Self-assembly synthesis,crystal structure and nonlinear optical properties of cluster compound containing PPh2Py ligand

Self-assembly cluster compound [WS4Cu3（PPh2Py）3Br]2·CH3OH （1） was synthesized by the reaction of （NH4）2WS4, CuBr and diphenyl-2-pyridyl-phosphine （PPhzPy） in CH3OH solution under a purified nitrogen atmosphere using standard Schlenk techniques. Its structure was determined by X-ray crystallography. It crystallizes in the triclinic crystal system P-1 space group with a=1.178 6 （1） nm, b=1.302 6 （1） nm, c=1.991 7 （2） nm, α=74.671 （7）°, β=86.188 （8）°, γ=64.141 （6）°, V=2.649 5 （5） nm^3, Z=I. The W center is slightly distorted from tetrahedral coordination geometry, and the structure is built up from three [Cu（PPhzPy）]^＋ units bridged by WS4^2- multifunctional ligand to form a tetranuclear symmetrical cube-like molecule. Measurement of the nonlinear optical （NLO） properties using the Z-scan technique with an 8 ns pulsed laser at 532 nm shows that the compound possesses NLO absorption and effective self-focusing effect at α2=6.7 × 10^-11 m/W and n2=5.64 × 10^-18 mZ/W in a 1.5 × 10^-4 mol/L DMF solution.     

可见光活性MIL金属有机框架的制备及其光催化性能研究

采用溶剂热合成法合成了八种Mofs光催化材料.以La、Zr、Fe、Zn为金属中心,对苯二甲酸(H2BDC)、2-氨基对苯二甲酸(H2ATA)为有机配体.通过XRD、SEM、TEM、Uv-vis DRS、FTIR、莫特肖特基测试对光催化剂进行表征,考察了光催化剂的组成、晶型、形貌、禁带宽度、元素含量、氧化还原电势等性能,考察了可见光和紫外光辐照下光催化剂对苯酚的光催化氧化性能.结果 表明,使用10 mg的H2ATA-La在可见光照下降解20 mg/L的苯酚溶液,8h时降解率达97.45％.     

TiO2/ITO膜的液相沉积法制备及其用于4-氨基安替比林降解的光电催化活性

利用液相沉积（LPD）法在ITO表面制备TiO2薄膜。光电流和交流阻抗（EIS）测试表明,这种TiO2/ITO液相沉积膜具有良好的光电性能,对紫外光产生灵敏、快速的电流响应,在此膜电极上通过施加一定的阳极偏压可有效分离光生电子-空穴对。将TiO2/ITO膜用于4-氨基安替比林的光电催化降解研究,与其他方法相比,利用此液相沉积膜电极的光电催化技术对于4-氨基安替比林的降解具有明显的协同效果,适合于该污染物的降解处理。当外加阳极偏压为＋0.8 V,支持电解质Na2SO4浓度为0.1 mol/L,溶液pH为2.0时,0.1 mmol/L 4-氨基安替比林120 min的光电催化降解效率最高可达95%。     

TiO2光催化活性向可见光区拓展的研究进展

TiO2光催化剂可用于光分解有机污染物,组装太阳能电池,光分解水制氢气或氧气等领域。本文对可见光响应的TiO2光催化剂国内外研究进行了综述,概述了采用敏化,掺杂等方法可使二氧化钛光催化活性从紫外光区拓展到可见光区,并对未来的研究方向进行了展望。     

可见光活性MIL金属有机框架的制备及其光催化性能研究

采用溶剂热合成法合成了八种Mofs光催化材料.以La、Zr、Fe、Zn为金属中心,对苯二甲酸(H2BDC)、2-氨基对苯二甲酸(H2ATA)为有机配体.通过XRD、SEM、TEM、Uv-vis DRS、FTIR、莫特肖特基测试对光催化剂进行表征,考察了光催化剂的组成、晶型、形貌、禁带宽度、元素含量、氧化还原电势等性能,考察了可见光和紫外光辐照下光催化剂对苯酚的光催化氧化性能.结果 表明,使用10 mg的H2ATA-La在可见光照下降解20 mg/L的苯酚溶液,8h时降解率达97.45％.     

Modification of waste fluorgypsum and its applications as a cement retarder

The waste fluorgypsum was modified and applied as a cement retarder. The main chemical composition and mineral structure of the waste fluorgypsum were analyzed. Scanning electron microscopy (SEM) and eight-channel micro-calorimeter (TAM Air) were employed to analyze the changes in morphology and study the application performance of the modified fluorgypsum, respectively. Experimental results indicate that the flexural strength and compressive strength of the modified fluorgypsum are roughly equal to those of the natural gypsum. The morphology of the crystal of the fluorgypsum changes from block particle into trimetric short column. The fluorgypsum crystals stagger mutually and improve the strength of the hardened body. The modified fluorgypsum as cement retarder could delay the hydration, reduce the heat of the hydration and make the setting time, volume stability, and the SO3 content of the cement meet the national standards. The modified fluorgypsum is a good substitute for the natural gypsum.     

基于氧化石墨烯修饰的DNA生物传感器用于苯酚的检测

作为一种典型的优先控制污染物,苯酚一直是环境监测和污染控制的重要对象。基于氧化石墨烯大的比表面积、优良的电子传导性等特性,以其为桥梁,为DNA在玻碳电极上的固定提供了可能,并加大了DNA在电极上的电化学响应信号,由此而构建了一种性能优良的DNA生物传感器。将该传感器浸在含有苯酚的溶液中,由于苯酚对DNA的损伤作用,降低了DNA在电极上的电化学响应。实验发现,响应信号与苯酚的浓度对数呈现良好的线性关系,响应范围为1.0×10-8～1.0×10-4mol/L,此外,该生物传感器表现出良好的稳定性和重现性。     

Preparation, characterization and photo-catalytic behavior of WO3-TiO2 catalysts with oxygen vacancies

TiO₂ photocatalysts compounded with WO₃ were prepared via a modified hydrolysis process and the 2% WO₃-TiO₂ catalysts with different oxygen vacancies were obtained by calcination at 873 K in H₂ atmosphere. The catalysts were identified using X-ray diffractometry (XRD), specific surface measurement (BET), electron paramagnetic resonance spectroscopy (EPR), UV-Vis diffusion refraction spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of 2% WO₃-TiO₂ with different oxygen vacancies was investigated employing splitting of water for O₂ evolution. The results indicate that appropriate oxygen vacancies can obviously improve the photocatalytic activity of 2% WO₃-TiO₂ catalysts, and using Fe³⁺ as an electron acceptor under UV irradiation in 12 h, the maximum rate for O₂ evolution is 667 µmol/(L·h).