气相色谱法测定粗生物柴油中甲醇含量

建立了测定粗生物柴油中甲醇含量的气相色谱法。粗生物柴油中的甲醇经石英毛细管柱分离后,用氢火焰离子检测器进行测定。实验结果表明,甲醇溶液的浓度(m/m)在0.500%~10.000%范围内呈良好的线性关系,相关系数r>0.9999,该方法检出限为0.007%。对实际样品进行测定,相对标准偏差在0.64%~1.31%(n=7),加标回收率在96.8%~102.1%。该方法操作简便,灵敏度高,精密度好,结果准确,对仪器系统污染小,适用于粗生物柴油中甲醇含量的测定。

CoNi_2S_4 Microspheres Prepared by One-pot Hydrothermal Reaction as Supercapacitor

A microsphere discrete structure of CoNi_2S_4 was prepared through one-pot hydrothermal reaction and characterized by FTIR, XRD and SEM. The as-prepared CoNi_2S_4 served as a supercapacitor, showing a specific capacitance of 1129.5 F/g with over 99% coulombic efficiency at a current density of 4 A/g in 3 M KOH. And after 3000 cycles of charge and discharge tests, 92.3% of its initial capacitance can be still maintained. The results demonstrate that the material is promising as an electrode material for supercapacitors in energy storage.

Hydrothermal Synthesis of Polyoxovanadate-based MOFs Microsphere as Supercapacitor

Polyoxovanadate-based MOFs microsphere electrode material, [Ni_2(4,4?-bipyridine)_3(H_2O)_2V_4O_(12)]·2.5 H_2O, was synthesized through a simple hydrothermal method, and then characterized through FT-IR, XRD and SEM. Electrochemical properties of the sample as supercapacitor electrodes in aqueous electrolyte were developed and studied by cyclic voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy techniques. Results showed that a high specific capacitance of 152.36 F g^(-1) at current density of 1 A g^(-1) in 2 M KOH electrolyte, and 97.62% retention after 2500 charge-discharge cycles at current density of 4 A g^(-1), which is promising for applications in supercapacitors.

2-氨基对苯二甲酸荧光传感器检测Fe^(3+)

以环保易得的2-氨基对苯二甲酸作为荧光探针检测Fe^(3+),用荧光分光光度计进行荧光检测实验.研究发现,2-氨基对苯二甲酸与Fe^(3+)能发生荧光猝灭反应,并对Fe^(3+)的检测具有较好的选择性、抗干扰性、灵敏性,其线性方程为F/F_0=1.000 73-0.006 76C[Fe^(3+)],相关系数R^2=0.995 47,检测范围是0～120μmol/L,检测限为5μmol/L.用傅立叶变换红外光谱仪表征该荧光探针,探究其对Fe^(3+)检测的机理.

Facile Synthesis and Properties of UiO-66 Electrode Material for Supercapacitors

A block-like metal-organic framework UiO-66 was prepared by in-situ growth one-pot hydrothermal process.The as-synthesized material was characterized by Fourier transform infrared spectroscopy,X-ray diffraction and scanning electron microscopy.The electrochemical properties used as a supercapacitor electrode material were evaluated by cyclic voltammetry(CV),galvanostatic charge-discharge measurement(GCD)and electrochemical impedance spectroscopy(EIS)in 2 M KOH solution,exhibiting a high specific capacitance(311 F·g^-1 at 1 A·g^-1),suggesting its promising potential as a supercapacitor electrode material.