Magnetic a-Fe2O3, γ-Fe2O3 and Fe3O4 were prepared by facile calcination under different temperature from K4[Fe（CN）6] as raw materials, in which the calcined products are a-Fe2O3, Fe3O4 and y-Fe203 at 400 or 700, 50...Magnetic a-Fe2O3, γ-Fe2O3 and Fe3O4 were prepared by facile calcination under different temperature from K4[Fe（CN）6] as raw materials, in which the calcined products are a-Fe2O3, Fe3O4 and y-Fe203 at 400 or 700, 500, and 600 ℃, respectively. The as-prepared compounds were characterized by X-ray powder diffraction and scanning electron microscopy, and their magnetic behavior at room temperature was also studied. This method provided a simple approach to prepare different polymorphic forms of magnetic iron oxides, which may have potential applications in magnetic science, magnetic composite materials, magnetic core, magnetic separation and medical diagnostics.展开更多
The plane-wave pseudopotential function method, based on density-functional theory, has been used to calculate the adsorption, electronic band structures, orbitals and optical absorption spectrum of [Fe（CN）6]^4- on ...The plane-wave pseudopotential function method, based on density-functional theory, has been used to calculate the adsorption, electronic band structures, orbitals and optical absorption spectrum of [Fe（CN）6]^4- on TiOz anatase（101） surface. Our calculations reveal that the surface-modified anatase system has large adsorption energy and a much narrower band gap. [Fe（CN）6]^4- adsorption on the （101） surface could lead to a large red shift of the anatase optical absorption threshold, which extends into a visible region significantly. The calculated results are in agreement with the experiment and other theoretical studies reasonably. It is very important for the understanding and further development ofphotovoltaic materials that are active under visible light.展开更多
Cyclic voltammetry and in situ microscopic FTIR spectroelectrochemistry were used for the electrochemical and vibrational characterizations of the reduction process of K 3Fe(CN) 6 in polyethylene glycol(PEG) wi...Cyclic voltammetry and in situ microscopic FTIR spectroelectrochemistry were used for the electrochemical and vibrational characterizations of the reduction process of K 3Fe(CN) 6 in polyethylene glycol(PEG) with LiClO 4 as supporting electrolyte at a Pt microelectrode. The rate of electron transfer is a function of the concentration of the supporting electrolyte. The redox potentials and cyclic voltammetric currents vary with Li/O molar ratio. The in situ spectroelectrochemistry shows that the infrared spectra are influenced by the concentration of LiClO 4. The bridging cyanide groups with a structure Fe Ⅱ—C≡N…Fe Ⅱ—C≡N are formed during the reduction process of K 3Fe(CN) 6. There may be an activated complex between the Li + cation and the complex anion.展开更多
首次将光电化学(PEC)传感应用于[Fe(CN)6]4-检测.合成了光电转换效率较高的TGA-Cd S QDs,并将Cd S QDs/Ti O2/ITO传感电极应用于食盐中抗结剂亚铁氰化钾的检测.实验结果表明:在最优条件下,该方法的线性范围为1.0~12.0μmol/L,线性方程为...首次将光电化学(PEC)传感应用于[Fe(CN)6]4-检测.合成了光电转换效率较高的TGA-Cd S QDs,并将Cd S QDs/Ti O2/ITO传感电极应用于食盐中抗结剂亚铁氰化钾的检测.实验结果表明:在最优条件下,该方法的线性范围为1.0~12.0μmol/L,线性方程为y=4.858x+31.46,相关系数R2=0.998 4,检测限为0.26μmol/L(S/σ=3,σ为10次空白试验的标准偏差).PEC传感策略在检测[Fe(CN)6]4-时,实验方法简单、成本低且检测效率高.展开更多
基金supported by the Funds of Fujian province department of education(No.JA14199)
文摘Magnetic a-Fe2O3, γ-Fe2O3 and Fe3O4 were prepared by facile calcination under different temperature from K4[Fe（CN）6] as raw materials, in which the calcined products are a-Fe2O3, Fe3O4 and y-Fe203 at 400 or 700, 500, and 600 ℃, respectively. The as-prepared compounds were characterized by X-ray powder diffraction and scanning electron microscopy, and their magnetic behavior at room temperature was also studied. This method provided a simple approach to prepare different polymorphic forms of magnetic iron oxides, which may have potential applications in magnetic science, magnetic composite materials, magnetic core, magnetic separation and medical diagnostics.
基金the Scientific and Technology Foundation of Fuzhou University and the Key Project of Fujian Province (2005HZ01-2-6)
文摘The plane-wave pseudopotential function method, based on density-functional theory, has been used to calculate the adsorption, electronic band structures, orbitals and optical absorption spectrum of [Fe（CN）6]^4- on TiOz anatase（101） surface. Our calculations reveal that the surface-modified anatase system has large adsorption energy and a much narrower band gap. [Fe（CN）6]^4- adsorption on the （101） surface could lead to a large red shift of the anatase optical absorption threshold, which extends into a visible region significantly. The calculated results are in agreement with the experiment and other theoretical studies reasonably. It is very important for the understanding and further development ofphotovoltaic materials that are active under visible light.
文摘Cyclic voltammetry and in situ microscopic FTIR spectroelectrochemistry were used for the electrochemical and vibrational characterizations of the reduction process of K 3Fe(CN) 6 in polyethylene glycol(PEG) with LiClO 4 as supporting electrolyte at a Pt microelectrode. The rate of electron transfer is a function of the concentration of the supporting electrolyte. The redox potentials and cyclic voltammetric currents vary with Li/O molar ratio. The in situ spectroelectrochemistry shows that the infrared spectra are influenced by the concentration of LiClO 4. The bridging cyanide groups with a structure Fe Ⅱ—C≡N…Fe Ⅱ—C≡N are formed during the reduction process of K 3Fe(CN) 6. There may be an activated complex between the Li + cation and the complex anion.
文摘首次将光电化学(PEC)传感应用于[Fe(CN)6]4-检测.合成了光电转换效率较高的TGA-Cd S QDs,并将Cd S QDs/Ti O2/ITO传感电极应用于食盐中抗结剂亚铁氰化钾的检测.实验结果表明:在最优条件下,该方法的线性范围为1.0~12.0μmol/L,线性方程为y=4.858x+31.46,相关系数R2=0.998 4,检测限为0.26μmol/L(S/σ=3,σ为10次空白试验的标准偏差).PEC传感策略在检测[Fe(CN)6]4-时,实验方法简单、成本低且检测效率高.
