废旧隔膜衍生碳负极的电化学储锂性能

以废隔膜为前体,通过一步热解碳化制备碳负极材料,考察了温度和时间对碳化产物的影响,并研究了碳负极材料的电化学储锂性能。结果表明,废隔膜的最佳碳化温度为420℃,碳化时间为120 min;用作锂离子电池负极材料时,在50 m A/g低电流密度充/放电时的可逆放电比容量高达543. 8 m Ah/g;即使在高电流密度2000 m A/g循环1000圈后,可逆放电比容量仍可稳定在125. 0 m Ah/g左右,表现了良好的电化学储锂性能。该研究结果不仅有助于缓解废旧隔膜对环境产生的危害,而且能充分发挥废弃资源中的利用价值、降低电极材料的制备成本。     

不同晶体结构Gd2(MoO4)3:Eu3+荧光粉的合成及其发光性能研究

采用溶胶凝胶-燃烧法,柠檬酸为络合剂合成出系列Gd₂(MoO₄)₃:Eu³⁺荧光粉.利用X射线衍射(XRD)、扫描电子显微镜(SEM)和荧光光谱对样品的结构、形貌和发光性能进行了研究.XRD分析表明:稀土离子与柠檬酸为1:0.5时,800℃热处理获得单斜结构的Gd₂(MoO₄)₃:Eu³⁺荧光粉.单斜结构的Gd₂(MoO₄)₃:Eu³⁺荧光粉到正交结构的Gd₂(MoO₄)₃:Eu³⁺荧光粉的转换可以通过改变稀土离子与柠檬酸摩尔比和热处理温度等合成条件实现.Gd₂(MoO₄)₃:Eu³⁺荧光粉的形貌受合成条件的影响.荧光光谱研究表明:Gd₂(MoO₄)₃:Eu³⁺荧光粉的主发射峰位于616 nm处来自于Eu³⁺的⁵D₀→⁷F₂电偶极跃迁.正交结构的Gd₂(MoO₄)₃:Eu³⁺荧光粉发射强度明显高于单斜结构的荧光粉.计算⁵D₀→⁷F₂与⁵D₀→⁷F₁跃迁发射的相对强度比值表明:正交结构的Gd₂(MoO₄)₃:Eu³⁺中Eu³⁺局域环境的对称性较高。     

煤油浮选硅片切割废砂浆中碳化硅的作用机理研究

通过溶液的气液表面张力测定表明煤油浮选效果优于柴油,因此以煤油做捕收剂,采用泡沫浮选方法回收硅片切割废砂浆中的碳化硅.研究了捕收剂浓度及pH值对分离效果的影响.利用解吸实验和浮选前后物质的红外光谱分析确定出煤油和碳化硅的吸附形式主要为物理吸附.     

An LC‐MS/MS method for simultaneous determination of cefprozil diastereomers in human plasma and its application for the bioequivalence study of two cefprozil tablets in healthy Chinese volunteers

A rapid and sensitive liquid chromatography–tandem mass spectrometric method was developed for the first time and validated for the determination of cefprozil diastereomers in human plasma. The plasma samples were prepared by protein precipitation using acetonitrile. Detection was performed using an electronic spray ion source in the negative ion mode, operating in the multiple reaction monitoring of the transitions m/z 388.0 to m/z 205.0 for cefprozil diastereomers and m/z 346.1 to m/z 268.1 for cephalexin (the internal standard). The calibration curves of cis‐cefprozil and trans‐cefprozil were linear in the ranges 0.125–16.0 µg/mL and 0.0403–1.72 µg/mL, respectively. The lower limits of quantification of cis‐ and trans‐cefprozil were 0.125 and 0.0403 µg/mL in human plasma, respectively. The intra‐ and inter‐day precisions of cis‐ and trans‐cefprozil were all <9.7%, and the accuracy ranged from 99.2 to 104.7% and from 100.6 to 102.2%, respectively. The validated method was successfully applied to a bioequivalence study of two cefprozil formulations in 24 healthy Chinese volunteers. The two cefprozil tablets were bioequivalent by measurement of cis‐, trans‐ and total cefprozil. We suggest that the bioequivalence of cefprozil formulations can be evaluated only using cis‐cefprozil as the analyte in future studies. Copyright © 2015 John Wiley & Sons, Ltd.     

SrTiO3表面O2,H2O吸附的UPS,XPS研究

观察到还原SrTiO₃表面三价Ti离子引起的表面态的存在。分析了它在太阳光分解水中所起作用,以及光照在恢复活性中的作用。 关键词：     

整形种子脉冲克服放大过程中增益窄化效应的研究

对飞秒脉冲放大中通过整形种子脉冲光谱补偿增益窄化效应的过程进行了数值模拟;对比研究了普通种子脉冲放大过程和整形种子脉冲放大过程中的光谱增益特性;定义了带宽窄化率;讨论了初始啁啾量对注入种子脉冲及增益窄化效应的影响.计算结果表明：借助整形种子光谱可理想地补偿啁啾脉冲放大中的光谱窄化效应. 关键词：     

激光测距机主要参数校准测量不确定度分析

简述激光测距机主要参数校准装置的组成，通过对其主要参数(最大测程、最小测程、测距准确度、重复频率、束散角)的校准测量进行详细的不确定度分析，评价激光测距机主要参数校准装置的达标程度。     

BiOI负载MIL-101(Fe)@BiOI衍生BiFeO3@Fe2O3及其增强光催化性能

采用溶剂热法合成了MIL-101(Fe)@BiOI复合材料,然后将其煅烧制备光催化性能增强的BiFeO₃@Fe₂O₃@BiOI三元复合材料。采用X射线衍射、扫描电镜、紫外可见漫反射吸收光谱等测试手段表征复合材料的组成、结构、形貌。将复合材料用于可见光照射下光催化降解四环素,研究复合比例(质量比)、pH和浓度对光催化性能的影响。电化学阻抗谱、光电流响应和莫特-肖特基曲线测试分析表明三元复合材料BiFeO₃@Fe₂O₃@BiOI表现出更强的光电流响应和更低的电荷转移电阻。当BiFeO₃、Fe₂O₃和BiOI三者理论质量比为1∶1∶1时,中性条件下降解活性最高,四环素去除率为81%。     

NF3 decomposition over some metal oxides in the absence of water

NF3 decomposition in the absence of water over Al2O3, Fe2O3, Co3O4 and NiO, and transition metal oxides (Fe2O3, Co3O4 and NiO) coated Al2O3 reagents was investigated. The results show that Al2O3 is an active reagent for NF3 decomposition with 100% conversion lasting for 8.5 h at 400 ℃. Fe2O3, Co3O4 and NiO coated Al2O3 reagents are superior to bare Al2O3, and 5%Co3O4/Al2O3 has a high reactivity with NF3 full conversion maintaining for 10.5 h. It is suggested that the presence of transition metal oxide is beneficial to the reactivity of Al2O3, and results in a significant enhancement in the fluorination of Al2O3.     

Photoinduced Oxidation Reaction of Benzotrifluoride with OH Radical by the Laser Flash Method

The optical transient and kinetics characterizations of the transients formed in the reaction of OH with benzotrifluoride (BTF) were performed by a laser flash photolysis technique. The results indicated that the formation of π‐type adduct of C₆H₅(OH)CF₃ was the major reaction channel, and the δ‐type adduct of C₆H₅CF₃OH formation was an additional minor process in the oxidation reaction of BTF attacked by OH radicals yielded from the photolysis of H₂O₂. Addition of OH to the CF₃ group led to the fluoride ion elimination to yield α,α‐difluorophenylcarbinol (C₆H₅CF₂OH). Trifluoromethylphenol (HOC₆H₄CF₃) of meta‐, para‐ and ortho‐substituted isomers resulted from the addition of OH to the BTF aromatic ring.