The microwave dielectric properties of ZrO2-SnO2-TiO2 （ZST） system ceramics were stu- died as a function of the amount of Sb2O5 dopant. With the addition of 0—0.50/0 Sb2O5 （molar ratio）, the substitution of Ti 4+...The microwave dielectric properties of ZrO2-SnO2-TiO2 （ZST） system ceramics were stu- died as a function of the amount of Sb2O5 dopant. With the addition of 0—0.50/0 Sb2O5 （molar ratio）, the substitution of Ti 4+ ions with Sb 5+ ions decreased the sintering temperature and increased the quality factor Q due to the reduction of oxygen vacancies. When the amount of Sb 5+ increased further （above 0.50/0）, Q was decreased by increasing the electron concentration. When the system doped with 0.50/0 Sb2O5 was sintered at 1 150 ℃ for 6 h, the relative dielectric constant ε, Qf0, and the temperature coefficient of resonant frequency （TCF） were 38.46, 44 500 GHz,20.0×10 -6 /℃, respectively, at 6 GHz.展开更多
The electrochemical oxidation of chlorimuron-ethyl on metry. The electrochemical behaviour of the electrode in a sodium Ti/SnO2-Sb2O5/PbO2 electrode was studied by cyclic voltamsulfate solution and in the mixture solu...The electrochemical oxidation of chlorimuron-ethyl on metry. The electrochemical behaviour of the electrode in a sodium Ti/SnO2-Sb2O5/PbO2 electrode was studied by cyclic voltamsulfate solution and in the mixture solution of sodium sulfate and chlorimuron-ethyl was studied. The experimental results of cyclic voltammetry show that the acidic medium was suitable for the efficient electrochemical oxidation of chlorimuron-ethyl. Some electro-generated reagent was formed in the electrolysis process and chlorimuron-ethyl could be oxidized by the electro-generated reagent. A Ti/SnO2-Sb2O5/PbO2 electrode was used as the anode and the electrolysis experiment was carried out under the optimized conditions. The electrolysis process was monitored by UV-Vis spectrometry and high performance liquid chromatography（HPLC）, and the chemical oxygen demand（COD） was determined by the potassium dichromate method. The mechanism of chlorimuron-ethyl to be oxided was studied primarily by the cyclic voltammetry and UV-Vis spectrometry. The results of electrolysis experiment demonstrate the possibility of the electrode to be used as an anode for the electrochemical treatment of chlorimuron-ethyl contained in waste water.展开更多
基金Supported by Natural Science Foundation of Tianjin (No.06YFJMJC01000) the High Technique Research and Development Pro-gram of China (No.2001AA325110).
文摘The microwave dielectric properties of ZrO2-SnO2-TiO2 （ZST） system ceramics were stu- died as a function of the amount of Sb2O5 dopant. With the addition of 0—0.50/0 Sb2O5 （molar ratio）, the substitution of Ti 4+ ions with Sb 5+ ions decreased the sintering temperature and increased the quality factor Q due to the reduction of oxygen vacancies. When the amount of Sb 5+ increased further （above 0.50/0）, Q was decreased by increasing the electron concentration. When the system doped with 0.50/0 Sb2O5 was sintered at 1 150 ℃ for 6 h, the relative dielectric constant ε, Qf0, and the temperature coefficient of resonant frequency （TCF） were 38.46, 44 500 GHz,20.0×10 -6 /℃, respectively, at 6 GHz.
基金Supported by the Science and Technology Foundation of the Education Department of Liaoning Province,China (No.2009A557)
文摘The electrochemical oxidation of chlorimuron-ethyl on metry. The electrochemical behaviour of the electrode in a sodium Ti/SnO2-Sb2O5/PbO2 electrode was studied by cyclic voltamsulfate solution and in the mixture solution of sodium sulfate and chlorimuron-ethyl was studied. The experimental results of cyclic voltammetry show that the acidic medium was suitable for the efficient electrochemical oxidation of chlorimuron-ethyl. Some electro-generated reagent was formed in the electrolysis process and chlorimuron-ethyl could be oxidized by the electro-generated reagent. A Ti/SnO2-Sb2O5/PbO2 electrode was used as the anode and the electrolysis experiment was carried out under the optimized conditions. The electrolysis process was monitored by UV-Vis spectrometry and high performance liquid chromatography（HPLC）, and the chemical oxygen demand（COD） was determined by the potassium dichromate method. The mechanism of chlorimuron-ethyl to be oxided was studied primarily by the cyclic voltammetry and UV-Vis spectrometry. The results of electrolysis experiment demonstrate the possibility of the electrode to be used as an anode for the electrochemical treatment of chlorimuron-ethyl contained in waste water.
