牛磺酸和甘氨酸在D290树脂上的离子交换平衡

研究了牛磺酸与甘氨酸在阴离子树脂D290上的离子交换平衡.采用静态法分别进行牛磺酸/氢氧根/D290树脂和甘氨酸/氢氧根/D290树脂体系的离子交换平衡实验并测定等温线;在不同的离子强度下进行了牛磺酸/甘氨酸/氢氧根/D290阴离子交换树脂体系的离子交换平衡实验,测定牛磺酸和甘氨酸在碱性条件下的竞争交换平衡等温线.实验结果表明,牛磺酸在D290阴离子交换树脂上的交换量大于甘氨酸的交换量,阴离子交换树脂对牛磺酸和甘氨酸的选择性系数分别为STau-,OH-=2.55,SGly-,OH-=1.65.在牛磺酸/甘氨酸/氢氧根/D290树脂体系中,D290树脂对牛磺酸/甘氨酸/氢氧根3种离子的选择性从高到底顺序是:牛磺酸＞甘氨酸＞氢氧根.树脂对牛磺酸的选择性要大于对甘氨酸的选择性.随着溶液中离子强度的增大,树脂对牛磺酸与甘氨酸之间的选择性下降.     

一种具有亚硝基红盐基团的螯合形成树脂的特性及其应用

有人将亚硝基红盐(NRS)负载在阴离子交换树脂上制得NRS-树脂。本文研究了负载有NRS的D-290大孔强硷性阴离子交换树脂(NRS-树脂)的某些分析特性,并应用该树脂富集基体锌中的微量铜、钴和铁,然后以高氯酸作洗脱剂,用原子吸收光度法测定洗脱液中的Co~(3+)、Cu~(2+)和Fe~(3+),获得满意结果。 (一)试剂和仪器 1.试剂:用常法配制和标定。 2.蔡司AAS-1型原子吸收分光光度计,721型分光光度计。     

D290大孔阴离子交换树脂对W（Ⅵ）、Mo（Ⅵ）吸附性能的研究

本文研究了D290大孔阴离子交换树脂吸附W（Ⅵ）、Mo（Ⅵ）时，酸度、浓度、温度、流速等对吸附量的影响。确证了该种树脂对W（Ⅵ）、Mo（Ⅵ）的偏酸根吸附量大于其正酸根的吸附量，但交换速度慢于后者的交换速度。并研究了在上述诸条件下，D290树脂从溶液中分离钨、钼的方法。     

用偶氮氯膦Ⅰ负载树脂富集微量铀

作者曾报导了用偶氮氯膦I树脂分离富集微量UO_2~(2+)的研究。实验表明,含偶氮氯膦I基团的树脂对UO_2~(2+)有良好的吸附性能,可以从大体积溶液中定量富集微量UO_2~(2+)。为此我们研究了负载有偶氮氯膦I螯合剂的交换树脂的分析特性,并用于富集铀矿废水中微量UO_2~(2+)。实验部分 1.UO_2~(2+)标准溶液:称取一定量乙酸铀溶解于pH_4HAc-NaAc缓冲液中,制取10mg/ml铀标准溶液,临用时再以水稀释至适当浓度。 2.负载偶氮氯膦I树脂制备:称取湿D-290大孔阴离子交换树脂50g,加到含有一定量偶氮氯膦I的溶液中,搅拌,制得含有螯合剂量为75.1μM/g-干树脂的负载树脂(下称负载     

钯/离子交换树脂催化硝基化合物加氢的性能及其结构研究

制备了强酸铁阳离子交换树脂(-SO_2,D72),弱酸性阳离子交换树脂(-COOH,D152), 强碱性阴离子交换树脂[-+~N(CH_3)_2,D290],弱碱性阴离子交换树脂[-N(CH_3)_2,D370]及螯合树脂[-N(CH_2COO-),D401]负载钯催化剂,测定了它们催化硝基化合物加氢的活性,其中D290-Pd的催化活性较好。XPS结果表明,D290-Pd催化剂中钯是与功能基-~+N(CH_3)_3结合而负载于树脂上的,起催化作用的是金属态钯;这就成功地解释了离子交换树脂负载的钯催化剂的功能基效应和配位基效应。     

pH和盐对树脂吸附芳香酸的影响研究

通过三甲胺修饰超高交联聚苯乙烯树脂NJ-00制备了一种新型树脂(NJ-03),树脂性质表征说明,通过改性季胺基被成功引入,树脂骨架上增加了一定数量的碱性基团。研究了pH、盐浓度对芳香酸类化合物在NJ-03树脂上吸附的影响,并与商品大孔强碱阴离子交换树脂D-201以及大孔弱碱阴离子交换树脂D-301进行对比,探讨了pH和盐浓度影响吸附的机理。     

PAR螯合形成树脂特性的研究

我们曾报导了用D-290阴离子树脂与4-(2-吡啶偶氮)-间苯二酚(PAR)制得PAR螯合形成树脂,简称PAR树脂。其形成不同于一般的螯合形成树脂。从而扩大了获得这类树脂的领域。本文对它的特性进行了研究。     

5-Br-PAN-S螯合形成树脂的特性及其分析应用的研究

本文报道了5-Br-PAN-S螯合形成树脂(简称BPS树脂)的制备,研究了D-290树脂吸附5-Br-PAN-S的机理和BPS树脂对Cu~(2 )的吸附速率以及在15℃和25℃下的等温吸附线。建立了采用BPS树脂富集-AAS测定天然水中Cu~(2 )、Zn~(2 )、Cd~(2 )的方法。     

流动注射离子选择电极法自动测定阳离子交换树脂交换容量的研究

基于流动注射离子选择电极法(FIA-ISE)测定痕量Na 原理,建立了一种能自动测定阳离子交换树脂各种交换性能的方法,对影响阳阳离子交换树脂交换容量的各种因素进行考察,筛选出凝胶型强阳离子交换树脂(SACR)交换性能测定的最佳条件:微型交换柱内径3.0mm、长80mm;树脂填充量0.1951g;再生剂HCl浓度为3.0%,其流速为0.90mL/min(7.64m/h),再生剂耗量350mL/g(干树脂);样品为20mg/LNa 溶液,其流速为1.50mL/min;实现了一次测定同时获得SACR的工作交换容量、平衡交换容量、全交换容量、交换速率和树脂利用率。与ASTM法进行对照实验,其结果相关性良好(r=0.9922)。     

用离子交换法从植物水提液中纯化分离左旋多巴的研究

本文比较了D290、D296、D370、D301、201×4、201×7等6种树脂对植物水提液中左旋多巴的静态交换和动态交换性能。筛选出D296用以研究不同pH、不同流速、不同解吸剂对吸附交换或解吸交换的影响。实验结果表明：用此工艺得到的产品，有关质量符合药典要求，收率可达4．0％以上。     

树脂吸附法分离银杏酚酸的研究

采用树脂吸附法分离银杏酚酸，通过对5种不同类型的树脂的筛选，发现D290树脂对银杏酚酸类有较大的吸附量。对D290树脂对银杏酚酸的吸附性能进行了研究，得到了吸附等温线、动力学曲线、穿透曲线，同时对不同浓度的乙酸石油醚溶液对解吸率的影响进行了研究，发现1％的乙酸石油醚溶液洗脱较好，解吸率为95％。     

D-101树脂对胭脂虫红色素吸附特性的研究

绘制了胭脂虫红色素的标准曲线,从9种不同性质的大孔吸附树脂中筛选出D-101树脂用于分离胭脂虫红色素,研究了D-101树脂对胭脂虫红色素吸附动力学曲线和不同温度下的吸附等温线。实验结果表明:胭脂虫红色素溶液浓度与吸光度之间显示良好的线性关系;D-101树脂对胭脂虫红色素的吸附速率快,120min达到平衡,吸附量为143.17mg/g树脂,吸附动力学曲线符合二级吸附动力学模型;D-101树脂对胭脂虫红色素的吸附等温线符合Freundlich方程,低温有利于吸附;通过热力学计算得到H、G、S均小于0,说明吸附是放热过程且能自发进行,吸附后体系趋向有序。研究结果可为胭脂虫红色素的分离提供有益的参考。     

THE EFFECT OF IONIC STRENGTH ON THE UPTAKE OF TAURINE ON A STRONG-BASIC ANION EXCHANGE RESIN

1. INTRODUCTION Taurine (NH2CH2CH2SO3H) is one of the most important amino acids in the human body, and plays an important role in a variety of physiological functions, pharmacological actions and pathological conditions, such as in controlling epilepsy, hypertension and arrhythmia. It is also often used to recover osmotic pressure and promote cerebrum growth [1,2]. As one of amino acids, taurine had the amphoteric characteristic which can be utilized in the ion-exchange technique to e…     

THE EFFECT OF IONIC STRENGTH ON THE UPTAKE OF TAURINE ON A STRONG-BASIC ANION EXCHANGE RESIN

Studied the effect of ionic strength on the uptake of taurine on a strong-basic anionexchange resin. The batch phase equilibrium experiments of ta urine on the anion exchange resin D290 were conducted at different ionic strength, and then the amounts of uptake of taurine on the resin at different pH were determined. The ion exchange mechanisms of taurine on the anion exchange resin at different pH were discussed. Experimental results showed that with increase of the ionic strength of solution, the adsorbed amount of taurine on the resin D290 decreased; Adding small amounts of NaOH or HCl into the system of taurine aqueous solution/D290 anionresin would make the amount of taurine taken up on the resin to decrease due to the competition uptakes of hydroxyl ion with taurine or the decrease in the amount of absorbable zwitterions of taurine in the solution and excluding the cations of taurine from the anion resin.     

Preparation of magnetic anion exchange resin and their adsorption kinetic behavior of reactive blue

Magnetic anion exchange resin(MD-1) was prepared from quaternization of magnetic copolymeric resin(glycidyl methacrylate -eo-divinylbenzene).For comparison,magnetic resin MD-0 without quaternization and non-magnetic resin(D-1) were also synthesized for the adsorption process.It was found that the adsorption was mainly contributed to the chemical interaction between quaternary ammonium groups and reactive blue RXHC.Due to the smaller size,MD-1 had faster adsorption and desorption kinetics than D-1.Coupled with the advantage of easy separation,the magnetic anion exchange resin was considered to be superior to common anion exchange resin in removal of reactive dye.     

偶氮氯膦Ⅲ螯合形成树脂的制备及性质

我们曾用D₂₉₀大孔强碱性阴离子树脂与偶氮氯膦Ⅲ(CPA-Ⅲ)水溶液,经搅拌制得偶氮氯膦Ⅲ螯合形成树脂,以分离富集岩石中微量稀土元素,再用ICP光电直读光谱法测15种稀土元素的分量^[2],结果满意,本文研究了CAP-Ⅲ螯合形成树脂的基本特性。     

Quinoline-8-ol-immobilized Amberlite XAD-4: synthesis,characterization, and uranyl ion uptake properties suitable for analytical applications

Amberlite XAD-4 has been functionalized by coupling it with 5-aminoquinoline-8-ol after acetylation. The resulting resin has been characterized by elemental analysis and IR spectra and has been used for preconcentrating uranyl ions prior to its determination by spectrophotometry. The optimum pH value for quantitative sorption is 4-6, and desorption can be achieved by using 5 mL of 1 mol L(-1) HCl. The sorption capacity of the resin is 11.5 mmol g(-1). The effect of various cations and anions on the preconcentration of uranium in conjunction with the determination procedure has been studied and we have found that none of the ions interfere except thorium. The enrichment factor for preconcentration of uranium was found to be 200. Ten replicate determinations of 40 micro g of uranium present in 1 L of sample gave a mean absorbance of 0.185 with a relative standard deviation of 2.64%. The detection limit corresponding to three times the standard deviation of the bank was found to be 2 micro g L(-1). The validation of the developed preconcentration procedure was carried out by successfully analyzing standard marine sediment reference material. The uranyl content of sediment and soils is estimated by spectrophotometry after its preconcentration with the above chelating resin.