乳状液膜法制备超细碳酸钙

探讨了不同流动载体的煤油、司本 - 80与碳酸钠水溶液制成的乳状液的稳定性 .考察了外相氢氧化钙水溶液中Ca2 + 浓度、膜相磷酸三丁酯的量及乳水比等因素对Ca2 + 迁移率的影响 .经TEM测定 ,破乳后的沉淀颗粒粒径不超过 10 0nm .     

复合稀土氧化物和硫氧化物超细粉的制备和结构

以脲为水解试剂，采用强迫水解法制备了（Ｙ，Ｃｄ，Ｅｕ）２Ｏ３，（Ｙ，Ｔｂ）２Ｏ３，（Ｙ，Ｇｄ，Ｅｕ）２Ｏ２Ｓ和（Ｙ，Ｔｂ）２Ｏ２Ｓ等一系列复合稀土氧化物和硫氧化物细粉，研究了热分解反应的机理以及产物的结构和性能。     

乳状液膜法分离水中的铬

乳状液膜法由于其独特的物理化学性质,已广泛用于金属离子的萃取分离[1～3]。本文以span80-煤油-NaOH液膜体系分离水中铬。不加流动载体,利用内、外相中被分离物的浓度梯度实现物质迁移。当Cr2O2-7进入内相时,与内相的NaOH发生反应,在内相高浓度的NaOH存在下,可保持Cr2O2-7在液膜两侧有最大的浓度梯度,促使Cr2O2-7的迁移,实现Cr2O2-7与外相溶液的分离。1　实验部分1 1　仪器与试剂D40-1型电动搅拌器(杭州仪表电机厂),78-1型磁力加热搅拌器(江苏金坛新一佳仪器厂),721型分光光度计(上海第三分析仪器厂)。铬标准溶液(100ml/L):准…     

微纳米稀土硫氧化物的合成方法研究进展

稀土硫氧化物作为一类重要的发光基质,具有非常高的光吸收和传能效率,是一类重要的光功能材料,被广泛应用在彩色显示、背光源、生物医学等领域,是目前光功能材料领域研究的热点之一.国内外研究者已用先驱物硫化法、氧化物硫化法、水热与溶剂热法、固相反应法、燃烧法、微波法、静电纺丝法等,成功制备了纳米颗粒、纳米管、纳米线、纳米棒、纳...     

X射线荧光光谱法测定不同类型分子筛中氧化物的含量

分子筛是催化裂化催化剂中重要的活性组分.产品中Na2O、Al2O3、SiO2、RE2O3,等元素氧化物的含量将直接影响分子筛的质量和性能.通过对方法准确度和精密度的考察,表明X射线荧光光谱法(XRF)测定分子筛中重要元素氧化物的含量,准确度高,重复性好,是一种高效、快速、能有效指导企业生产的分析方法.     

X射线荧光光谱法测定地质样品中的硫和氟

采用粉末压片制样-X射线荧光光谱法研究地质样品中硫(S)和氟(F)元素的快速测定方法。通过分级过筛实验优化确定样品粒度,探讨样品粒度对测定结果的影响,并进行实际样品和标准物质验证。结果显示,样品粒度为85μm时,经实际样品和标准物质验证,测定结果与化学值和标准认定值相符,且相对标准偏差(RSD)均小于2%。方法具有准确度高、检出限好、测试范围宽、简便快速等优点,能确保样品分析结果的准确性,实现了地质样品中S和F的快速测定。     

稀土离子激活的稀土氧化物和稀土硫氧化物的蓝、绿、红上转换发光与光谱特性

采用冷等静压预处理工艺合成了微细稀土硫氧化物上转换发光材料, 用该法合成的硫氧化物颗粒具有球形形貌、粒径分布均匀与发光亮度高的特点. 对Y₂O₂S:Yb,Tm(蓝色)、Y₂O₂S:Yb,Er(绿色)和Y₂O₃:Yb,Er(红色)三基色上转换发光材料的光谱特性进行了详细研究. 研究出了一种操作简便、亮度准确的测量上转换发光绝对亮度的新方法. 研究结果表明: 将Y₂O₂S:Yb,Tm, Y₂O₂S:Yb,Er, Y₂O₃:Yb,Er按适当比例混合, 可实现全色发光; Y₂O₂S和Y₂O₃基质中的Er³⁺离子具有不同的上转换发光机理; Y₂O₂S:Yb,Er的绿色绝对发光亮度是Y₂O₃:Yb,Er的6.5倍; Y₂O₂S:Yb,Er发光粉在5.56 W/cm²功率密度(980 nm LD)激发下, 其发光亮度高达1100 cd·m^-2. 上述数据表明, 稀土硫氧化物是一种高效的上转换发光基质材料.     

以正十六胺为载体的乳状液膜迁移分离镉(Ⅱ)

以正十六胺为载体的乳状液膜迁移分离镉(Ⅱ)     

乳状液膜迁移分离铋(Ⅲ)

用三异辛胺（ＴＩＯＡ）０Ｓｐａｎ ＳＯ－甲苯乳太液膜迁移Ｂｉ（Ⅲ）的研究表明,在合适的制乳和迁移条件下,Ｂｉ（Ⅲ）可以快速完全地迁入内相,并能与Ｆｅ＾３＋、Ｃｏ＾２＋、Ｎｉ＾３＋、ＡＩ＾３＋、Ｃｒ＾３＋、Ｍｍ＾３＋、Ｃｕ２＋、Ｐｂ＾＋、Ｃｄ＾２＋、Ｃ完全分离。     

Extraction of Arsenic(V) from Water Using Emulsion Liquid Membrane

In this article, the extraction of arsenic(V) from water by means of emulsion liquid membrane is investigated. The influence of operating factors such as stirring speed, concentration of sulfuric acid in the external aqueous phase, concentration of sodium sulfate in internal stripping phase, and concentration of carrier in the membrane phase on the extraction efficiency are investigated and their optimum values, which provide the maximum recovery of arsenic, are determined. Taguchi experimental design is used in order to reduce the number of experiments. The optimum amounts for the extraction of arsenic from water, based on the results, are: stirring speed, 500 rpm; concentration of sulfuric acid in the feed, 1.5 g mol/lit; concentration of reagent in internal phase, 1.5 g mol/lit; and concentration of carrier in 3 ml kerosene which is added to the membrane phase, 0.1 g mol/lit.     

Formation Mechanism of Zinc Oxalate Particles in the Internal Aqueous Droplets of Emulsion Liquid Membrane

We have investigated the formation and evolution of zinc oxalate particles in internal aqueous droplets and their effects of emulsion interface properties. The formation of particles follows an aggregation-controlled mechanism that depends on the size of droplets and surfactant. The size of droplets determines the final shape of the particles by affecting the supersaturation ratio to form rod-like and sheet-like particles. The surfactant adsorbed on the particles changes the wettability, leading to the aggregation of the primary particles at the internal water-oil interface. Moreover, the adsorption can cause a higher level of impurity and defects in as-synthesized particles. This effect could be directly employed to fabricate heterojunction rectifier.     

Assembling Synthesis of ZnSe Orthohexagonal Slices through Emulsion Liquid Membrane System of Gas-liquid Transport

Orthohexagonal slices assembled by ZnSe quantum dots were synthesized through emulsion liquid membrane system. These orthohexagonal slices were 1.5-3.5 μm in side length and were self-assembled by ZnSe quantum dots of 2-3 nm. It was proposed the surfactant molecules on ZnSe quantum dots played a key role in the self-assembly process.     

含TOMAC乳状液膜萃取L-苯丙氨酸的迁移机理及应用

以L 苯丙氨酸在液膜体系里的迁移机理为基础 ,把液膜萃取过程中的萃取和反萃两个连续过程结合起来加以研究 ,推出了在整个液膜体系达到萃取终了时的内外相氨基酸浓度比公式 ,并以TOMAC为载体萃取L 苯丙氨酸为例 ,讨论了影响液膜萃取的控制因素 ,实现了L 苯丙氨酸的有效回收。     

乳状液膜法分离水中镉

本文报道了用乳状液膜法分离镉的研究。在此分离体系中,以煤油作为膜溶剂,span80为表面活性剂,磷酸三丁酯(TBP)为载体,液体石蜡为膜增强剂。详细讨论了制乳时间、混合时间、搅拌速度,span80、TBP以及液体石蜡的浓度,乳水比和油内比,内相氨水和外相HCl溶液的浓度对分离的影响,确立了最佳分离条件。     

用甲基丙烯酸十二酯/丙烯酸共聚物作乳状液膜稳定剂迁移锌(Ⅱ)

用甲基丙烯酸十二酯/丙烯酸共聚物作乳状液膜稳定剂迁移锌(Ⅱ);两亲高分子;乳状液膜;迁移;锌离子     

镍在乳状液膜体系中的迁移行为

研究了镍在乳状液膜分离体系中的迁移行为。在此分离体系中,以煤油作为膜溶剂,span80为表面活性剂,磷酸三丁酯(TBP)为载体。详细讨论了制乳时间和混合时间、span80和TBP浓度、乳水比和油内比、内相NH。和外相HCl的浓度对镍迁移率的影响,确立了最佳分离条件。     

Biomimetic Synthesis of CdSe Quantum Dots through Emulsion Liquid Membrane System of Gas-Liquid Transport

The cadmium selenide quantum dots (QD) have been synthesized by template-control in an emulsion fiquid membrane system. The system consisted of kerosene as solvent, L152 (dialkylene succinimide) as surfactant,N7301 (trialiphatic amine, R3N, R=C8-C10) as carrier, 0.1mol/L CdCl2 solution as internal-aqueous phase and H2Se gas as external phase. Additive organic template agent in internal-aqueous phase was necessary to form CdSe QD. The influence of the nature of template and its concentration on sizes of the formed CdSe QD has also been studied. Transmission electron microscopy showed that the sizes of the products could be controlled down to 3-4nm. X-ray diffraction analysis revealed that the crystals had cubic structure. The formation process and the optical properties of CdSe QD have also been presented.