Eu3+:Y2SiO5晶体透射光谱和荧光谱研究

在室温条件下,对Ｅｕ＾３＋：Ｙ２ＳｉＯ５晶体的透射光谱和４５７．９ｎｍＡｒ＾＋激光激发荧光谱进行测量和研究。这些光谱表明,Ｅｕ＾３＋离子在Ｙ２ＳｉＯ５晶体中占据两种最低对称性Ｃ１格位。利用透射光谱和荧光谱对Ｅｕ＾３＋离子的最低激发态＾５Ｄ０的两种格位光谱进行了成功分离。实验发现,在＾５Ｄ０态两种格位谱的谱宽只有０．１ｎｍ左右,其峰间隔约为０．１８ｎｍ。另外,文中还测量了Ｅｕ＾３＋离子的基态＾７ＦＪ     

稀土离子Eu3+掺杂Y2SiO5晶体的光谱和结构研究

用５１４．５ｎｍ、４８８．０ｎｍ的Ａｒ＾＋激光和４４１．６ｎｍ的Ｈｅ－Ｃｄ激光激发Ｅｕ＾２＋：Ｙ２ＳｉＯ５晶体的获得了一系列窄带荧光谱线,其中双重谱线结构源于Ｅｕ３＾＋离子发光中在该材料中占据两种不等价的非对称光学格位,测得了Ｅｕ＾３＋：Ｙ２ＳｉＯ５的Ｘ射线多晶衍射谱的面间距数据;计算了晶格常数和晶在角度,通过和非掺杂Ｙ２ＳｉＯ５晶体数据的比较,探讨了Ｅｕ＾２＋和Ｙ２ＳｉＯ５格位的相互影响。     

铜铬氧化物催化剂的结构与性能研究

用ＥＰＲ，ＸＲＤ，ＳＥＭ，ＸＰＳ，ＴＰＲ，ＤＳＣ等手段综合考察了铜铬氧化物催化剂结构与性能的联系，研究表明，油脂常压加氩时铜铬氧化物催化剂的活性组份是一种ＣｕＯ和ＣｕＣｒ２Ｏ４的紧密结合物，其中Ｃｕ，Ｃｒ分别以Ｃｕ＾２＋，Ｃｒ＾３＋形式存在，氢化反应后Ｃｕ＾２＋形式存在。氢化反应后Ｃｕ＾２＋被还原成Ｃｕ＾０，而Ｃｒ＾３＋不变，研究还表明，当焙烧气氛中氧较充分时会使催化剂中一部分Ｃｒ＾３＋氧化成Ｃｒ     

Cu2+对鲁米诺阳极电致化学发光的抑制作用

本文研究了Ｃｕ＾２＋对碱性鲁米诺阳极电致化学发光的影响,发现Ｃｕ＾２＋对发光峰强度有明显的抑制作用。通过对溶液ｐＨ值及离子强度、溶液中支持电解质种类、理米诺浓度和ＥＤＴＡ对抑制作用影响的讨论,结合Ｐｔ电极表现ＸＰＳ谱图的分析结果,给出了可能的抑制机理;非常微小的Ｃｕ（ＯＨ）２分子聚体参与了电极氧化过程中双电层的形成,阻碍了电化学发光活性物质的生成和传质速率。在一定条件下,发光峰强度的减小量与Ｃｕ＾     

铜基催化剂表面缺陷对催化性能的影响

用顺磁共振谱研究外来离子含量与由这些正三价金属离子在ＺｎＯ表面诱导出一的正一价缺位数量之间的关系。结果表明，Ａｌ＾３＋和Ｓｃ＾３＋对ＺｎＯ表面的正一价缺位都有诱导作用，其中Ｓｃ＾３＋的掺杂对正一价缺位的诱导更有效。ＴＰＲ结果显示，随着样品中Ｓｃ＾３＋含量的增加，归属于Ｃｕ＾２＋→Ｃｕ＾＋和Ｃｕ＾＋→Ｃｕ＾０ ＴＰＲ谱最高峰温分别向低温和高温方向移动。     

稀土（Eu^3＋,Tb^3＋）含氮杂环配合物的合成,表征及其荧光性质

在无水乙醇溶液中分别合成了Ｅｕ＾２＋离子、Ｔｂ＾３＋离子与２，２‘－联吡啶、１，１０－邻菲罗啉押种配合物，研究了配合物的荧光性质，由于Ｐｈｅｎ含有较大范围的共轭π键和较好的刚性平面，含Ｐｈｅｎ配合物的荧光强度均要比配合物的强；配合物的高分辨荧光光谱表明，Ｅｕ＾３＋离子在Ｅｕ（Ｄｉｐｙ）２Ｃｌ３’２Ｈ２Ｏ和Ｅｕ（Ｐｈｅｎ）２Ｃｌ３．２Ｈ２Ｏ配合物中处于Ｃ１或Ｃ２或Ｃ５的对称性位置。     

MAl2O4：Eu^2＋,RE^3＋,长余辉发光性质的研究

研究鳞石英结构碱土铝酸盐ＭＡｌ２Ｏ４：Ｅｕ＾２＋,ＲＥ＾＋（Ｍ＝Ｍｇ,Ｃａ,Ｓｒ,Ｂａ：ＲＥ＝Ｙ,Ｌａ,Ｃｅ,Ｐｒ,Ｎｄ,Ｓｍ,Ｇｄ,Ｔｂ,Ｄｙ,Ｈｏ,Ｅｒ,Ｔｂ,Ｄｙ,Ｈｏ,Ｅｒ,Ｔｍ,Ｙｍ,Ｙｂ,Ｌｕ）的荧光及长余辉发光性质。其发光由Ｅｕ＾２＋的４ｆ－５ｄ跃迁产生。ＲＥ＾３＋作为辅助激离子,提供合适的陷阱能级。即使用ＲＥ＾３＋的特性波长激发,在ＭＡｌ２Ｏ４：Ｅｕ＾３＋的发光中也观察不到ＲＥ＾３     

Ca8Mg(SiO4)4Cl2中Ce3+和Eu2+的光谱性质和能量传递

首次合成了Ｃｅ＾３＋和Ｅｕ＾２＋共激活氯硅酸镁钙Ｃａ８Ｍｇ（ＳｉＯ４）４Ｃｌ２：Ｃｅ＾３＋，Ｅｕ＾２＋高效绿色荧光粉，报道了它们的漫反射光谱、激发和发射光，观察到氯硅酸镁钙中Ｃｅ＾３＋ Ｅｕ＾２＋     

稀土无机发光材料Ca1—nMgnS：Cu^＋,Eu^2＋的合成与光谱特征

报道了Ｃｕ＾＋，Ｅｕ＾２＋共激活的Ｃａ１－ｘＭｇｎＳ的发光性质，基质组分变化与荧光性质的关系，Ｃｕ＾＋和Ｅｕ＾２＋在纯ＣａＳ基质中的发射光谱分别位于４３０ｎｍ及６３０ｎｍ附近，随着基质中Ｍｇ含量的增加，红，蓝区发射峰值波长基本不变，但强度发生明显改变，当ｎ为０．２５时，红区发射强度最强。     

F／Cl与Eu^2＋：BaFcl中F色心的浓度和光激励截面的关系

研究了Ｅｕ＾２＋：ＢａＦｘＣｌ２－ｘ在紫外线辐照下的光激励发光。通过改变激励方式激励光的扫描方向，给出了Ｅｕ＾２＋：ＢａＦｘＣｌ２－ｘ光激励发光过程中，两种Ｆ色心的浓度比值与光激励截面比值的测定方法。利用这种测定方法，进一步研究了两种Ｆ色心的浓度比值和光激励截面比值与Ｆ／Ｃｌ比值的关系。     

氨基酰化酶与Cu(Ⅱ)相互作用的谱学研究

通过顺磁共振法、可见光谱法及酶活性测量研究从猪肾中提纯的氨基酰化酶（Aminoacylase,简称ACY）在pH4.0条件下与外加的Cu(Ⅱ）离子存在直接相互作用。结果发现：外加Cu(Ⅱ）离子进入ACY活性中心位点,取代了活性中心位点的Zn(Ⅱ）,使酶活性下降。随着pH变化生成的两种构型酶衍生物在溶液中可相互转化。     

Utilization of Mg2Al–layered double hydroxide as an effective sequestrator to trap Cu(II) ions from aqueous solution impacted by water quality parameters

Recently, Mg₂Al–layered double hydroxide (Mg₂Al–LDH) has been extensively studied as promising candidates to trap metal ions due to their high complexation and adsorption capacity. Herein, Mg₂Al–LDH was utilized as an effectiveness sequestrator to trap Cu(II) ions from aqueous solution by an adsorption process using batch technique under ambient conditions. The results showed that Cu(II) adsorption on Mg₂Al–LDH increases with pH increasing and maintains a high level at pH>7.0. The adsorption of Cu(II) was obviously affected by ionic strength at low pH, which was not dependent on ionic strength at high pH. The presence of HA or FA promotes the adsorption of Cu(II) on Mg₂Al–LDH at low pH values, while reduces the adsorption of Cu(II) at high pH values. The adsorption isotherms of Cu(II) on Mg₂Al–LDH at three different temperatures were simulated by the Langmuir, Freundlich, and Dubinin-Radushkevitch (D–R) models very well. The thermodynamic parameters were determined from the temperature-dependent adsorption, and the results showed that Cu(II) adsorption on Mg₂Al–LDH was exothermic and the process was favored at high temperature. The results suggest that Mg₂Al–LDH is suitable as a sorbent material for the recovery and attenuation of Cu(II)-polluted wastewater.     

双水相体系中Cu(Ⅱ),La(Ⅲ),U(Ⅵ),Ce(Ⅳ)光谱行为及萃取分离

利用聚乙二醇2000(PEG)-(NH)2SO4-萃取剂(铜试剂)双水相体系,采用液-液萃取的方法,研究了PEG相、单纯水相中金属离子络合物及萃取剂的光谱行为,探讨了金属离子络合物在PEG相中存在形态及萃取机理。同时实验了在不同酸度,不同盐用量,不同萃取剂用量,以及在不同表面活性剂的影响下,铜、镧、铀、铈的萃取率,通过控制一定条件,实现了Cu(Ⅱ)与La(Ⅲ),Cu(Ⅱ)与Ce(Ⅳ)之间的定量萃取分离。     

Spectroscopic studies of electronic structure of copper(II) ethanolamine complexes in solutions and in impregnated wood

Optical and electron paramagnetic resonance (EPR) spectra were recorded for a series of Cu(II) complexes with monoethanolamine (EA) and the quaternary ammonium compound (QAC) alkyldimethylbenzylammonium chloride in aqueous solution with H₃BO₃ which are tested as modern impregnating solutions for wood preservation. It is proved that in aqueous solutions of Cu-EA the octahedral complexes I, Cu(EA)₂(H₂O)₂, exist with water in apical positions. The addition of the QAC results in an exchange of water for nitrogen of the QAC molecules with a possible partial destruction of the coordinating molecule (complex II). The detailed electronic structure is determined for both species I and II. Boric acid does not influence the complex structures. In the treated wood (Pinus silvestris L.) the complex I is destroyed and Cu(EA)₂ is attached to the OH groups of cellulose molecules, forming a stable complex. The complexes II still exist in wood, but with higher-concentration impregnating solution a part of these complexes is destroyed by coordination to the OH groups of cellulose molecules.     

Effect of polymer adsorption on the water structure at the quartz/water interface studied by optical sum frequency generation

The effect of polymers weakly adsorbed on a quartz surface on the structure of the interfacial water molecules was investigated by optical sum frequency (SF) spectroscopy. As polymers, poly(ethylene glycol) (PEG), poly(propylene glycol) (PPG), and two types of tri-block copolymer of Pluronic L64 and 17R-4 were used. SF intensity spectra of OH stretching mode of water molecules at the interface between a quartz substrate and aqueous solutions of the polymers were measured. The total SF intensity of the interfacial water of the L64 aqueous solution was smaller than those of other solutions. This result indicates that the L64 aqueous solution has smaller number of oriented interfacial water molecules. It is suggested that the rapid motion of hydrophilic parts of the adsorbed L64 disturbs the average orientation of the interfacial water molecules. On the other hand, the SF intensity from the interfacial water molecules of aqueous solutions with high ion strength did not depend on the species of the polymers in the solutions. The latter result suggests that the hydration of ions determines the structure of the interfacial water molecules.     

Application of bifunctional Saccharomyces cerevisiae to remove lead(II) and cadmium(II) in aqueous solution

A magnetic adsorbent, EDTAD-functionalized Saccharomyces cerevisiae, has been synthesized to behave as an adsorbent for heavy metal ions by adjusting the pH value of the aqueous solution to make carboxyl and amino groups protonic or non-protonic. The bifunctional Saccharomyces cerevisiae (EMS) were used to remove lead(II) and cadmium(II) in solution in a batch system. The results showed that the adsorption capacity of the EMS for the heavy metal ions increased with increasing solution pH, and the maximum adsorption capacity (88.16 mg/g for Pb²⁺, 40.72 mg/g for Cd²⁺) at 10 °C was found to occur at pH 5.5 and 6.0, respectively. The adsorption process followed the Langmuir isotherm model. The regeneration experiments revealed that the EMS could be successfully reused.     

Tween-80-(NH4)2SO4-XO体系中铜、镧、铀、铈光谱及萃取性能研究

利用二甲酚橙作萃取剂 ,在吐温 80 (NH4 ) 2 SO4 二甲酚橙 (XO)固 液萃取体系中 ,研究了萃取相 (固相 )中金属离子络合物吸收光谱 ,与XO光谱比较 ,Cu(Ⅱ ) ,U(Ⅵ ) ,Ce(Ⅳ )离子吸光度增大 ,最大吸收波长红移 2 0～ 30nm ;La(Ⅲ )离子几乎未变。同时探讨了该体系中不同酸度、不同盐用量、不同萃取剂用量、不同类型表面活性剂 ,对Cu(Ⅱ ) ,La(Ⅲ ) ,U(Ⅵ ) ,Ce(Ⅳ )离子的萃取率的影响 ,在pH 6 0的酸度下 ,实现了La(Ⅲ )与U(Ⅵ )之间的萃取分离。     

铜锌超氧化物歧化酶与色氨酸钴(Ⅱ)的相互作用

采用ＶＩＳ、ＩＣＰ及酶活性测定等方法,研究铜锌超氧歧化酶（Ｃｕ２Ｚｎ２ＳＯＤ）与色氨酸钴（Ⅱ）（Ｃｏ（Ｔｒｐ）＾ｎ）的直接相互作用以及外加色氨酸钴（Ⅱ）的量、溶液ｐＨ值对此类相互作用的影响。结果发现：在水溶液中原酶活性中心处的Ｚｎ（Ⅱ）离子可被外加的色氨酸钴（Ⅱ）部分诱导、交换出来,而溶液中外加的Ｃｏ（Ｔｒｐ）＾ｎ中的Ｃｏ（Ⅱ进入酶的活性中心,形成“Ｃｏ－ＳＯＤ”酶衍生物,并相应影响了酶的催化活性     

Copper-containing polyvinyl alcohol composite systems: Preparation,characterization and biological activity

The present investigation reports, the complex formation of Cu(II) with polyvinyl alcohol (PVA) and the synthesis of PVA-stabilized Cu₂O particles. This PVA–Cu₂O composite has been prepared via chemical reduction method using PVA–Cu(II) complex as precursor. At first, Cu(II) ions were stabilized in PVA matrix via complex formation with OH groups; subsequently, this PVA–Cu(II) macromolecular complex as precursor reacted with ascorbic acid as reducing agent at pH=12 to prepare PVA–Cu₂O composite. The products were characterized by FTIR, XRD, FE-SEM, HRTEM, Visible Spectroscopy and atomic absorption. In the following, the antibacterial properties of as-prepared composites were examined against Gram-positive (Bacillus thuringiensis) and Gram-negative bacteria (Escherichia coli), and the results showed excellent antibacterial activity of these materials.     

Modified polypropylene fabrics and their metal ion sorption role in aqueous solution

Polypropylene non-woven fabrics were grafted with glycidyl methacrylate by the electron beam irradiation method and the introduced epoxide rings were chemically conversed to hydroxyl and thiol groups. The modified polypropylene fabrics showed sufficient hydrophilicity to adsorb the metal ions from the aqueous solutions. The modified fibers were examined as adsorbents for metal ions dissolved in seawater and its model solutions at various conditions. The amount of ions adsorbed on the fabrics was determined by a sequential plasma spectrometry. The modified polypropylene fabrics adsorbed extremely high amount of Au(III) and Hg(II) ions. The equilibrium adsorption of Au(III) was almost not disturbed, even if Cu(II), Cd(II), Pb(II) and the other ions coexisted in the same aqueous solution. Nowadays, the most widely advantages of this technique are the recovery of metal ions dissolved in water and the treatment of industrial wastewater systems.