MnSO4-CuSO4复合催化剂快速测定COD的研究

探讨了以MnSO4-CuSO4复合催化剂代替标准重铬酸钾法中的Ag2SO4,用H2SO4-H3PO4混酸代替标准重铬酸钾法中的硫酸,测定化学需氧量的最佳条件为:氧化剂K2Cr2O7浓度为0.25 mol/L,混酸H2SO4-H3PO4体积比为4∶1,催化剂MnSO4-CuSO4配比为1∶2,MnSO4与CuSO4的总量为0.03 g,消解温度为165℃,消解时间为15 min,实验相对误差≤5%.     

CODCr测定中催化剂的改进

本文探讨了以NiSO4以及Ag2SO4—NiSO4混合物代替单纯Ag2SO4做催化剂的可能性，经对各种化合物以及不同Ag2SO4—NiSO4混合比测定废水CODCr值的比较，实验表明，用NiSO4或Ag2SO4—NiSO4混合物（重量比0.3:0.1）做催化剂是可行的，并能显著减少贵金属银的用量，降低分析费用。     

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LOGO在库房安全防护系统中的应用

1安全防护系统工作原理 此系统包括3个区、4组轨道控制电路共计4个箱M1-M4、4个门的挡车器分别为门1-门4、4个旋转式警示灯分别为N1—N4、集中控制箱1个为M5,要求列车自西向东运行时：进入（4-3）区时,4号门,该门上声光报警提示库房内有列车通过,任何人不得通过道口及打开该处常闭型防护拦杆（挡车器）;进入（3-2）区时,1、2、3、4号门,     

侧链液晶聚硅氧烷的合成及表征

研究了含有联苯和苯甲醚基团的液晶聚硅氧烷的合成及表征,合成了4-（4-烯丙氧基苯甲氧基）-4′-甲氧基联苯（M₁）,4-（4-烯丙氧基苯甲氧基）-4′-乙氧基联苯（M₂）,4-（4-烯丙氧基苯甲氧基）-4′-丙氧基联苯（M₃）,4-（4-烯丙氧基苯甲氧基）-4′-丁氧基联苯（M₄）,4-（4-烯丙氧基苯甲氧基）-4′-戊氧基联苯（M₅）等五种单体液晶,用硅氢加成法合成了它们的聚硅氧烷接枝聚合物,用示差扫描量热法和偏光显微技术测定了它们的相变化,所有合成的液晶表现出良好的液晶性.     

CeVO4/g-C3N4的制备及其降解盐酸四环素性能

以简单的水热法制备了CeVO4/g-C3N4光催化剂,通过XRD、SEM、TEM、UV-Vis、FT-IR、XPS、PL等检验并分析了所制备复合催化剂样品的复合情况、纯度、形貌等,考察了掺杂0～50％CeVO4的复合光催化剂CeVO4/g-C3N4于模拟可见光下降解盐酸四环素的光催化性能.实验结果表明,以20 mg/L盐酸四环素为降解底物,负载30％CeVO4的CeVO4/g-C3N4样品在模拟可见光下3 h内对目标底物降解效率达90.5％.制备的CeVO4/g-C3N4光催化剂光催化性能优良,相同时间内对盐酸四环素的降解率是纯CeVO4的2倍,是纯g-C3N4的3.7倍.     

浅析对EMS中“适用的法律法规和其他要求”的理解

ISO14001：2004标准的17个条款中有多个直接涉及法律法规和其他要求,如主要的有：4.2环境方针、4．3．1环境因素、4．3．3目标指标方案、4．4．6运行控制、4．5．1监测和测量、4．5．2合规性评价等。     

BiPO_4/g-C_3N_4可见光催化氧化RhB

通过简单的水热和煅烧方法,把BiPO4纳米颗粒植入g-C3N4层间或表面,成功地制备了BiPO4/gC3N4复合光催化剂.通过XRD、SEM、TEM、N2吸附-脱附等温线和UV-VisDRS分析表明,g-C3N4具有明显的层状结构且与BiPO4纳米颗粒形成了复合物,BiPO4/g-C3N4复合光催化剂具有较大的比表面积(172.9m2·g-1),与纯g-C3N4相比扩展了可见光的响应范围.光降解实验结果表明,负载量为2wt%的BiPO4/g-C3N4复合光催化剂具有最高的可见光催化活性,在降解1h后,罗丹明B的降解率可以达到87.5%,催化活性与纯g-C3N4提高了近3倍.     

Na_5Eu(WO_4)_4激光晶体的光谱特性

本文报道了用助熔剂缓冷法生长出长度达 4.5mm的Na_5Eu(WO_4)_4单晶,并对Na_5Eu(WO_4)_4单晶的红外光谱、吸收光谱、荧光光谱、激发光谱和荧光寿命进行了测定,给出了Na_5Eu(WO_4)_4晶体室温下的能级,对该晶体的发光特性进行了分析。结果表明,NA_aEu(WO_4)_4单晶是有前途的基质激光晶体。     

4-羟基-4′-联苯腈的合成

在三氯化铝催化下 ,以 4-羟基联苯为原料 ,与三氯乙酰氯进行酰基化反应合成了 4-羟基 - 4′-三氯乙酰基联苯 ,经氨解反应得到 4-羟基 - 4′-联苯甲酰胺 ,进而用氯化亚砜脱水制得 4-羟基 - 4′-联苯腈 ,总收率达 5 6% ,纯度≥ 99%。     

Calculation of interaction of AlCl,AlCl_2 and AlCl_3 on Al_4C_3(001) Al_4CO_4(001) and Al_2CO(001) planes

To make sure the intermediate products of the carbothermic reduction of Al2O3 process, such as Al4CO4, Al2CO and Al4C3,and the interaction of AlCl, AlCl2, AlCl3 with Al4CO4, Al2CO and Al4C3, respectively, thermodynamic analyses were used to study the chloride reaction production of them under the vacuum situation. The stable structures and electronic properties of AlCl, AlCl2 and AlCl3 adsorbed on Al4CO4, Al2CO and Al4C3 were calculated by first-principles calculations by the CASTEP module in the Materials Studio program. The results show that the AlCl3 and AlCl2 molecules have decomposed on the plane of Al4C3(001), while there are no obvious decomposition of AlCl3 and AlCl2 on Al4CO4(001) and Al2CO(001) planes. The adsorption of AlCl on the Al4CO4(001)and Al2CO(001) planes is stronger than that on the Al4C3(001) plane. The interaction strength of AlCl3, as well as AlCl2, with Al4CO4,Al2CO and Al4C3 is in the sequence of Al4CO4Al2COAl4C3, while the interaction strength of AlCl with Al4CO4, Al2CO and Al4C3 is in the sequence of Al4CO4Al2COAl4C3.     

Hydrothermal Synthesis of [ Mn5（H2PO4）2（PO4）2（H2O）4]Templated by Calixarene Under Mild Conditions

Meso-and microporous materials are of great in-terest from both the industrial and academic pointof view due to their catalytic , adsorbent , and ion-exchange properties .Inthis way,phosphates of tran-sition metals represent aninteresting group of materi-als owning to their channel structure .Calixarene are macrocyclic molecules in whichseveral phenolic units are linked via —CH2— or—S— bridges at their ortho positions . Calixarene-based receptors are among the most effective and se-lectiv…     

Preparation and Composition—Structure—Thermal Stability Relation of a Novel Open—framework Vanadium Phosphate （H3NCH2CH2NH3）3[（VO）4（PO4）2（HPO4）4]

A novel open-franmework vanadium(IV) phosphate (H3NCH2CH2NH3)3[(VO)4(PO4)2(HPO4)4](short for V2P3-en)has been prepared.It is synthesized hydrothermally in the presence of ethylenediamine(en)at 170℃ for 5 days by self-assembly form sturcturally simple precursors V2O5,H3PO4and H2O.The compound is characterized by means of Fourier transform-infrared spectroscopy(FT-IR),Thermogravimetry-differenti8al thermal analysis(TG-DTA),X-ray powder diffraction analysis(XRD) and Scanning electron microscopy (SEM) \.Furthermore,the composition-structure-thermal stability relation of V2P3-en is exploed in terms of crystal chemistry,and the potential approach to the enhancement of its thermal stability is proposed.     

钨酸铁的超声合成及表征

利用乙二醇为表面活性剂,通过超声合成方法成功制备了粒径均匀、分散性良好的微米级FeWO4。利用粉末XRD、SEM及FT-IR等手段对所制备的FeWO4进行了表征。制得的FeWO4被固定在玻碳电极表面制成FeWO4/CHIT/GCE复合电极,电化学测试发现该电极能够加速Fe(Ⅲ)和Fe(Ⅱ)氧化还原对间的电子转移。进一步在该电极表面固定牛血红蛋白(Hb)后,即得到一种新型的可用于测定溶液中H2O2浓度的传感器。该传感器线性范围为5.0至460μmol·L-1,检测限为1.0μmol·L-1(3σ)。     

30℃时K_2SO_4和（NH_4）_2SO_4在CH_3OH－H_2O溶液中的共饱和度研究

本研究测定了３０℃时Ｋ２ＳＯ４－（ＮＨ４）２ＳＯ４－ＣＨ３ＯＨ－Ｈ２Ｏ四元体系的共饱和度，分析了ＣＨ３ＯＨ含量对Ｋ２ＳＯ４及（ＮＨ４）２ＳＯ４共饱和度的影响，得出了以ＣＨ３ＯＨ为盐析剂，从Ｋ２ＳＯ４和（ＮＨ４）２ＳＯ４的水溶液中晶析Ｋ２ＳＯ４的规律，为Ｋ２ＳＯ４和（ＮＨ４）２ＳＯ４的分离提供理论依据。     

关于丢番图方程x4-4x2y2+y4=193

证明了丢番图方程ｘ＾４－４ｘ＾２ｙ＾２＋ｙ＾４＝１９３仅有正整数解（ｘ,ｙ）＝（１,４）和（４,１）,进而又推得丢番图方程ｘ＾４－１０ｘ＾２ｙ＾２＋ｙ＾４＝－１５４４仅有正整数解（ｘ,ｙ）＝（３,５）和（５,３）。     

Microstructure and dielectric properties of BaTi4O9(f)/0.64 BaTi4O9+0.36 BaPr2Ti4O12 composites

The microstructure, dielectric properties and chemical state of Ti element on BaTi4O9 (f)/(0. 64 BaTi4O9-0. 36BaPr2Ti4O12 ) composites sample surface were characterized by X-ray diffraction (XRD) ,Transmission electron microscopy (TEM), LCR meter method and X-ray photoelectron spectroscopy (XPS).The results show that the system is composed of BaTi4O9 and BaPr2Ti4O12 two phases. Pr ions are distributed inthe BaTi4O9 grains and the segregation of Pr ions was observed on the grain boundaries of BaTi4O9/BaTi4O9.The content of Ti3 + and Ti2+ decrease in the BPT system composites due to the addition of BaTi4O9 fibers,which improved the dielectric properties of the system. BPT10 sample with 10 % BaTi4O9 fibers, has the bestdielectric properties in the system, its εr =64,tan δ = 1×10-4(at 1 MHz) , and it may be a potential candi-date for microwave dielectric ceramics.     

CF_4- CH_4 等离子体对 PET 的表面改性及反应动力学

利用 Ｘ射线光电子能谱仪和接触角方法研究表征了 Ｃ Ｆ４ Ｃ Ｈ４ 混合气体 Ｒ Ｆ等离子体改性 Ｐ Ｅ Ｔ的表面特征根据沉积速率可将整个浓度范围分为三个区域,各区域内等离子体作用机制不同区域１（０～８３．３％ ）为等离子体聚合区域;区域２（８３．３～９６．２％ ）内聚合起主要作用,刻蚀起次要作用,区域３（９６．２～１００％ ）内刻蚀和氟化接枝起主要作用借鉴表面吸附反应动力学模型,推导出等离子体表面类吸附反应动力学方程式,理论计算的沉积速率与实验值有很好的相关性     

2-卤代-4-(反式-4-正烷基环己基)苯甲酸的合成

从4-正烷基环己酮出发合成2-卤代-4-(反式-4-正烷基环己基)苯甲酸,并利用1H NMR谱、质谱、红外光谱和元素分析对其结构进行了表征.目标化合物均呈现向列相液晶.     

镁离子掺杂对LiFePO4材料性能的影响

为了提高LiFePO4的电化学性能,用Mg2 对LiFePO4进行掺杂,以Li3PO4为锂源、Mg(OH)2为掺杂源,采用固相法合成锂离子电池正极材料Li1-xMgxFePO4(x=0.005、0.01、0.02和0.03).通过X射线衍射分析及电化学测试,研究了Mg掺杂对材料的结构和电化学性能的影响.实验研究表明,掺入少量的Mg2 ,可以减小晶胞体积,提高LiFePO4的循环性能和比容量.当Mg的掺入量为2 mol%时,以0.1C倍率充放电,Li0.98Mg0.02FePO4最大放电容量为123.6 mAh/g.