果分析,通过电解法进行化工废水深度处理,吨水处理成本约为9.8元,且运行较为稳定,不会产生二次污染,应用性较高。展开更多
文摘Several Ti supported oxide anodic materials are prepared by thermal decomposition method and the anodic kinetic parameters ( a,b,i 0) are determined in 1 mol/L H 2SO 4 solution. The SEM photographs of the electrodes are scanned and saved as a BMP image file, from which a three dimensional space with graph and grey scale is obtained. Then the fractal dimension of the electrodes is calculated by using the formula D B( F ) =log N δ(F )/-log δ and a calculation program. The electrocatalytic performance of the electrodes is discussed combining with the fractal dimension and kinetic parameters. The influences of the electrode composition on the kinetic parameters are also discussed according to the dual barrier model and mechanism of the oxygen evolution at oxide anodes. The results show that the larger fractal dimension of the electrodes is, the better electrocatalytic activity is.
文摘The decomposition of H2O2 at the Ti-based oxide electrode coated with IrO2,RuO2 and TiO2 (Ti/ IrO2/RuO2/TiO2) prepared by thermal decomposition,was investigated in the electrolysis system of constant potential and the non-electrolysis system respectively.Additionally,the influence of the decomposition of H2O2 caused by Ti-based oxide electrode on the oxidation of aniline was also investigated.The results showed that both higher loading of oxides and higher pH were able to accelerate the decomposition of H2O2 in the non-electrolysis system and in this case the decay of H2O2 was mainly caused by the catalytic action of the oxides coating.In the electrolysis system with Ti-based oxides electrode as anode,the decay rate of H2O2 increased with increasing anodic potential.In this case,the decay of H2O2 involved two mechanisms: catalytic decomposition and electrochemical oxidation.It was also found that the catalytic decomposition of H2O2 at the oxides electrode was useless to the oxidation of aniline while the electrochemical oxidation of H2O2 was only slightly helpful to the oxidation of aniline.This work suggested that using the appropriate anodes of less H2O2 decomposition as well as reasonable potential in the electro-Fenton process could achieve high chemical efficiency of H2O2.
文摘研究了钛基氧化物涂层电极应用在化工废水深度处理中的实验研究,经静态小试试验验证,论证哪种电极在化工废水深度处理中应用效果较好,并通过实验研究该电极在化工废水深度处理中应用时的最佳实验条件,分析钛基氧化物涂层电极在化工废水深度处理中工程应用的可行性,通过动态中试实验,验证其长期运行效果。实验结果表明:选用钌钛电极做阳极应用于化工废水深度处理可行性较高,电解时间为2 h。综合比较经济成本,在电流密度为25 m A/cm2时,处理成本较低,效果较好。动态中试实验效果分析,通过电解法进行化工废水深度处理,吨水处理成本约为9.8元,且运行较为稳定,不会产生二次污染,应用性较高。
