Influence of Exchangeable Cation on Dehydration and Thermal Stability of FIBAN K-1 Fibrous Sulfonic Cation Exchanger

The influence of exchangeable cation on dehydration, desulfonation, and thermal oxidative degradation of FIBAN K-1 fibrous sulfonic cation exchanger in the hydrogen, alkali metal, and alkaline-earth metal forms was studied.     

Activity of Palladium Catalysts Based on FIBAN K-1 Fibrous Sulfonic Cation Exchanger in Reaction of Hydrogen Oxidation

For palladium catalysts based on FIBAN K-1 fibrous sulfonic cation exchanger (Li⁺, Na⁺, Rb⁺, Cs⁺,Mg²⁺,Ca²⁺, Ba²⁺ forms) the dispersity and depth distribution of palladium metal in the fiber and the activity of the catalyst in hydrogen oxidation were studied in relation to the conditions of the synthesis and activation.     

Synthesis and Sorption Properties of Filled Fibrous Sorbents with Immobilized Hetarylformazan Groups

New sorbents were prepared by immobilization of structurally different sulfur-containing hetarylformazans on nonwoven polyacrylonitrile fiber filled with AV-17 anion exchanger. Sorption of some heavy metals on these materials was studied as influenced by various factors. Sorbents for selective recovery of copper(II) in the presence of nickel(II), zinc(II), and cadmium(II) cations were found.     

Preparation of Titanium Phosphate Sorbents from Products of Processing Sphene Concentrate and Properties of These Sorbents

Procedures for the preparation and granulation of sorbents based on TiO(HPO₄)·nH₂O from the products of processing of sphene concentrate were developed. The sorption and hydrodynamic characteristics of the sorbents were determined.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 1, 2005, pp. 66–72.Original Russian Text Copyright © 2005 by Ivanenko, Lokshin, Vladimirova, Avsaragov.     

Preparation and Ion-Exchange Properties of Mixed Zirconium(IV) Phosphate-Phosphonate Sorbents

Composite sorbents based on Zr(IV) phosphate-hydroxyethylidenediphosphonate with different phosphate-phosphonate ratio were prepared. These sorbents were characterized by elemental analysis, X-ray diffraction, and IR spectroscopy, and their ion-exchange sorption capacity for several transition metals and strontium was studied. The sorption capacity of these sorbents increases with increasing pH.     

Sorption Preconcentration of Platinum-Group Metals with Filled Fibrous POLYORGS Sorbents

The sorption of platinum, palladium, and rhodium with fibrous filled POLYORGS sorbents was studied depending on the concentration of hydrochloric acid and the time of contact of the solution with the sorbent in the batch mode. The equilibrium and kinetic characteristics of the sorption of platinum with the POLYORGS 17-n sorbent were determined, on the basis of these data the conditions for the dynamic preconcentration of platinum from a 1 M HCl solution were calculated. Conditions were selected for the group preconcentration of palladium, platinum, and gold in the dynamic mode and for their subsequent determination in the sorbent. It was demonstrated that rhodium can be preconcentrated with the POLYORGS 17-n sorbent in the dynamic mode in the presence of tin chloride.     

Synthesis and Properties of Organomineral Sorbents

Composite sorbents including an active inorganic component and a polymeric binder were obtained. The effect of various factors on their sorption and strength properties was studied.     

高比能LiFePO4的制备及性能研究

应用液相沉淀法-固相烧结法制备高密度的LiFePO4/C及纯相LiFePO4.X射线衍射、扫描电镜、傅立叶红外光谱仪、电化学性能测试表明:该样品具有单一的橄榄石结构和3.4 V左右的放电平台,掺碳的LiFe-PO4具有更优良的性能,粒度较小粒径分布均匀,振实密度达1.46 g/cm3,0.1C首次放电比容量为144.6mAh/g,循环20次后容量保持率为93.2%,1C倍率首次放电比容量为133.5 mAh/g,循环20次后容量下降8.76%.     

Chromatographic Properties of HPLC Sorbents Modified with Zinc Octa-4,5-Carboxyphthalocyanate

The adsorption of the zinc octa-4,5-carboxyphthalocyanate modifier on known HPLC sorbents of different types (Silasorb-C₁₈, Diasorb-130-C₄, Diasorb-130-C₁₆, Spheron C 100 (LC), Spheron C 1000, and Hema S 1000 QL) was studied. The optimum conditions were determined for the modification of the sorbents in the static and dynamic modes. The mechanism of the retention of modifiers and adsorbates was considered, and the amount of the modifier on the surface of the adsorbents was calculated. The effect of the modifier on the retention of adsorbates was demonstrated. Mobile phases were selected for the selective and efficient separation of model mixtures of phenols.     

Specific Features of Glucoamylase Immobilization by Adsorption on Fibrous Polyelectrolytes

Some fundamental aspects of the immobilization of a hydrolytic enzyme glucoamylase via adsorption on aminocarboxylic ion-exchangers with fibrous structure were considered. The sorption capacity of amphoteric supports for the enzyme was studied in relation to the time of immobilization, concentration of hydrogen ions and the protein, and the ionic form of a polyelectrolyte. The catalytic properties of free and immobilized enzymes were compared.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 6, 2005, pp. 1003–1005.Original Russian Text Copyright © 2005 by Shkutina, Stoyanova, Selemenev.     

Preparation and Charactrization of Fibrous Crystals of Boron-containing MTW-type Zeolite

Fibrous crystals of boron-containing MTW-type zeolite have been hydrothermally synthesized in B2O3-SiO2-HF-H2O gel system at 170℃ in 20 to 28d by using 1,4-diazabicyclo[2,2,2]octane (DABCO) and methylamine as the co-template, and characterized with XRD, SEM, TEM, HRTEM and SAED. The results of characterizations show that B atoms are incorporated into the zeolite framework as tetrahedron of B(OSi)4. The fibrous single crystals of 5-50μm in length and 100-500nm in width inter-grow along the c-axis of the zeolite, and the one dimension 12 oxygen ring channels are perpendicular to the fibber axis.     

纳米Fe3O4@壳聚糖材料的制备及吸附性能的研究

以废弃的虾壳为原料制备壳聚糖,以壳聚糖为壳、磁性Fe_3O_4为核、液体石蜡为分散剂、T-80为乳化剂、戊二醛为交联剂制备了纳米Fe_3O_4@壳聚糖材料。利用扫描电镜、热重分析仪、红外光谱仪、X射线衍射仪对其进行了表征。结果显示,纳米Fe_3O_4@壳聚糖材料为表面光滑的球形结构,直径约75.82nm,壳聚糖和Fe_3O_4的质量比为2∶1。吸附动力学实验研究表明,纳米Fe_3O_4@壳聚糖材料对Cu~(2+)吸附符合准二级动力学,以化学吸附为主,平衡吸附容量为17.32mg/g。吸附等温线实验研究表明,吸附符合Freundlic模型,纳米Fe_3O_4@壳聚糖材料与Cu~(2+)之间的交互作用强烈,最大吸附容量为213.68mg/g。     

Preparation and Photovoltaic Properties of p-Type Nano-ZnFe2O4

p-Type nano-ZnFe₂O₄ semiconductors were gained by high-prssure treatment. Surface photovoltaic spectrum(SPS) and transient photovoltaic technology(TPV) were used for studying the photogenerated charge of nano-ZnFe₂O₄. Results show that the photovoltaic behavior of nano-ZnFe₂O₄ changed as the processing pressure increased. When the processing pressure was higher than 2 GPa, both SPS response interval and peak changed significantly. XPS results show that the non-lattice oxygen entered into the lattice and the content of lattice oxygen increased with the increase of processing pressure. The material changed from oxygen vacancy type to oxygen excess type and the photoelectric properties changed from n-type to p-type when the processing pressure is higher than 2 GPa.     

4-羟基香豆素及其衍生物的简便合成及其荧光性质的研究

用米氏酸和苯酚在无溶剂条件下以90.6%的收率合成丙二酸单苯基酯, 然后用Eaton试剂(五氧化二磷＋甲基磺酸)在温和条件下闭环, 以78.8%的收率得到4-羟基香豆素, 将这种方法扩展合成了苯环上带有各种取代基的4-羟基香豆素衍生物以及4-羟基硫代香豆素衍生物. 并对部分4-羟基香豆素衍生物的荧光性质进行了研究.     

对十六烷氧基苯甲酸铽LB膜的制备及发光性质研究

以Tb^3 离子为亚相，成功制备了对十六烷氧基苯甲酸铽的LB膜，研究了对十六烷氧基苯甲酸在纯水和稀土亚相上的单分子行为。红外光谱，紫外光谱表明了亚相稀土离子与羧酸基头发生了配位作用，LB膜在紫外光照射下发出较强的绿色荧光，荧光光谱显示LB膜具有良好的发光性能。     

PS-b-P4VP/CoSm杂化材料的制备及其磁性能

用溶液相金属盐沉积法在苯乙烯与4-乙烯基吡啶嵌段共聚物(PS-b-P4VP) 胶束中制备了平均直径为12 nm的PS-6-P4VP/Co、PS-b-P4VP/CoSm(nCo:nSm=3.8:1,13.0:1)、PS-b-P4VP/Sm纳米粒子.胶束溶液通过高温回流使磁性成核粒子和磁性金属原子的流动能力和扩散能力提高而获得尺寸均一的颗粒.傅里叶红外分析表明.当只有CoCl2加入时,Co2将与多个4-乙烯基吡啶基团配位,而CoCl2和SmCl3同时加入时,由于Sm-4VP配体的屏蔽使Co2 与4-乙烯基吡啶基团的配位数减少.振动样品磁强计对上述样品磁性能的分析表明:随着Sm含量的增加,样品的饱和磁化强度和剩余磁化强度减少,而矫顽力增加.     

CaMoO4∶Eu3+发光材料的制备和发光性质的研究

用共沉淀法与高温焙烧法制备了样品CaMoO4:Eu3+.TG-DTA谱图表明:800℃时,样品吸收的能量最大,即形成稳定的CaMoO4:Eu3+结构.用XRD谱图进一步分析表明:800℃时,样品CaMoO4:Eu3+已形成CaMoO4的白钨矿结构.由于2个Eu3+取代3个Ca2+,导致了晶体产生微小的晶体缺陷,从而形成具有p-n结的半导体.经过激发和发射谱图的测试发现:这种缺陷结构不但可以使Eu3+禁戒的4f电子发生跃迁,而且可以使MoO42-的能量高效地传递给Eu3+.尤其使与MoO42-的发射特征峰(488 nm)部分重叠的Eu3+(465 nm)的7F0→5D2电子跃迁得到了极大的加强,进而在λex=465 nm的发射谱图中,自激活荧光体MoO42-的发射强度被大大减弱甚至猝灭,而Eu3+的5D0→7F2(612 nm)跃迁的红光发光强度被大大增强,使该材料成为有潜在应用价值的发光材料.     

Fe3O4-PEI磁化破乳剂的制备及性能研究

针对乳化原油破乳难度较大的问题,提出了在磁化破乳剂上枝接聚乙烯亚胺（PEI）,增加磁性粒子表面官能团的解决方案,并对其结构进行了表征。研究了破乳剂加量、沉降时间和pH对其破乳效果的影响,磁性粒子的循环利用率,并对其破乳机理进行了探讨。结果表明：磁化破乳剂最优加量为600 mg/L;沉降2 h后,乳化原油透光率仍可达到98.3%;磁化破乳剂Fe₃O₄-PEI在酸性环境中的破乳效果优于碱性环境;磁性粒子重复利用10次后,透光率仍超过90%。      

铋掺杂钒酸钇的合成及发光性能研究

采用高温固相法合成钒基荧光材料YVO4:Bi3+,其最佳掺杂浓度是1.5％,最宜煅烧温度为1000℃.用XRD,SEM以及荧光光谱等手段对所合成的荧光粉进行了表征,结果表明,样品在近紫外光254 nm激发下,产生位于300 ～ 750 nm的宽带发射峰.其中,铋离子浓度为1.5％时,样品的荧光发射主峰543 nm.