Synthesis and Characterization of Co-Doped Brookite Titania Photocatalysts with High Photocatalytic Activity

Transition metal-doping could effectively extend the light response range of TiO _2 photocatalysts from the ultraviolet(UV)to the visible region.Co-doped brookite titanium dioxide(Co–TiO_2)photocatalysts were synthesized via the hydrothermal method with titanium tetrachloride as the raw material and cobalt chloride hexahydrate as the dopant.The prepared Co–TiO_2 photocatalysts were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman spectroscopy,X-ray photoelectron spectroscopy(XPS)and UV–Vis diffuse reflectance spectroscopy(UV–Vis DRS).The photocatalytic activities of Co–TiO _2 photocatalysts were evaluated by photocatalytic degradation of isopropanol alcohol(IPA),a typical volatile organic compound(VOC),under visible light.The influences ofdifferent Co doping rates,initial concentrations of IPA gas and the amounts of photocatalyst addition were also studied.At the same time,the enhancement mechanism ofcobalt ions as a trap for photogenerated holes was discussed.Thus,we found the optimum doping rate,initial concentration of IPA gas and amount of photocatalyst to add.The results show that the mesoporous Co–TiO _2 photocatalysts possess smaller size particles,larger specific surface area,lower forbidden bandgap energy(Eg)and better photocatalytic activity than pure brookite TiO _2.When the doping of Co was 7% by mass,the initial concentration ofIPA gas was 1.0×10~(-6 )mol/L and the addition of Co–TiO_2 photocatalysts was 50 mg,the best photocatalytic activity was achieved.Furthermore,the degradation rate ofIPA was up to 91%,which shows great potential for waste water treatment.     

合成低碳醇铜钴催化剂的TEM与TPR表征

用电子显微镜(TEM)和程序升温仪(TPR)分别对加钾(K)前后的共沉淀铜钴催化剂[m(Cu)/m(Co)=0.358g]进行了TEM和TPR表征.从TPR图上发现,催化剂加K后,催化剂的还原性受到抑制,导致加K后催化剂活性下降;另外从TEM图上得知,加钾后催化剂的粒径增大,也导致加钾后催化剂活性下降,因此催化剂中钾的加入量应适宜.     

Microstructure and creep properties of high Cr resisting weld metal alloyed with Co

A 9% Cr ferritic steel weld metal containing 1% Co, partially substituted for nickel, was prepared by submerged arc welding (SAW) processing. The microstructure and creep properties of the weld metal were investigated. The microstructure exhibited a fully tempered martensitic structure free of δ-ferrite. The creep properties of the obtained weld metal were inferior to those of the P92 base metal at 600 and 650 °C. The values of A and n for weld metal in the Norton power law constitution at 650 °C are 1.1×10?21 and 8.1, respectively.     

催化动力学光度法测定痕量钴

研究了 Na HCO3 Na2 CO3介质中 Co( )催化过氧化氢氧化钙镁试剂褪色反应的动力学条件 ,建立了测定痕量 Co( )的新方法 ,用于样品中痕量 Co( )的测定 ,结果准确可靠     

快乐时刻

PLUS of MINUS?加还是减? Print plus or minus signs in the empty boxes to arrive at the given answers．(请给以下方框里的两条等式添上加号或减号,使等式两边成立。) Print the names of the two things pictured in numbers 1 and 2． (请写出图1和图2中物品的英文名称。)     

Co/Pt多层膜的铁磁共振研究

Out-of-plane angular dependence of ferromagnetic resonance spectra was measured in sputtered Co/Pt multilayers and analyzed with the Landau-Lifshitz-Gilbert equation. The effective demagnetizing field 4πMeff is found to increase with decreasing tPt and decreasing 1/tco, which can be considered as a result of interplay between the interlayer coupling and a lowdimensional effect. The g factor increases with increasing tpt and decreasing tCo, indicating contribution of spin-polarization of Pt atoms and additional contribution of orbital moment of Co atoms. The in-plane resonance line-width increases with decreasing too and increases with increasing tPt.     

Co(NH3)6Cl3中钴含量的测定

探讨了在酸性介质中用H2O2或盐酸羟胺做还原剂,把Co(Ⅲ)还原为Co(Ⅱ),采用配位滴定法测定配合物Co(NH3)6Cl3中的钴含量可获得满意的效果.     

The Electrochemical Performance of Ml0.7Mm0.3Ni3.7Co0.7Mn0.4Al0.2 Nanocrystalline Hydrogen Storage Alloy as Metal Hydride Electrode

Ml0.7Mm0.3Ni3.7Co0.7Mn0.4Al0.2 nanocrystalline hydrogen storage materials are prepared by melt-spinning(MS).X-ray diffraction is used for the measurement of the nanocrystalline size.Compared to the electrode of polycrystalline alloys,the property of activation MH9metal hydride)electrode of the alloys with nanometer scale became worse and the inital discharge capacity decreased.It may be ascribed to the decrease of the total amount of rare earth metals and the increase of oxygen on the surface from the analysis of components of the alloys.After heat-treatment,the electrochemical performance of MH electrode of as-spun alloys could be improved,which could be attributed to the alleviation of the lattice strain.     

两种Co(Ⅲ)配合物键合异构体的制备及结构分析

本文通过条件选择合成两种Co(Ⅲ)配合物键合异构体[Co(NH3)5NO2]Cl2(配合物1)与[Co(NH3)5ONO]Cl2(配合物2),通过红外光谱、紫外光谱对配合物进行表征。确立两种键合异构体可能的结构。     

Co与Nd共掺杂锶铁氧体SrFe_(12)O_(19)的电子及磁性性质的第一性原理计算

利用基于密度泛函理论的第一性原理方法对未掺杂的锶铁氧体SrFe_(12)O_(19)、Co掺杂SrFe_(12)O_(19)及Co与Nd共掺杂SrFe_(12)O_(19)的晶体结构、电子性质及磁性性质进行了计算.结果表明:未掺杂的SrFe_(12)O_(19)晶体为半导体,体系中Fe原子表现为高自旋态,2a、2b、12k晶位Fe原子的磁矩与4f1、4f2晶位Fe原子的磁矩反平行排列,总磁矩为40μB;Co掺杂SrFe_(12)O_(19)后体系表现出金属性,Co与Fe原子均表现出高自旋态,Co原子磁矩为2.5μB,Fe原子磁矩为3.58μB,总磁矩为34μB;Co与Nd共掺杂SrFe_(12)O_(19)后Fe原子表现为高自旋态,磁矩为3.55μB,Nd原子被局域为高自旋态,磁矩为3μB,Co原子表现为低自旋态,体系总磁矩为62μB,掺杂后体系磁性明显增强.