检索结果-南通市图书馆

Lactic Acid Assisted Solvothermal Synthesis of BiOClxI1-x Solid Solutions as Excellent Visible Light Photocatalysts

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2019年第2期35卷 277-284页

作者： DUAN Chenglin SONG Jinling wang Baoying LI Lun wang ruifen ZHANG Bangwen School of Material and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010P.R.China

A series of BiOClxI1-x(x=0,0.1,0.3,0.5,0.7,0.9,1.0)photocatalysts was firstly prepared by means of a facile solvothermal route with the help of lactic *** measured results show that the morphologies of the as-prepared samples are similar sheets with different thickness and *** nanosheets assembled flower-like BiOCI0.5I0.5 solid solution exhibited the highest photocatalytic activity and stability among the prepared samples for the degradation of methylene blue(MB)and methyl orange(MO)under the illumination of visible *** excellent photocatalytic properties of BiOCI0.5I0.5 could be attributed to the high specific surface area,the suita-ble band gap energy and the lower recombination rate of the electrons and *** addition,catalyst BiOCI0.5I0.5 was further used to degradate a more complicated mixed dye(MCH-RhB+MB)system under visible light,displaying an excellent photocatalytic ***,the photocatalytic mechanism of catalyst BiOCI0.5I0.5 to degradate colorful dyes was *** trapping experiments of active species indicated that the holes are the main active species for the degradation of the mixed dyes.

关键词： Solid solution Bismutli oxyhalide Mixed dye Solvothennal Photocatalysis

Emission mechanism in the terbium complex doped PVK system

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2008年第Z1期1卷 130-133页

作者： Xiufang LI Zhenbo DENG Yuanyuan ZHANG Yumeng SHI ruifen wang Institute of Optoelectronic Technology Key Laboratory of Luminescence and Optical Information Technology Ministry of Education Beijing Jiaotong University Chemistry College Hebei Normal University

A new kind of rare earth（RE） complex Tb（oMBA）3phen was synthesized and used as an emitting material in *** material was doped into poly（N-vinylcarbazole）(PVK) as the emitting layer,which was made by spin *** kinds of devices were fabricated with the structures:（A） ITO/PVK:Tb（oMBA）3phen/LiF/Al;（B） ITO/PVK:Tb（o-MBA）3phen/BCP/AlQ3/LiF/Al;（C） ITO/BCP/PVK:Tb（oMBA）3phen/AlQ3/LiF/*** green emission could be obtained from device（A） and（C）.The photoluminescence（PL） and electroluminescence（EL） mechanisms of this material had been *** there was an overlap between the PL spectrum of PVK and the excitation spectrum of the terbium complex,there should be a Forster energy transfer process between *** excitation spectrum of PVK doped Tb（o-MBA）3phen system is similar with the excitation spectrum of PVK,yet it is different from that of Tb（o-MBA）***,the emission of Tb（o-MBA）3phen should partly come from the excitation of PVK while in the organic light-emitting diode（OLED）,based on Tb（o-MBA）3phen,the emission mainly comes from the direct recombination of electron and *** green emission can be obtained from the optimized multi-layer device（C） and the highest EL brightness reached 180 cd/m2at the voltage of 17 V.

关键词： terbium complex organic light-emitting diode (OLED) exciton

Kinetics Study on the Thermal Decomposition of Europium p-methyl-benzoate Complex with 1,10-penanthroline under Non-isothermal Con-ditions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2001年第2期20卷 133-136页

作者： Huifang Yang, Jianjun Zhang, ruifen wang (Department of Material, Shjiazhuang Railway College, Shijiazhuang 050043, China Experimental Center, Hebei Normal University, Shijiazhuang 050016, China) 石家庄铁道学院河北石家庄 050016 河北师范大学河北石家庄 050043 河北师范大学河北石家庄 050016

The thermal decomposition reaction of Eu-2(p-MBA)(6)(PHEN)(2) (p-MBA=CH3C6H4COO, methylbenzoate; PHEN=C12H8N2, 1,10-phenanthroline) was studied in a static atmosphere using TG-DTG method. The thermal decomposition process of the complex was determined and its kinetics was investigated. Kinetic parameters were obtained from the analysis of TG-DTG curves by means of the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) method. The most probable mechanism functions of the thermal decomposition reaction for the first stage are: f(alpha) =(1-alpha)(2), g(alpha) = (1-alpha)(-1)-1. The activation energy for the first stage is 255.18 kJ/mol, the entropy of activation DeltaS is 227.32 J/mol and the Gibbs free energy of activation DeltaG is 128.04 W/mol.

关键词： thermal decomposition non-isothermal kinetics mechanisms Eu(III) complex

Y/Eu co-doped TiO_2: synthesis and photocatalytic activities under UV-light

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2015年第2期33卷 154-159页

作者：王瑞芬王福明安胜利宋金玲张胤 School of Materials and Metallurgy Inner Mongolia University of Science and Technology School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Y and Eu co-doped nano-TiO2 photocatalysts were successfully prepared via a sol-gel method and characterized by X-ray diffraction（XRD）, transmission electron microscopy（TEM）, ultraviolet-visible spectrophotometry（UV-vis）, photoluminescence（PL） and Fourier transform infrared（FT-IR） spectra. Experimental results indicated that Y and Eu doping inhibited the growth of crystalline size and the transformation from anatase to rutile phase and had the function of reducing particle reunion. At the same time, co-doping could also enhance the absorption in visible region and then narrowed the band gap. The photocatalytic activities of the samples were evaluated by the degradation of methylene blue（MB） under ultraviolet（UV） light irradiation, which showed much enhanced photocatalytic activities over un-doped TiO2. The degradation rate of 1.5% Y/Eu-TiO2 of methylene blue was 86%, which was about 5 times of that of un-doped TiO2, and the possible reasons for the improvement of photocatalytic activities were analyzed. In this experiment, the dopant amount of rare earth was 1.5% and the ratio of Y：Eu was 2：3 for the maximum photocatalytic degradation, and the sample calcined at 500℃ showed the best reactivity. For the best samples above, the removal rate of phenol under visble light was 53% whthin 2 h.

关键词： TiO2 Y/Eu co-dope UV-light photocatalysis methylene blue rare earths

Non-isothermal decomposition kinetics and lifetime of Tb2(0-MBA)6(PHEN)2

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2003年第3期22卷 155-159页

作者： ZHANGJianjun BAIJihai wangruifen wangShuping LIJibiao ExperimentalCenter NormalUniversityShijiazhuang050016China DepartmentofComputer HebeiNormalCollegeofScienceandTechnologyChangli066600China DepartmentofChemistry HebeiNormalUniversityShijiazhuang050091China

The thermal decomposition of Tb_2(O-MBA)_6(PHEN)_2 (O-MBA: o-methylbenzoate;PHEN: 1,10-phenanthroline) and its kinetics were studied under the non-isothermal condition bythermogravimetry-derivative thermogravimetry (TG-DTG) techniques. Kinetic parameters were obtainedfrom analysis of TG-DTG curves by the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) *** most probable mechanism function was suggested by comparing the kinetic parameters. The kineticequation for the first stage can be expressed as dα/dt = Aexp(-E/RT)·3(1 - α)^(2/3). Thelifetime equation at mass loss of 10% was deduced as lnτ= -28.7429 + 19797.795/T by isothermalthermogravimetric analysis.

关键词： thermochimica non-isothermal kinetics TG-DTG terbium complex O-methylbenzoate 1,10-phenanthroline

一测多评法在冬菊利咽合剂质量控制中的应用研究

在线全文

学校读者我要写书评

暂无评论

中国现代应用药学 2020年第8期37卷 977-980页

作者：王瑞芬李凤琴濮阳市食品药品检验检测中心河南濮阳457000

目的建立一测多评法同时测定冬菊利咽合剂中绿原酸、木犀草苷和3,5-O-二咖啡酰基奎宁酸3种成分的含量。方法采用HPLC:Agilent TC-C_(18)(2)色谱柱(4.6 mm×250 mm,5μm),以乙腈-0.1%磷酸水溶液为流动相进行梯度洗脱,流速1.0 mL·min^(-... 详细信息

目的建立一测多评法同时测定冬菊利咽合剂中绿原酸、木犀草苷和3,5-O-二咖啡酰基奎宁酸3种成分的含量。方法采用HPLC:Agilent TC-C_(18)(2)色谱柱(4.6 mm×250 mm,5μm),以乙腈-0.1%磷酸水溶液为流动相进行梯度洗脱,流速1.0 mL·min^(-1),柱温30℃,检测波长334 nm;以绿原酸为内参物,建立其与木犀草苷、3,5-O-二咖啡酰基奎宁酸之间的相对校正因子(f_(s∕i));采用外标法测定冬菊利咽合剂中绿原酸的含量,通过f_(s∕i)计算冬菊利咽合剂中其他2种成分的含量,并将一测多评法与外标法测得的实验结果进行t检验,验证一测多评法的准确性。结果各成分的fs/i适用性和重复性良好,采用一测多评法和外标法的测定值无显著差异。结论本实验所建立的一测多评法可用于冬菊利咽合剂的定量分析和质量评价。

关键词：一测多评冬菊利咽合剂绿原酸木犀草苷 3,5-O-二咖啡酰基奎宁酸相对校正因子

Synthesis and Properties of Ternary Europium Complexes with Aromatic Carboxylic Acid and Nitrogen-Containing Heterocyclic Ligand

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2006年第3期24卷 275-275页

作者： Ma Ruixia wang ruifen wang Shuping Zhang Jianjun College of Chemistry and Materival Science Hebei Normal University Shijiazhuang 050016 China Experimental Center Hebei Normal University Shijiazhuang 050016 China

Seven ternary Eu （m） complexes were synthesized with aromatic carboxylic acid （benzoic acid, phenylacetic acid, phenylpropionic acid and cinnamic acid） as the first ligand and 1,10-phenanthro- line or 2,2＇-dipyridyl as the second ligand. The ternary Eu（ Ⅲ ） complexes were characterized by elemental analysis, IR and TG-DTG methods. In these complexes, the Eu （Ⅲ） ions are bonded to the oxygen atoms of carboxylate and the nitrogen atoms of neutral ligands. Four complexes whose second ligand is 1,10- phenanthrolin have fine thermal stability. Excitation and luminescence spectra of the tide complexes reveal that the fluorescence of the complexes in which 1,10- phenanthrolin as the second ligand are more intensive than those complexes in which 2, 2＇-dipyridyl as the second ligand. The order of the strongest emission peak of seven ternary complexes is： Eu（β-PPA）3phen 〉 Eu（BA）3phen 〉 Eu（PLA）3phen 〉 Eu（BA）3bipy 〉 Eu （ PEA）3bipy 〉 Eu （ CA ）3phen · H2O 〉 Eu （ CA ）3bipy （BA ： benzoic ; PEA ： phenylacetic ; β-PPA ：

关键词： aromatic carboxylic acid europium ternary complex thermal decomposition fluorescence spectra rare earths

在线全文

学校读者我要写书评

暂无评论

铈锆共掺杂对二氧化钛光催化性能的影响研究

功能材料 2020年第9期51卷 9104-9108,9125页

作者：施凯旋王瑞芬安胜利内蒙古科技大学材料与冶金学院内蒙古包头014010 内蒙古先进陶瓷材料与器件重点实验室内蒙古包头014010

采用稀土元素Ce及金属元素Zr对TiO2进行掺杂改性,通过溶胶凝胶法制备了几种掺杂比例不同的TiO2光催化剂,对所得Ce,Zr-TiO2催化剂进行了结构、光谱表征和光催化性能测试,并考察了铈锆掺杂对样品疏水性能的影响。通过X射线衍射(XRD)物相... 详细信息

采用稀土元素Ce及金属元素Zr对TiO2进行掺杂改性,通过溶胶凝胶法制备了几种掺杂比例不同的TiO2光催化剂,对所得Ce,Zr-TiO2催化剂进行了结构、光谱表征和光催化性能测试,并考察了铈锆掺杂对样品疏水性能的影响。通过X射线衍射(XRD)物相分析表明,制得的样品均为锐钛矿型TiO2,且掺杂铈锆后使TiO2的晶格发生了膨胀;SEM结果表明所得样品形貌均呈海绵状,且粒径分布较为均匀;紫外-可见漫反射光谱(UV-Vis)测试结果表明掺杂铈锆后的TiO2对可见光吸收能力增强,光吸收范围增大;荧光光谱(PL)测试得出,掺杂铈锆后的TiO2样品中电子-空穴对复合几率减小,载流子寿命增加。水接触角(WCA)实验表明,掺杂铈锆后样品的疏水性有所增强。光催化结果表明,光降解时间为140min时,以300W氙灯为光源,样品0.5%M-TiO2对罗丹明B和亚甲基蓝溶液降解率最高,分别达到61.95%和49.61%。

关键词：二氧化钛铈锆共掺杂光催化剂降解率

电化学法研究La-F两步共掺杂纳米TiO2的催化机理

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2019年第8期48卷 2562-2567页

作者：王瑞芬宋金玲李裕安胜利王福明程锦内蒙古科技大学内蒙古包头014010 北京科技大学北京100083

以钛酸四丁酯、硝酸镧和氟化钠等为原料,采用原位掺杂方式制备了La-F两步共掺杂TiO2光催化剂。通过XRD、SEM、XPS和UV-Vis对样品进行了表征,并对样品进行了光催化性能及电化学交流阻抗的测试。结果表明,所制样品均为锐钛矿型TiO2,La-F... 详细信息

以钛酸四丁酯、硝酸镧和氟化钠等为原料,采用原位掺杂方式制备了La-F两步共掺杂TiO2光催化剂。通过XRD、SEM、XPS和UV-Vis对样品进行了表征,并对样品进行了光催化性能及电化学交流阻抗的测试。结果表明,所制样品均为锐钛矿型TiO2,La-F共掺杂使TiO2的晶格发生了较大畸变且晶粒得到了细化,两步共掺杂会加剧样品颗粒间的团聚,也使TiO2的禁带宽度降低。两步共掺杂样品中TiO2与Lax-Fy-TiO2间形成异质结,可有效降低光生电子-空穴的复合,提高载流子浓度。当La和F的掺杂比为1.5%和10%时,两步共掺杂样品的载流子浓度为1.5×10^20 cm^-3,120min时可见光下对亚甲基蓝降解率达到96%,为同等条件下纯TiO2的2.6倍。

关键词：原位合成 La-F两步共掺杂 TiO2 电化学交流阻抗光催化机理