LIQUID-PHASE ADSORPTION KINETICS OF ISOMALTOTRIOSE ON Ca~(2+) EXCHANGE RESIN

1. INTRODUCTION Oligosaccharide is a carbohydrate comprising 2~9 monosaccharide units linked together by glucoside bond. In the digestive system of humankind, there exits no enzyme for the hydrolysis of oligosaccharides. So it can be used by bifidobacteria in large intestine, and lead to some special physiological function [1]. Oligosaccharide exits in many plants, for example, Morinda officinalis, a precious herb growing in south China. In this herb, four oligosaccharides with the funct…     

INTERACTION OF AMINO ACID WITH ION EXCHANGE RESIN Ⅲ.FURTHER INVESTIGA TION OF SUPEREQUIVALENT ADSORPTION MECHANISM OF AMINO ACID ON ION EXCHANGE RESIN

The adsorption isotherms of glycine,alanine and oxidized glutathion on strong acid cation and strong base anion exchange resins from aqueous solutions were measured and the superequivalent adsorptions of glycine and alanine observed.The infrared spectra of glycine adsorbed on the cation and the anion exchange resins,001×7 and 201×7,were measured.From these results,it is concluded that the amino acid adsorption on the ion exchange resin proceeds not only through ion exchange and proton transfer mechanisms,but also through aminecarboxylate interaction between the adsorbed amino acid molecules,and the formation of second layer of amino acid molecules is the mechanism of superequivalent adsorption of amino acid,the carboxylate or amine groups of the first layer of amino acid molecules on the ion exchange resin act as the exchange sites for the second layer of amino acid molecules.     

ADSORPTION OF SAMARIUM（III） ON DIGLYCOLAMIDIC ACID RESIN

The sorption behavior and mechanism of a novel chelate resin, diglycolamidic acid resin (DAAR), for Sm(lll) were investigated. The optimal sorption condition of DAAR for Sm(lll) is pH=6.0 in HAc-NaAc medium. The statically saturated sorption capacity is 190mg/g resin at 298K. The Sm(lll) adsorbed on DAAR can be eluted reaching 100% by 0.5-2.0mol/L HCI used as eluant. The resin can be regenerated and reused without apparent decrease of sorption capacity. The apparent sorption rate constant is k298= 1.96×10^-5s^-1. The apparent activation energy is 26kJ/mol. The sorption behavior of DAAR for Sm(lll) obeys the Freundlich isotherm. The thermodynamic sorption parameters, enthalpy change ΔH of DAAR for Sm(lll) is 16.9Kl/mol. The molar coordination ratio of the functional group of DAAR to Sin (111) is 3. The sorption mechanism of DAAR for Sm(lll) was examined by using chemical method and IR spectrometry. The coordination bond was formed between oxygen atoms in the functional group of DAAR and Sin(Ill).     

ADSORPTION OF 1,2,4-ACID BY WEAKLY BASIC RESIN： ISOTHERMS, THERMODYNAMICS AND KINETICS

The adsorption properties, including the adsorption isotherms, thermodynamics and kinetics, of l-amino-2-naphthol-4-sulfonic acid (1,2,4-acid) onto weakly basic resin ND900 are investigated. Both the Langmuir and Freundlich equations can give a good fit to the adsorption isotherms, which indicates an endothermic and a favorable adsorption in our study range. A high yield in elimination of about 45.21%-97.28% is obtained for the tested adsorption systems. The capacity and affinity of the adsorption increase with temperature, due to the phenomena of “solvent-motivated” effects. The value of ΔH is 51.59 kJ/mol, which indicates a chemical adsorption and then expects the poor desorption property of ND900. The negative value of ΔG indicates the spontaneous nature of the adsorption process, and the positive value of ΔS shows the increased randomness at the solid/solution interface during the adsorption process. The value of the adsorption rate constant lower than 0.013 min^-1 is indicative of a slow adsorption rate. The intra-particle diffusion must be one of the rate limiting steps.     

STUDY ON CONTINUOUS ELECTROREGENERATION OF ION EXCHANGE RESIN

ＳＴＵＤＹＯＮＣＯＮＴＩＮＵＯＵＳＥＬＥＣＴＲＯＲＥＧＥＮＥＲＡＴＩＯＮＯＦＩＯＮＥＸＣＨＡＮＧＥＲＥＳＩＮＸｕＴａｉｓｈｕｎ（ＳｈａｎｇｈａｉｉｎｓｔｉｔｕｔｅｏｆＥｌｅｃｔｒｉｃＰｏｗｅｒ，Ｓｈａｎｇｈａｉ２０００９０，Ｃｈｉｎａ）Ａｂｓｔｒａｃ...     

STUDY ON THE DECOLORIZATION OF D—RIBOSE ZYMOTIC FLUID BY RESIN ADSORPTION

In this paper,effects on of six type of resins the decolorization of D-ribose zymotic fluid have been studied for the first time.The results show that resin NKA-II has the best effect.the decolorization rage of D-ribose zymotic fluid is 91% at velocity of 1.0BV/hr and 25℃,the adsorption capacity can reach up to 5.7BV.The effects of adsorption conditions as well as conditions of resinregeneration on the resin decolorization capability were also studied.     

ADSORPTION OF PHENOL AND Pb^2＋ FROM AQUEOUS SOLUTIONS BY A NEW DI-FUNCTION ADSORBENT WITH SULFHYDRYL GROUPS

A new di-function adsorbent （JN-3） was prepared by sulfhydryl modified. Comparing with Amberlite XAD-4 and NDA-150, the equilibrium adsorption for phenol on the JN-3 from aqueous solutions was tested, perfect adsorption capacity was shown. Pb^2＋ can be also removed by JN-3 because of the chelate interaction between sulfhydryl groups and metal ions. This adsorbent could be used in removal of combine pollutants such as phenolic compounds and heavy metal ions from waste streams.     

STUDY ON THE THERMODYNAMIC PROPERTIES OF ADSORPTION OF ETHYL BENZOATE AND DIETHYL PHTHALATE BY PHENOLIC RESIN ADSORBENTS

This paper presents experimental observations on the adsorption of individual solutes by a simple thermodynamic framework, and the equilibrium adsorption of ethyl benzoate and diethyl phthalate on phenolic resin adsorbent in hexane solutions within the temperature range of 293-313 K. The experimental results show that the Freundlich adsorption law is applicable to the adsorption of ethyl benzoate and diethyl phthalate on the adsorbent, since all the correlative factors R‘are larger than 0.99. The negative values of all the isosteric adsorption enthalpies for ethyl benzoate and diethyl phthalate indicate that they undergo exothermic processes, while their magnitudes (19-28 kJ/mol) manifest a hydrogen bonding sorption process. Other thermodynamic properties: the free energy changes and the entropy change associated with the adsorption have been calculated from the Gibbs adsorption equation and the Gibbs-Helmholtz equation.     

ADSORPTION OF GOLD ON TBP EXTRACTING RESIN FROM HCI SOLUTION

Solventextractionandadsorption,asordinarymethodsofretrievinggoldfromwasteliquid,havetheshortcomingsofthedifficultyofsolventrecoveryandlimitingadsorptioncapacityrespectively.Fixingtheextractionsolventinthesmallopeningsoftheadsorptionresintoformtheextractingresin,thentoadsorbsoluteinsolution,partakesofcharacteristicsofbothsolventextractionandad.sorption,remedyingthedefectsoftheabovementionedtwo..th.d.[IJ.Extractingresincontaining50%tributylphosphate(TBP)hasbeenusedinextractionchromatographyfor…     

HPD-100树脂吸附小檗碱的热力学及动力学研究

研究了小檗碱在HPD-100树脂上的吸附热力学和动力学行为。考察了小檗碱在HPD-100树脂上的吸附等温曲线和吸附动力学曲线,确定了吸附过程的热力学及动力学参数。结果表明,HPD-100树脂对小檗碱的等温吸附可采用Langmuir方程描述、吸附为自发进行的放热型物理吸附过程;Dunwald–Wagnen内扩散方程能较好地拟合吸附动力学数据,吸附过程以颗粒内扩散为主要控制步骤,该吸附过程的表观活化能为29.11kJ/mol。本文为HPD-100树脂分离富集小檗碱类生物碱的实际应用提供基础数据及指导。     

717型阴离子交换树脂吸附L-赖氨酸的特性

通过静态吸附实验,考察了溶液中温度、pH值、氯离子浓度对717型阴离子交换树脂吸附L-赖氨酸的影响,并测定了25℃时的吸附等温线。结果表明:717离子交换吸附L-赖氨酸的吸附率随温度的升高呈略下降的趋势,是个放热过程;随着溶液中氯离子浓度的增大L-赖氨酸的吸附率降低,当氯离子浓度达到1.0mol/L时,吸附率仅20%;从含有L-赖氨酸的L-精氨酸溶液中除去L-赖氨酸,最佳pH值为10.5±0.2;717离子交换树脂吸附L-赖氨酸的最大吸附量为30g/kg。     

大孔树脂对红霉素的吸附动力学研究

利用大孔吸附树脂Amberlite XAD16及HZ816对红霉素的吸附动力学实验,研究了温度、初始浓度、溶液pH值及搅拌速度等因素对吸附过程的影响.结果表明,Amberlite XAD16及HZ816对红霉素的吸附速率符合一级吸附动力学方程及颗粒内扩散方程,过程受液膜扩散阻力及颗粒内扩散阻力共同影响.同时,表观吸附速率常数与颗粒内扩散速率常数均随着温度的升高而增大,随着初始浓度的增大而增大,随着溶液pH值增大而增大,随着搅拌速度加快而增大.     

离子交换树脂吸附胞嘧啶核苷三磷酸的动力学和热力学研究

根据CTP在离子交换树脂上的吸附容量和分离因数的大小,确定Duolite A-30树脂适合CTP与CDP及CMP之间的分离.CTP在Duolite A-30树脂上的吸附动力学和热力学研究表明,在283.15～303.15K之间,CTP的质量浓度在7.5g/L以上时,Duolite A-30树脂对CTP的吸附主要受颗粒扩散的控制,其有效扩散系数为D=3.47×10-7cm2/s,溶液的质量浓度≤1.0g/L时,CTP与Duolitc A-30树脂之间的交换速率主要受液膜控制,其液膜扩散系数为Kf=4.112×10-4/s.热力学参数Eα=9.008kJ/mol,△H=5.17kJ/mol·K,△S283.15K=80.28J/mol·K.     

烷基十八胺在离子交换树脂上的吸附及影响研究

研究发现，各种离子交换树脂对烷基十八胺均有较强的吸附作用，阳树脂吸附作用最强，可以近似100％吸附，吸附烷基十八胺后的树脂强度降低，沉降速度改变。常用的无机复苏液无法将吸附的十八胺洗脱出来。     

阴离子树脂D02吸附2-酮基-L-古龙酸的热力学和动力学研究

应用一种新型的阴离子树脂D02直接吸附发酵液中的2-酮基-L-古龙酸.研究了D02树脂对水溶液中2-酮基-L-古龙酸的吸附热力学和吸附动力学特性.热力学研究表明,2-酮基-L-古龙酸在D02树脂上的吸附平衡数据遵循Langmuir吸附等温方程.吸附过程△G＜0,△S＞0,△H＞0,表明此吸附过程吸热,升高温度有利于吸附反应的发生.动力学研究显示,D02树脂对2-酮基-L-古龙酸的吸附过程主要受内扩散控制.     

球形木素基离子交换树脂的合成及其对Cr3+的吸附特性

以木素磺酸钙为原料,利用反相悬浮聚合技术在一种价廉无毒的介质相中制备出球状木质素基离子交换树脂,并讨论了它对Cr3 的吸附性能。结果表明,树脂对低浓度Cr3 的吸附效果好,前期吸附速度快,40min后吸附速率趋缓;升高温度能明显提高前期吸附速率,饱和吸附量约为60mgCr3 /g干树脂,而且树脂在较宽的弱酸性范围内表现出良好的吸附性能。     

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。     

离子交换树脂吸附镉的动力学研究

实验采用离子交换法吸附氯盐体系中的镉,用动态法对2017型强碱性阴离子交换树脂的工作条件进行了优化,在最佳反应体系下,用批式离子交换法研究了温度、溶液浓度和树脂粒径对交换过程的影响,并用动边界模型描述交换过程的动力学,确定了离子交换行为的速度控制步骤为颗粒扩散,并推算出了交换过程的表观活化能、反应级数、速率常数和动力学总方程式。