A drop of iron magnetic dextran microspheres(IMDM) dispersion with the volume of 6μL was cast on the surface of a glassy carbon electrode(GCE) to fabricate a modified electrode,which showed an excellent electrocataly...A drop of iron magnetic dextran microspheres(IMDM) dispersion with the volume of 6μL was cast on the surface of a glassy carbon electrode(GCE) to fabricate a modified electrode,which showed an excellent electrocatalytic activity for the oxidation of hydroquinone.The effect of the constitute and amount of modified film,the type and pH value of electrolytes on the voltammetric behavior of hydroquinone was investigated to obtain the optimum experimental conditions.Due to its wide linear range,excellent selectivity,stability and reproducibility,The modified electrode can be applied to the electrochemical determination of the hydroquinone.展开更多
Synthetic method of solid superacid TiSiW 12 O 40 /TiO 2 was described.The synthesis of iso amyl propionate catalyzed by TiSiW 12 O 40 /TiO 2 has been studied and the factors influencing on the yield is discussed.It s...Synthetic method of solid superacid TiSiW 12 O 40 /TiO 2 was described.The synthesis of iso amyl propionate catalyzed by TiSiW 12 O 40 /TiO 2 has been studied and the factors influencing on the yield is discussed.It shows that it’s an excellent catalyst,the yield of the iso amyl propionate can be over 77% when the molar ratio of iso amyl alcohol and propionic acid is 1.2,the quality of TiSiW 12 O 40 /TiO 2 is equal to 1.5% feed stock,the reaction time is 80min and the reaction temperature is about 103～107℃.展开更多
采用直接滴涂法制备多孔磁性微球/过氧化物酶(PMMS/POD)修饰的碳糊电极。运用电化学阻抗法、循环伏安法和稳态安培法对该修饰电极进行表征和研究。系统地考察了底液pH值,扫描速率对修饰电极影响,找出最佳实验条件。计算出扩散系数D为5.0...采用直接滴涂法制备多孔磁性微球/过氧化物酶(PMMS/POD)修饰的碳糊电极。运用电化学阻抗法、循环伏安法和稳态安培法对该修饰电极进行表征和研究。系统地考察了底液pH值,扫描速率对修饰电极影响,找出最佳实验条件。计算出扩散系数D为5.03×10-10cm2.s-1,表征酶活性的米氏常数为0.069 m mol.L-1.在优化条件下,该H2O2传感器的响应时间小于10s,考察了该修饰电极对H2O2稳态安培响应,在0.1m mol.L-1～0.8 m mol.L-1浓度范围内,稳态安培电流与H2O2浓度成较好线性关系,检测限为0.03 m mol.L-1(S/N=3).展开更多
文摘A drop of iron magnetic dextran microspheres(IMDM) dispersion with the volume of 6μL was cast on the surface of a glassy carbon electrode(GCE) to fabricate a modified electrode,which showed an excellent electrocatalytic activity for the oxidation of hydroquinone.The effect of the constitute and amount of modified film,the type and pH value of electrolytes on the voltammetric behavior of hydroquinone was investigated to obtain the optimum experimental conditions.Due to its wide linear range,excellent selectivity,stability and reproducibility,The modified electrode can be applied to the electrochemical determination of the hydroquinone.
文摘Synthetic method of solid superacid TiSiW 12 O 40 /TiO 2 was described.The synthesis of iso amyl propionate catalyzed by TiSiW 12 O 40 /TiO 2 has been studied and the factors influencing on the yield is discussed.It shows that it’s an excellent catalyst,the yield of the iso amyl propionate can be over 77% when the molar ratio of iso amyl alcohol and propionic acid is 1.2,the quality of TiSiW 12 O 40 /TiO 2 is equal to 1.5% feed stock,the reaction time is 80min and the reaction temperature is about 103～107℃.
文摘采用直接滴涂法制备多孔磁性微球/过氧化物酶(PMMS/POD)修饰的碳糊电极。运用电化学阻抗法、循环伏安法和稳态安培法对该修饰电极进行表征和研究。系统地考察了底液pH值,扫描速率对修饰电极影响,找出最佳实验条件。计算出扩散系数D为5.03×10-10cm2.s-1,表征酶活性的米氏常数为0.069 m mol.L-1.在优化条件下,该H2O2传感器的响应时间小于10s,考察了该修饰电极对H2O2稳态安培响应,在0.1m mol.L-1～0.8 m mol.L-1浓度范围内,稳态安培电流与H2O2浓度成较好线性关系,检测限为0.03 m mol.L-1(S/N=3).
