利用硅溶胶的成膜性、纳米二氧化钛-氧化锌大的比表面积及导电胶的粘结性,制备了纳米二氧化钛-氧化锌/硅溶胶/导电胶复合材料,基于此复合材料将联吡啶钌固定到金电极表面,制备了磷酸可待因电化学发光（ECL）传感器。在优化的实验条件（8...利用硅溶胶的成膜性、纳米二氧化钛-氧化锌大的比表面积及导电胶的粘结性,制备了纳米二氧化钛-氧化锌/硅溶胶/导电胶复合材料,基于此复合材料将联吡啶钌固定到金电极表面,制备了磷酸可待因电化学发光（ECL）传感器。在优化的实验条件（800 V负高压、扫描速度100 m V/s,磷酸盐缓冲体系（p H 6.5））下,可待因浓度在1.0×10^-7-1.0×10^-4mol/L范围内与电化学发光强度呈良好的线性关系（r^2=0.9973）,检出限为2.56×10^-8mol/L（S/N=3）。传感器表现出良好的重现性与稳定性,连续平行测定1.28×10^-5mol/L可待因溶液10次,发光强度的相对标准偏差（RSD）为2.7%;室温下保存10天后,发光强度为初始值的92%以上。测定可待因药物实际样品的加标回收率在99.3%-102.5%之间。展开更多
The fabrication of multicomponent heterojunctions is an effective strategy to improve the performance of TiO2 based photocatalysts. We provide a new strategy for improving the charge separation and photocatalytic perf...The fabrication of multicomponent heterojunctions is an effective strategy to improve the performance of TiO2 based photocatalysts. We provide a new strategy for improving the charge separation and photocatalytic performance of ZnO /TiO2 composites by the formation of multichannel charge separated heterojunctions. ZnO /P25 composites were prepared by an incipient wetness impregnation method, and applied for the photocatalytic destruction of gaseous toluene. The ZnO /P25 composites consist of anatase TiO2（ATiO2）, rutile TiO2（RTiO2） and hexagonal zincite structures. The parasitic phase of ZnO in P25 leads to the formation of ZnO（002）/ATiO2（101）/RTiO2（110） heterojunctions that exhibit enhanced light absorption and improved multichannel electron/hole separation. ZnO /P25 heterojunctions can completely oxidize toluene into CO2 and H2O under ultraviolet light irradiation at room temperature, and show enhanced photocatalytic activity in comparison with P25 owing to the efficient electron-hole separation. Such a multichannel charge separated design strategy may provide new insight into the design of highly effective photocatalysts and their potential technological applications.展开更多
文摘利用硅溶胶的成膜性、纳米二氧化钛-氧化锌大的比表面积及导电胶的粘结性,制备了纳米二氧化钛-氧化锌/硅溶胶/导电胶复合材料,基于此复合材料将联吡啶钌固定到金电极表面,制备了磷酸可待因电化学发光（ECL）传感器。在优化的实验条件（800 V负高压、扫描速度100 m V/s,磷酸盐缓冲体系（p H 6.5））下,可待因浓度在1.0×10^-7-1.0×10^-4mol/L范围内与电化学发光强度呈良好的线性关系（r^2=0.9973）,检出限为2.56×10^-8mol/L（S/N=3）。传感器表现出良好的重现性与稳定性,连续平行测定1.28×10^-5mol/L可待因溶液10次,发光强度的相对标准偏差（RSD）为2.7%;室温下保存10天后,发光强度为初始值的92%以上。测定可待因药物实际样品的加标回收率在99.3%-102.5%之间。
基金supported by the National Natural Science Foundation of China(21576298,21425627)the Science and Technology Plan Project of Guangdong Province(2013B090500029)+1 种基金Natural Science Foundation of Guangdong Province(2014A030313135,2014A030308012)the State Key Laboratory of Chemical Resource Engineering(CRE-2015-C-301),China~~
文摘The fabrication of multicomponent heterojunctions is an effective strategy to improve the performance of TiO2 based photocatalysts. We provide a new strategy for improving the charge separation and photocatalytic performance of ZnO /TiO2 composites by the formation of multichannel charge separated heterojunctions. ZnO /P25 composites were prepared by an incipient wetness impregnation method, and applied for the photocatalytic destruction of gaseous toluene. The ZnO /P25 composites consist of anatase TiO2（ATiO2）, rutile TiO2（RTiO2） and hexagonal zincite structures. The parasitic phase of ZnO in P25 leads to the formation of ZnO（002）/ATiO2（101）/RTiO2（110） heterojunctions that exhibit enhanced light absorption and improved multichannel electron/hole separation. ZnO /P25 heterojunctions can completely oxidize toluene into CO2 and H2O under ultraviolet light irradiation at room temperature, and show enhanced photocatalytic activity in comparison with P25 owing to the efficient electron-hole separation. Such a multichannel charge separated design strategy may provide new insight into the design of highly effective photocatalysts and their potential technological applications.
