水热法合成钛硅酸盐新型无机离子交换剂

用水热法合成出一种新型的结晶水合钛硅酸盐（ＣＳＴ）,并用ＸＲＤ、ＳＥＭ、ＤＴＡ－ＴＧＡ、Ｘ－荧光方法对它进行了表征。在１ｍｏｌ／Ｌ ＨＮＯ３的水溶液中,ＣＳＴ对Ｃｓ交换量为０．６３ｍｍｏｌ／ｇ,在ｐＨ＝３时,ＣＳＴ对Ｃｓ的交换量达最大为１．６ｍｍｏｌ／ｇ,表明ＣＳＴ可以在酸性水溶液中作为Ｃｓ的离子交换剂使用。     

亚铁氰化钛钾从模拟高放废液中去除Cs中试初步研究

本文研究了无机离子交换业铁氰化钛钾对模拟高放废液进行三柱串级的中试实验,结果表明：当模拟高放废液中Ｃｓ的浓度为１．１５ｇ／Ｌ,酸度为１．１ｍｏｌ／Ｌ,焖液流速为２．０ＢＶ／ｈｙ,交换柱穿透率为１％时,干交换剂的交换容量为０．３８ｍｍｏｌ／ｇ,９０％穿透时,交换容量可达０．７７ｍｍｏｌ／ｇ,交换后的废交换剂用０．１ｍｏｌ／Ｌ的硝酸洗涤,卸柱时树脂仍保持良好的球型,说明交换剂亚铁氰化钛钾有良好的机械稳     

球形复合无机离子交换剂水合氧化钛-硅钛酸钠的制备及性能研究

用溶胶-凝胶法制备了球形除铯复合无机离子交换剂水合氧化钛-硅钛酸钠(HTO-NaTS),研究了在酸性条件下其对铯离子的交换性能,并对其结构、稳定性作了初步研究.结果表明,此种球形交换剂在强酸性条件下机械稳定性好,适合装柱,在1mol/L HNO3水溶液中,对铯离子具有较高的交换容量.     

用亚铁氰化钛钾从模拟高放废液中吸附Cs研究

本文研究了溶胶-凝胶法合成的无机离子交换剂亚铁氰化钛钾的耐酸性和辐照稳定性等性能，测定了从模拟酸性高放废液中主要常量组分离子相对于Cs的分离系数，研究了流速对Cs吸附曲线的影响。实验结果表明，该交换剂具有良好的辐照稳定性，交换剂经2×106Gy的辐照，亚铁氰化钛钾对Cs的表观交换容量下降6～7％，为0．873mmolCs／g干交换剂。在0．5～1．5mol／LHNO3中具有良好的化学稳定性。在模拟酸性高放废液中对几种离子的选择吸附顺序为：Cs＞＞M＞Fe＞Sr＞Na＞Cr＞Nd，Mn，该交换剂具有较高的吸附容量，对Cs具有良好的选择性，有希望用作从酸性高放废液中去除Cs的材料。     

新型无机离子交换剂的研究：Ⅴ.偏磷酸铈的离子交换色谱法应用

新型无机离子交换剂的研究Ⅴ．偏磷酸铈的离子交换色谱法应用苏政权（广东药学院预防医学系卫生化学教研室广州５１０２２４）封惠侠（河南信阳教育学院化学系河南４６４０００）张秀莲（广东教育学院化学系广州５１０３０３关键词离子色谱偏磷酸铈分离中图分类号Ｏ６５７...     

水合二氧化钛-磷钼酸铵微球复合无机离子交换剂的合成

采用溶胶－凝胶方法合成水合二氧化钛微球,以此为基体合成出水合二氧化钛－磷钼酸铵（ＨＴＯ－ＡＭＰ）球形复合无机离子交换剂,研究了复合交换剂的组成和稳定性,测定了不同交换条件下其对Ｃｓ＾＋和Ｓｒ＾２＋的交换性能,发现复合交换剂性能稳定,对Ｃｓ＾＋在不同酸度下均有较好交换性能,对ＳｒＡ＾２＋则只有在低酸度时才有一定交换吸附。     

微晶形无机离子交换剂焦磷钡酸锡的结构分析

通过大角度X－射线衍射技术，求出了微晶形交换剂焦磷磷钡酸的径向分布函数，推断出其化学结构。应用这一结构较了地解释了交换剂的离子交换反应性质。     

离子交换树脂去除模拟放射性废液中的铯

核电站放射性废液组成复杂,其中¹³⁷Cs、⁹⁰Sr和⁶⁰Co是放射性废液处理的主要目标。 本文采用稳定同位素模拟放射性废液,研究了Cs⁺离子在强酸性阳离子树脂IRN97中的交换等温线、动力学特性以及固定床穿透行为,探讨了共存的硼酸和Sr²⁺、Co²⁺等核素离子对Cs⁺离子交换行为的影响。 结果表明,废液中存在的高浓度硼酸在一定程度上会减小树脂对Cs⁺的交换量;与共存的Sr²⁺和Co²⁺离子相比,虽然Cs⁺的交换速率快,但树脂对Sr²⁺和Co²⁺的选择性更高,因此在达到交换平衡状态下,Sr²⁺和Co²⁺的交换容量大于Cs⁺;在采用固定床吸附柱进行的动态吸附中,提高Cs⁺的进水浓度可以提高树脂的利用率。     

新型含磷无机离子交换剂的合成 Ⅴ.六偏磷酸锡的合成、性能和应用研究

本文报道一种新的无机离子交换剂——六偏磷酸锡。通过对合成条件的选择,热分析,红外、X-射线衍射分析及离子交换性能的测定,表明它是一种交换容量大(2.55m mol/g)、热稳定性和化学稳定性好的多功能基无定形无机离子交换剂,对某些高价金属离子、Pb(Ⅱ)和Ag(Ⅰ)具有高选择性。成功用于Fe(Ⅲ)/Fe(Ⅱ)的分离和微量Fe(Ⅲ)的定量测定。     

亚铁氰化钾钛从模拟高放废液中交换Cs^＋的机理研究

本文研究了亚铁氰化钾钛在模拟酸性高放废液中交换Cs 的行为。通过改变温度、粒度、振荡频率、料液不同的稀释倍数等因素对Cs 交换速度的影响，测定了交换过程中交换体中组分随所交换的Cs 的变化，得出亚铁氰化钾钦对Cs 的交换主要是粒扩散和膜扩散混合控制，是交换体中的K 与溶液中的Cs 进行了交换。     

多孔晶态硫化铟的合成、表征及铯离子交换性能研究

用水热法合成了一种新型无机离子交换材料。XRD,IR,TGA-DTA,SEM-EDX,孔结构测定和元素分析等表征研究揭示:产物为多孔晶态硫化铟(经验分子式为:[In10.5S14.5].[(H2NCH2CH2-NHCH2)2]2.5);有较高热稳定性;模板剂三乙烯四胺填充于材料构架的空隙或孔道中,同时起平衡材料整体构架电荷的作用。离子交换试验结果表明,合成产物在较大的酸度范围内(pH=4~[H ]=1mol/dm3)对Cs 保持稳定的交换能力,最大交换容量为:0.31mmol/g。     

双功能聚合物基质阳离子交换固定相的制备及其在离子色谱中的应用

离子色谱是分离分析阳离子型化合物的重要手段之一。高效阳离子交换固定相的制备研究对离子色谱技术的发展具有重要的意义。该文以丙烯酸和顺丁烯二酸酐为单体,2-巯基乙基磺酸钠为巯基改性剂,提出了聚合物基质微球巯基改性自由基聚合修饰方法,用以制备新型双功能的阳离子交换固定相。该固定相以羧基和磺酸基为功能基,仅用简单的强酸淋洗液便可以实现常规阳离子的基线分离。利用色谱学模型,对金属离子和有机胺的保留行为进行了研究。采用梯度淋洗模式,可在24 min内实现10种阳离子的分离,表明固定相具有优异的色谱性能。"巯基-烯"修饰方法简单、高效。此外,通过调节巯基改性剂的比例能够实现对固定相交换能力的调控。     

Inorganic ion exchangers in radioactive waste management

The removal behavior of stannic and zirconium phosphates was assessed for Sr(II) ions as a function of sorptive concentration, temperature and pH. It was observed that an increase of these parameters enhanced the removal of Sr(II) ions from aqueous solutions. First order uptake of Sr(II) followed the Freundlich adsorption isotherm for the entire range of sorptive concentration (10^-2 to 10^-8 mol^.dm^-3). The study of temperature dependence showed that the endothermic and irreversible type of uptake proceeds by an ion-exchange type mechanism.     

Calculation on ion exchange capacity for an ion exchanger using the potentiometric titration

We calculated the characteristics of a phosphoric cation exchanger and studied an accurately computable method for ion exchange capacity for a type of potentiometric titration curve. The ion exchanger was prepared by phosphorylation of a styrene‐divinylbenzene copolymer. The ion exchange capacity was 5.7 meq/g. The experimental pK values versus χ in a phosphoric cation exchanger can explain a linear equation. The ΔpK values were obtained from the slope of a linear equation. The ΔpK values were the differences of pK values between the apparent equilibrium constant at complete and zeroth neutralization of the ion exchanger. The experimental pK values at χ = 0.5 (χ:degree of neutralization of ion exchanger) showed good agreement with the theoretical data. When it was titrated with NaOH and Ba(OH)₂ solutions, a good agreement between experimental and theoretical pK values for various χ was found in all potentiometric titration curves. The potentiometric titration curve near the inflection point in the case of divalent ions was changed more sharply than that for monovalent ions. The plot of ∂pH/∂g versus g (number of moles of alkali to 1 g of ion exchanger) was fitted to the Lorenzian distribution, from which ion exchange capacity was accurately evaluated. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 3181–3188, 2000     

用无机离子交换剂制备90Sr-90Y发生器的研究

研究了无机离子交换剂硅酸锑(SS)、焦磷钨酸锡(SWPP)等的制备以及它们对锶、钇的选择性;研究了硅酸锑(SS)的热稳定性和辐照稳定性.结果表明不同的无机离子交换剂对锶、钇的选择性差别很大,硅酸锑(SS)制备工艺简单,对锶有较强的选择性且介质酸度对其选择性影响较大,具有良好的热稳定性和辐照稳定性.在柱式操作中,对锶和钇的分离系数最大可达5.5 ×104.     

MECHANISM OF CESIUM EXCHANGEWITH POTASSIUMTITANIUM HEXACYANOFERRATE

1.INTRODUCTIONItiswellavowthathexacyanoferratesaregoodinofganicionexchnaerforcesium.TheyhavehighselectivityandquitehighcapacitytowardsCs inthehighsaltcontentsolution[l'2].Althoughmuchworkhasbeendoneonthestudiesofsyntheticandpropertiesofcyanoferratesforcesiumseparation["'],relativelylittleinformationisavailableonthemechanismoftheionexchangereaction.ThepreparationandmechanismofzincferrocyanideshadbeenstUdiedbyLoos-Neskovic161.HefoundthatzincfermcyanideshadtWoS~tUralformulas.ZnFe(CN),oH…     

Analytical study of highly condensed non ionic surfactants. Separation on cation exchangers

Summary This study was aimed at optimizing the separation of non-ionic surfactants, resulting from the condensation of ethylene oxide with natural fatty alcohols in the C₁₆ and C₁₈ range (saturated and unsaturated), and presenting a high degree of condensation, i.e. 20 and 25 ethylene oxide units (Brij 99 and KM 25). The cation exchange stationary phase is a partially ionized silica, conditioned in different ways. We have studied the influence of the nature of cations on the separation selectivity. Cations studied included alkali metals (Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺), alkaline earth metals (Mg²⁺, Ca²⁺, Sr²⁺, Ba²⁺), transition metals (Zn²⁺, Cd²⁺, Hg²⁺, Pb²⁺, Cu²⁺), and quaternary ammonium (NH ₄ ⁺ , NMe ₄ ⁺ ) ions as well as a proton (acetic acid). The influences of ionic strength, pH and addition of cosolvent were examined. A study of the influence of temperature on the system selectivity evidenced a strong interdependance of these two parameters. The optimized conditions [mobile phase: CH₃CN/H₂O (92/8), pH 7.4, sodium acetate 5.10^–3 M; temperature gradient between 25 and 50°C] allowed for the first time the distributions of Brij 99 and KM 25 to be obtained.     

无机离子交换剂磷酸钛的结晶行为及其对交换性能的影响

利用Ｘ射线衍射法，研究了各种类型水合磷酸钛晶体的磷酸回流法中的形成条件。探讨了具有不同结晶度的一水合磷酸钛对交换性能的影响。     

Liquid phase microextraction‐ion exchange‐high performance thin layer chromatography for the preconcentration,separation, and determination of plasticizers in aqueous samples

Liquid phase microextraction combined with ion‐exchange‐high performance thin layer chromatography has been developed for analysis of four plasticizers in aqueous samples. After their preconcentration by liquid phase microextraction, fast separation on thin layers of inorganic ion‐exchanger stannic silicate has been developed using a mixture of toluene + ethyl acetate (10:1, v/v) as mobile phase. Consequently, densitometric quantitative determination of the plasticizers has been made at λ = 280 nm in reflection–absorption mode by Camag TLC scanner‐3. The effects of type and volume of extraction solvent, stirring rate, extraction time, and ionic strength in the microextraction method have been also evaluated and optimized. The results show that the proposed method provides enhanced accuracy, linear range, LOD, and LOQ, and is very effective for analyzing the target compounds in water samples. Under the optimized conditions, preconcentration factor of 149–279 and extraction efficiency of 31–59% have been obtained. Repeatability (5.67–7.26%) and intermediate precision (6.21–8.17%) were in acceptable range. The relative recovery obtained for each analyte in different water samples was higher than 82.3% at three fortification levels with RSD <7.9%.     

Synthetic inorganic ion exchangers. XI. Preparation,properties and ion-exchange behaviour of zirconium tungstate

Summary Samples of zirconium tungstate have been prepared under different conditions and their physico-chemical properties, composition, IR spectra and cation-exchange behaviour are reported. Separations of a number of metal ions from Bi³⁺ and from Pb²⁺ have been worked out.Part X. Ref. [1].