Magnetic Fe3O4 nanospheres with a average diameter of （201±0.5） nm were synthesized at 200℃ via a solvothermal method. The as-synthesized Fe3O4 nanospheres performed an efficiency in the Fenton degradation of ...Magnetic Fe3O4 nanospheres with a average diameter of （201±0.5） nm were synthesized at 200℃ via a solvothermal method. The as-synthesized Fe3O4 nanospheres performed an efficiency in the Fenton degradation of xylenol orange with a degradation rate of 90%-95%. Additionally, the catalyst was easily recyclable and the recovery rate was greater than 90%. Moreover, the catalyst could be regenerated under an ultrasonic treatment, and the degradation performance remained essentially the same. More importantly, the degradation rate varied with respect to the amount of H2O2 and the pH of the best reaction process. And the reaction efficiency was achieved with 1.5 mL of H2O2 in an acidic environment.展开更多
Fe-doped ZrO2 compounds were prepared by a co-precipitation method.The compounds were characterized by X-ray diffraction,N2 adsorption-desorption,ultraviolet diffuse reflectance infrared Fourier transform spectroscopy...Fe-doped ZrO2 compounds were prepared by a co-precipitation method.The compounds were characterized by X-ray diffraction,N2 adsorption-desorption,ultraviolet diffuse reflectance infrared Fourier transform spectroscopy,scanning electron microscopy-energy-dispersive X-ray spectroscopy,transmission electron microscopy,NH3 temperature-programmed desorption,X-ray photoelectron spectroscopy,and in situ Fourier transform infrared spectroscopy.The incorporation of Fe into ZrO2 lattice favored and effectively stabilized the formation of purely ZrO2 tetragonal phase.Subsequently,the catalytic activity of the Fe-doped ZrO2 compounds was evaluated toward vapor phase methylation of phenol.The catalytic activity was governed by Fe content and related to the Lewis acidity of the prepared catalyst.展开更多
Expansion graphite (EG) processing of an expanded volume of 400 mL/g was prepared with 50 mesh crude graphite after chemical oxidation intercalation of potassium permanganate and vitriol, and its adsorption kinetics a...Expansion graphite (EG) processing of an expanded volume of 400 mL/g was prepared with 50 mesh crude graphite after chemical oxidation intercalation of potassium permanganate and vitriol, and its adsorption kinetics and thermodynamics characteristics for xylenol orange (XO) was investigated. In thermodynamic study, adsorption isotherm and free energy change (⊿G°) were detected and calculated, respectively. Influence of ionic strength on adsorbance was investigated. Kinetic studies were carried out with a series of XO concentration under different temperatures, and the data were simulated with pseudo first-order and second-order kinetic model, respectively. Results illustrate: adsorption of EG for XO is a spontaneous process, and adsorption isotherm is type II;equilibrium adsorbance increases with the increase of ionic strength. Kinetic studies show that the kinetic data can be delineated by pseudo second-order kinetic model. Initial adsorption rate increases with the increase of temperature. Adsorption activation energy is less than 20 kJ/mol;physical adsorption is the major mode of the overall adsorption process.展开更多
A dual-readout sensing platform based on two signal transduction channels can integrate the unique advantages of each sensing pattern,compensate for the deficiency in the adaptive capacity,and enable a more convincing...A dual-readout sensing platform based on two signal transduction channels can integrate the unique advantages of each sensing pattern,compensate for the deficiency in the adaptive capacity,and enable a more convincing performance in analytical applications.Here,we introduce a responsive molecule dye,xylenol orange(XO),to combine with lanthanide terbium ions(Tb^(3+)).The resultant Tb^(3+)-XO complex exhibited tunable optical properties and was used as a novel colorimetric and luminometric dual-readout sensing platform for assaying the anthrax biomarker,dipicolinic acid(DPA).In the presence of Tb^(3+),the XO solution underwent a color change from yellow to magenta;however,upon adding DPA,the color changed back to yellow immediately,accompanied by the characteristic luminescence emission of Tb^(3+).Considering the strong affinity between DPA/XO and metal ions,the proposed sensing platform was further employed for the determination and differentiation of certain metal ions using linear discriminant analysis.This convenient dual-readout sensing platform offers several notable features and significantly promotes the application and development of lanthanide-based materials.展开更多
基金Supported by the National Natural Science Foundation of China（No.31400497）, the Fundamental Research Funds for the Central Universities, China（No.2572017BB14）, the Heilongjiang Postdoctoral Financial Assistance, China（No.LBH-Z13001）, the General Financial Grant from the China Postdoctoral Science Foundation, China（No.2014M561311） and the Open Project of State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, China（No.2016-24）.
文摘Magnetic Fe3O4 nanospheres with a average diameter of （201±0.5） nm were synthesized at 200℃ via a solvothermal method. The as-synthesized Fe3O4 nanospheres performed an efficiency in the Fenton degradation of xylenol orange with a degradation rate of 90%-95%. Additionally, the catalyst was easily recyclable and the recovery rate was greater than 90%. Moreover, the catalyst could be regenerated under an ultrasonic treatment, and the degradation performance remained essentially the same. More importantly, the degradation rate varied with respect to the amount of H2O2 and the pH of the best reaction process. And the reaction efficiency was achieved with 1.5 mL of H2O2 in an acidic environment.
文摘Fe-doped ZrO2 compounds were prepared by a co-precipitation method.The compounds were characterized by X-ray diffraction,N2 adsorption-desorption,ultraviolet diffuse reflectance infrared Fourier transform spectroscopy,scanning electron microscopy-energy-dispersive X-ray spectroscopy,transmission electron microscopy,NH3 temperature-programmed desorption,X-ray photoelectron spectroscopy,and in situ Fourier transform infrared spectroscopy.The incorporation of Fe into ZrO2 lattice favored and effectively stabilized the formation of purely ZrO2 tetragonal phase.Subsequently,the catalytic activity of the Fe-doped ZrO2 compounds was evaluated toward vapor phase methylation of phenol.The catalytic activity was governed by Fe content and related to the Lewis acidity of the prepared catalyst.
文摘Expansion graphite (EG) processing of an expanded volume of 400 mL/g was prepared with 50 mesh crude graphite after chemical oxidation intercalation of potassium permanganate and vitriol, and its adsorption kinetics and thermodynamics characteristics for xylenol orange (XO) was investigated. In thermodynamic study, adsorption isotherm and free energy change (⊿G°) were detected and calculated, respectively. Influence of ionic strength on adsorbance was investigated. Kinetic studies were carried out with a series of XO concentration under different temperatures, and the data were simulated with pseudo first-order and second-order kinetic model, respectively. Results illustrate: adsorption of EG for XO is a spontaneous process, and adsorption isotherm is type II;equilibrium adsorbance increases with the increase of ionic strength. Kinetic studies show that the kinetic data can be delineated by pseudo second-order kinetic model. Initial adsorption rate increases with the increase of temperature. Adsorption activation energy is less than 20 kJ/mol;physical adsorption is the major mode of the overall adsorption process.
基金funded by the National Natural Science Foundation of China(No.21804083)Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2018258)。
文摘A dual-readout sensing platform based on two signal transduction channels can integrate the unique advantages of each sensing pattern,compensate for the deficiency in the adaptive capacity,and enable a more convincing performance in analytical applications.Here,we introduce a responsive molecule dye,xylenol orange(XO),to combine with lanthanide terbium ions(Tb^(3+)).The resultant Tb^(3+)-XO complex exhibited tunable optical properties and was used as a novel colorimetric and luminometric dual-readout sensing platform for assaying the anthrax biomarker,dipicolinic acid(DPA).In the presence of Tb^(3+),the XO solution underwent a color change from yellow to magenta;however,upon adding DPA,the color changed back to yellow immediately,accompanied by the characteristic luminescence emission of Tb^(3+).Considering the strong affinity between DPA/XO and metal ions,the proposed sensing platform was further employed for the determination and differentiation of certain metal ions using linear discriminant analysis.This convenient dual-readout sensing platform offers several notable features and significantly promotes the application and development of lanthanide-based materials.
