Carbon nanotubes / magnesium oxysulfates (MOS) nanocomposite was prepared under different hydrothermal conditions. The samples were characterized by SEM, TEM, XRD and TG. The results showed that carbon nanotubes and t...Carbon nanotubes / magnesium oxysulfates (MOS) nanocomposite was prepared under different hydrothermal conditions. The samples were characterized by SEM, TEM, XRD and TG. The results showed that carbon nanotubes and the magnesium oxysulfates could form nanocomposite under the hydrothermal reaction and the morphology of the MOS compound coated on the carbon nanotubes varied with different reaction conditions.展开更多
The quantitative relationship between the structure of oxime-ether compounds containing sulfur(oxygen) and their insecticidal activity against leafhopper was studied by comparative molecular field analysis(CoMFA). The...The quantitative relationship between the structure of oxime-ether compounds containing sulfur(oxygen) and their insecticidal activity against leafhopper was studied by comparative molecular field analysis(CoMFA). The results showed that the contributions of steric and electrostatic fields to the activity were 47.5% and 52.5%, respectively. The coefficient q2 of cross validation and the relation coefficient r2 of non-cross validation for the model established by the study were 0.628 and 0.971, respectively, its F value was 133.840 and the standard deviation was 0.109. These values indicated that the model might have a good predictability. The contour maps of the model will give the basis on the structure modification.展开更多
A series of functional,tungsten-containing mesoporous silica materials（W-SiO2） have been fabricated directly from an ionic liquid that contained imidazole and polyoxometalate,which acted as mesoporous template and m...A series of functional,tungsten-containing mesoporous silica materials（W-SiO2） have been fabricated directly from an ionic liquid that contained imidazole and polyoxometalate,which acted as mesoporous template and metal source respectively.These materials were then characterized through X-ray diffraction（XRD）,transmission electron microscopy（TEM）,Raman spectroscopy,Fourier transform infrared spectra（FTIR）,diffuse reflectance spectra（DRS）,and N2 adsorption-desorption,which were found to contain tungsten species that were effectively dispersed throughout the structure.The as-prepared materials W-SiO2 were also found to possess a mesoporous structure.The pore diameters of the respective sample W-SiO2-20 determined from the TEM images ranged from 2 to 4 nm,which was close to the average pore size determined from the nitrogen desorption isotherm（2.9 nm）.The materials were evaluated as catalysts for the heterogeneous oxidative desulfurization of dibenzothiophene（DBT）,which is able to achieve deep desulfurization within 40 min under the optimal conditions（Catalyst（W-SiO2-20）= 0.01 g,temperature = 60℃,oxidant（H2O2）= 20 μL）.For the removal of different organic sulfur compounds within oil,the ability of the catalyst（W-SiO2-20） under the same conditions to remove sulfur compounds decreased in the order：4,6-dimethyldibenzothiophene Dibenzothiophene Benzothiophene 1-dodecanethiol.Additionally,they did not require organic solvents as an extractant in the heterogeneous oxidative desulfurization process.After seven separate catalytic cycles,the desulfurization efficiency was still as high as 90.3%.From the gas chromatography-mass spectrometer analysis,DBT was entirely oxidized to its corresponding sulfone DBTO2 after reaction.A mechanism for the heterogeneous desulfurization reaction was proposed.展开更多
In this paper,the forming and transforming process of the magnesium oxysulfates in a quaternary interaction system of MgSO 4 -NaOH-H 2 O under the hydrothermal conditions at 180℃has been investigated by usin g MgSO 4...In this paper,the forming and transforming process of the magnesium oxysulfates in a quaternary interaction system of MgSO 4 -NaOH-H 2 O under the hydrothermal conditions at 180℃has been investigated by usin g MgSO 4 and NaOH solutions as starting materials.This transforming process of prod uct phase from unstable phase to stab le phase with time has been proved by means of c hemical analysis,microphotograph,XRD and IR.展开更多
文摘Carbon nanotubes / magnesium oxysulfates (MOS) nanocomposite was prepared under different hydrothermal conditions. The samples were characterized by SEM, TEM, XRD and TG. The results showed that carbon nanotubes and the magnesium oxysulfates could form nanocomposite under the hydrothermal reaction and the morphology of the MOS compound coated on the carbon nanotubes varied with different reaction conditions.
文摘The quantitative relationship between the structure of oxime-ether compounds containing sulfur(oxygen) and their insecticidal activity against leafhopper was studied by comparative molecular field analysis(CoMFA). The results showed that the contributions of steric and electrostatic fields to the activity were 47.5% and 52.5%, respectively. The coefficient q2 of cross validation and the relation coefficient r2 of non-cross validation for the model established by the study were 0.628 and 0.971, respectively, its F value was 133.840 and the standard deviation was 0.109. These values indicated that the model might have a good predictability. The contour maps of the model will give the basis on the structure modification.
基金supported by the National Nature Science Foundation of China(21276117,21376111,21406092)~~
文摘A series of functional,tungsten-containing mesoporous silica materials（W-SiO2） have been fabricated directly from an ionic liquid that contained imidazole and polyoxometalate,which acted as mesoporous template and metal source respectively.These materials were then characterized through X-ray diffraction（XRD）,transmission electron microscopy（TEM）,Raman spectroscopy,Fourier transform infrared spectra（FTIR）,diffuse reflectance spectra（DRS）,and N2 adsorption-desorption,which were found to contain tungsten species that were effectively dispersed throughout the structure.The as-prepared materials W-SiO2 were also found to possess a mesoporous structure.The pore diameters of the respective sample W-SiO2-20 determined from the TEM images ranged from 2 to 4 nm,which was close to the average pore size determined from the nitrogen desorption isotherm（2.9 nm）.The materials were evaluated as catalysts for the heterogeneous oxidative desulfurization of dibenzothiophene（DBT）,which is able to achieve deep desulfurization within 40 min under the optimal conditions（Catalyst（W-SiO2-20）= 0.01 g,temperature = 60℃,oxidant（H2O2）= 20 μL）.For the removal of different organic sulfur compounds within oil,the ability of the catalyst（W-SiO2-20） under the same conditions to remove sulfur compounds decreased in the order：4,6-dimethyldibenzothiophene Dibenzothiophene Benzothiophene 1-dodecanethiol.Additionally,they did not require organic solvents as an extractant in the heterogeneous oxidative desulfurization process.After seven separate catalytic cycles,the desulfurization efficiency was still as high as 90.3%.From the gas chromatography-mass spectrometer analysis,DBT was entirely oxidized to its corresponding sulfone DBTO2 after reaction.A mechanism for the heterogeneous desulfurization reaction was proposed.
文摘利用水热法合成二硫化锡六方晶片,通过氧化聚合包裹聚苯胺,水热还原制备锡氧硫化合物@聚苯胺@还原氧化石墨烯(SnO_(x)S_(y)@PANI@rGO)复合材料.分别利用X射线衍射(X-ray diffraction,XRD)、傅里叶变换红外(Fourier transform infrared,FT-IR)光谱、扫描电子显微镜(scanning electron microscope,SEM)和透射电子显微镜(transmission electron microscope,TEM)对材料进行形貌和物相分析,结果表明:制备的六方形SnO_(x)S_(y)被PANI和rGO双层包覆.将复合材料作为锂离子电池的负极进行电化学性能研究,结果显示:由于多元复合材料中的聚苯胺和还原石墨烯增加了其导电性,缓冲了SnO_(x)S_(y)在充放电过程的体积膨胀,保持了结构稳定性,展现了优越的电性能.
文摘In this paper,the forming and transforming process of the magnesium oxysulfates in a quaternary interaction system of MgSO 4 -NaOH-H 2 O under the hydrothermal conditions at 180℃has been investigated by usin g MgSO 4 and NaOH solutions as starting materials.This transforming process of prod uct phase from unstable phase to stab le phase with time has been proved by means of c hemical analysis,microphotograph,XRD and IR.
