Carbon nanotube assisted synthesis of CeO2 nanotubes

CeO₂ nanotubes have been synthesized facilely using carbon nanotubes (CNTs) as templates by a liquid phase deposition method. The properties of the CeO₂ nanotubes were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS) as well as thermogravimetry and differential thermal analysis (TG-DTA). The obtained CeO₂ nanotubes with a polycrystalline face-centered cubic phase have a uniform diameter ranging from 40 to 50 nm. The CeO₂ nanotubes are composed of many tiny interconnected nanocrystallites of about 10 nm in size. The pretreatment of CNTs and calcination temperature were confirmed to be the crucial factors determining the formation of CeO₂ nanotubes. A possible formation mechanism has been suggested to explain the formation of CeO₂ nanotubes.     

TiO2光电催化水处理技术研究进展

TiO2光电催化水处理是一种电化学辅助的光催化反应技术，通过施加外部偏压减少光生电子和空穴的复合，从而提高其量子效率使有机污染物彻底矿化。本文综述了TiO2光电催化的机理、研究进展，反应器开发、设计、模型化等方面存在的问题及今后深入研究的方向。     

锂离子电池正极材料LiCoO2的微波合成及结构表征

改变原料的Li,Co摩尔配比，利用微波法制备出锂离子电池正极材料LiCoO2，同时考察了微波辐照时间对反应体系温度的影响，并采用电子显微镜、红外光谱和X射线衍射技术对产品的晶体结构进行分析。结果表明，Li,Co的摩尔比的1.05:1时，所合成的LiCoO2晶体纯度高，具有良好的层状结构。与传统合成法相比，微波合成法具有反应时间短，能耗低，合成效率高，颗粒均匀性良好等特点。     

Evaluation of the stability and analysis of halogenated furanones in disinfected drinking waters

A refined method for the sub-nanomolar analysis of 13 halogenated furanones in chlorinated drinking water is proposed which uses liquid-liquid extraction, methylation where necessary, gas chromatographic separation, and either micro-electron capture or ion trap mass spectrometric detection. Liquid-liquid extraction with methyl tert-butyl ether was demonstrated to be effective for recovery of halogenated furanones. Confirmation of the halogenated furanones identity and reduction of natural organic matter interference were achieved by ion trap tandem mass spectrometry. Compound stabilities and procedural efficiencies were evaluated to permit optimization of the method for reasonable sample volumes and a 1000:1 pre-concentration factor that would permit feasible sample collection in the field. Both chlorinated and brominated analogues of MX (3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone) were included in a suite of compounds targeted in a national occurrence study of disinfection by-products.     

3,4—二乙酰基—2,5—己二酮与取代苯胺及水合肼的反应

以乙酰丙酮（１）的电氧化偶联产物３，４－二乙酰基－２，５－己二酮（２）为原料，在酸性介质中与取代苯胺（３ａ￣３ｇ）作用，得到１，４－二羰基的缩合产物２，５－二甲基－３，４－二乙酰基－１－芳基吡咯（４ａ￣４ｇ）。在相似的条件下，２与水合肼作用，则得到１，３－二羰基的缩合产物３，３＇，５，５＇－四甲基－１，１＇－二氢－４，４＇－联吡唑（５）。     

6，6＇－二（二苯基氧化膦甲基）－1，1＇－氮氧化－2，2＇－联吡啶与硝酸铒配合物的合成与结构

合成了硝酸铒与四功能团含磷萃取剂６，６＇－二（二苯基氧化膦甲基）－１，１＇－氮氧化－２，２＇－联吡啶的配合物。用四圆衍射仪测定了配合物的晶体结构。晶体属单斜晶系，空间群Ｃ２／ｃ，晶体学参数，ａ＝１．９８３０（４）ｎｍ，ｂ＝２．３１３５（４）ｎｍ，ｃ＝１．８６００（３）ｎｍ；β＝９６．１８（２）°，ｚ＝４。配合物中有机配体以四齿形式与中心离子铒配位，金属离子的配位数为８。配位几何构形为稍变形的四方反棱柱。金属离子周围的配位水分子已全部被取代。     

喹喔啉—2,3—二甲酰胺与3d过渡金属配合物的合成及性质研究

首次合成了喹喔啉－２，３－二甲酰胺（Ｑｘｄａ）与３ｄ过渡金属的三种固体配合物：Ｍ（Ｑｘｄａ）２ｃｌ２（Ｍ＝Ｃｏ（Ｉ），Ｎｉ（Ｉ），Ｃｕ（Ⅱ）。通过元素分析，摩尔电导，红外光谱，电子光谱，磁化率，热分析等手段对配合物的组成和性质进行了研究。     

Thermodynamics of the dissociation of 2-aminopyridinium ion in synthetic seawater and a standard for pH in marine systems

Buffer solutions composed of 2-aminopyridinium chloride and 2-aminopyridine in synthetic seawater are useful as a supplement to buffers of Tris (pH 8.2) and Bis (pH 8.8) in standardizing measurements of hydrogen ion concentration (pm _H or pH(SWS)) in oceanography. The dissociation constant of 2-amino-pyridinium ion over the range of salinities (S) from 30 to 40 has now been determined from the emf of cells without liquid junction at eight temperatures (T) from 278.15 to 313.15 K. The results fit the equation pK=2498.31/T–15.3274+2.4050 lnT+S(0.012928–2.9417×10^–5T) with a standard deviation of 0.0023. Thermodynamic constants for the dissociation process and standard reference values of pm _H and pH(SWS) were derived from the data. The pm _H of the buffer consisting of 2-aminopyridinium chloride and 2-aminopyridine (each 0.04 molal) in synthetic seawater of salinity 35 varies from 7.356 at 278.15 K to 6.601 at 313.15 K.