共查询到18条相似文献,搜索用时 140 毫秒
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将具有脱色和吸附双重功能的新型吸附树脂用于泽泻提取物的脱色和高纯度泽泻醇提取物的制备工艺中,考察了树脂结构对脱色性能和吸附性能的影响熹见律.结果表明,兼具适宜的比表面积和功能基含量的No.2树脂具有最佳的纯化效果,只通过"吸附-解吸"一步工艺,产品纯度即可从1.93%提高到50%以上,泽泻醇的回收率高于95%.初步探讨了树脂的吸附机理,认为树脂对泽泻醇的吸附是单纯的疏水性作用力,而对色素的吸附应为疏水-离子交换双重作用的协同效应. 相似文献
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针对黄酮分子的酚羟基结构特点,有目的地选择了4种结构不同的商品化树脂,考察了它们对沙棘叶中黄酮类有效成分的吸附能力和吸附选择性.在此基础上优化了树脂结构设计方案,合成了具有氨基功能基、可形成氢键作用、疏水性可调变的大孔吸附树脂.以沙棘叶粗提物为原料,考察了树脂骨架疏水性、功能基间隔臂长短等对树脂纯化效果的影响规律.研究结果表明,当吸附发生在水体系中,一定强度的疏水性作用是树脂与吸附质之间形成氢键的必要条件,对于尺寸较大的黄酮分子,氢键功能基的间隔臂长短也显著影响了树脂对它的吸附能力.最后,我们选择了疏水性和氢键功能基间隔臂长短适宜的XM20-2树脂,对吸附和洗脱条件进行了优化,将其用于沙棘叶粗提物中黄酮类有效成分的进一步纯化,可将黄酮纯度从粗提物中的10.4%提高到50%以上,且树脂具有很好的重复使用性. 相似文献
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聚双甲基丙烯酸乙二醇酯(PEGDMA)大孔吸附树脂是一类含酯基的中极性吸附剂,通过调节致孔剂的种类和比例,制备了一系列均聚PEGDMA及EGDMA-DVB共聚物双酯树脂.用简易BET低温氮吸附法测定了树脂的比表面积.结果表明,甲苯作致孔剂制备的PEGDMA树脂比表面积在单体:致孔剂(体积比)为1:1~1:2时变化不大,甲苯致孔剂量增大所得树脂在各种溶剂中的溶胀率增大;EGDMA-DVB共聚物双酯树脂的比表面积随DVB量增加稍有下降.以苯酚和苹果多酚为吸附质研究了该系列树脂对极性有机分子的吸附行为与吸附机理,静态吸附等温线数据分析结果表明,制备的树脂与2种商品树脂(XAD-7和HP2MG)比较,树脂ED2-T对苹果多酚的平衡吸附量超过了商品树脂,初始浓度Co=1.1935mg/mL时,ED2-T树脂的平衡吸附量为135mg/g,XAD-7和HP2MG分别为113mg/g和120mg/g.树脂对苹果多酚的吸附等温线与Langmuir方程拟合较好,对苯酚的吸附Freundlich方程拟合得更好. 相似文献
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酚醛型吸附树脂对咖啡因和茶碱吸附性能的研究 总被引:9,自引:0,他引:9
用静态和动态方法研究了酚醛型吸附树脂JDW-2和DuoliteS-761对咖啡因和茶碱的吸附行为.结果表明,自制树脂JDW-2对咖啡因和茶碱的吸附性能明显优于DuoliteS-761.树脂的比表面积、含水量、酚羟基的含量与吸附关系密切,尽管JDW-2的比表面积比DuoliteS-761小,但前者比后者具有更高的含水量(42%)和酚羟基含量(3.72mmol/g).在静态条件下,JDW-2吸附咖啡因的速率比DuoliteS-761快,JDW-2树脂对咖啡因和茶碱饱和吸附量分别为246和127mg/g干树脂,而DuoliteS-761树脂对它们的吸附量分别为121和53mg/g干树脂;JDW-2和DuoliteS-761吸附咖啡因的初始阶段是粒扩散控制过程;酚醛型吸附树脂等温吸附咖啡因和茶碱的平衡吸附数据符合Langmuir方程.酚醛型吸附树脂吸附咖啡因和茶碱属单分子层吸附.在动态条件下,1mol/LHCl和40%甲醇溶液以1.5BV/h来洗脱吸附咖啡因的JDW-2,在4~5个床体积的洗脱率分别是88%和93%,而1mol/LHCl和80%甲醇溶液以1.5BV/h来洗脱吸附茶碱的JDW-2,在3~4个床体积的洗脱率分别是91%和96%,表明酚醛型吸附树脂具有良好的洗脱性能,用1mol/LHCl和40%(或80%)甲醇溶液作复合洗脱剂从JDW-2中洗脱咖啡因(或茶碱),效 相似文献
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以废弃的阳离子交换树脂为原料,在不同的炭化温度下,经过炭化活化工序,制备得炭化树脂 (CA).元素分析和红外光谱表明离子交换树脂表面的磺酸基经高温炭化-活化处理后,绝大部分发生热解反应,并生成了一定量的耐热砜基.炭化树脂的BET比表面积可达340.1m2/g.通过水溶液中苯酚吸附实验的初步结果表明,对苯酚的吸附量可达57.60mg苯酚/g炭化树脂,苯酚吸附量和BET比表面积成良好的线性关系;在实验研究的浓度范围内,可以用Langmuir方程很好的拟合吸附平衡数据. 相似文献
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WANG Jun ZHAO Hui WU Fuan YANG Kedi . College of Biological Environmental Engineering Jiangsu University of Science Technology Zhenjiang China . Sericultural Research Institute Chinese Academy of Agricultural Science Zhenjiang China . College of Chemistry Chemical Engineering Guanxi University Nanning China 《离子交换与吸附》2008,(2)
采用大孔吸附树脂法从桑叶水提液中分离黄酮类化合物。通过比较10种大孔吸附树脂对桑叶水提液中总黄酮的吸附特性及机理,发现H103树脂对桑叶总黄酮吸附量大、洗脱容易、吸附速度快,是一种良好的桑叶总黄酮吸附剂。实验表明,H103树脂吸附桑叶黄酮的适宜上样浓度为6.05mg/mL,吸附动力学符合Bangham模型,吸附过程符合内扩散模型。 相似文献
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HUANG Jiangou XU Mancai ** LI Haitao SHI Zuoqing HE Binglin College of Chemistry Chemical Engineering Hunan Normal University Changsha The State Key Laboratory of Functional Polymer Materials for Adsorption Separation Institute of Polymer Chemistry Nankai University Tianjin 《Chinese Journal of Reactive Polymers》2002,(2)
1. INTRODUCTION Adsorption capacity and selectivity are improved when some ion exchange groups or hydrogen bonding acceptor or/and donors are introduced into common polymeric adsorbents [1~5]. R. F. Shi et al have synthesized a series of bifunctional ads… 相似文献
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The adsorption behavior of benzoic acid onto a water-compatible hypercrosslinked polymeric adsorbent NJ-8 wascompared with that onto macroporous Amberlite XAN-4. This paper focuses on the static equilibrium adsorption behaviors,the adsorption thermodynamics and the column dynamic adsorption profiles. Five isotherm models are used to fit the results.This shows that the Freundlich equation can give a perfect fit. The specific surface area of NJ-8 is about as high as that ofAmberlite XAD-4, but the adsorbing capacity for benzoic acid on NJ-8 is about 14.9%-64.8% higher than that on AmberliteXAD-4, which is attributed to its microporous mechanism and partial polarity. The negative values of the adsorptionenthalpy are indicative of an exothermic process. Both enthalpy and free energy changes of adsorption manifest a physicalsorption process. The negative values of the adsorption entropy indicate that adsorption is well consistent with the restrictedmobilities and the configurations of the adsorbed molecules on the surface of the studied adsorbents with superficialheterogeneity. Both adsorbents were used in mini-column experiments to demonstrate the higher breakthrough adsorbing capacity of the hypercrosslinked polymeric adsorbent NJ-8 to benzoic acid, as compared with that of Amberlite XAD-4. 相似文献
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大孔树脂对磺酸类化合物吸附行为的研究 总被引:9,自引:0,他引:9
用4种大孔树脂ND-022,ND-900,NDA-99和NDA-100作为吸附剂,分别对水溶液中甲基磺酸钠、苯磺酸钠、对甲基苯磺酸钠和2-萘磺酸钠等磺酸盐进行吸附.探讨了溶液的初始pH值对不同类型树脂吸附磺酸类物质的影响,并通过动态吸附实验研究了SO4^2-对树脂吸附磺酸盐的影响.实验结果表明,复合功能树脂NDA-99对磺酸类化合物具有良好的吸附性能,且其选择性优于弱碱树脂ND-900,这为进一步研究大孔树脂对磺酸类物质的吸附机理和实际工业应用提供了一定的理论依据。 相似文献
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Three polymeric adsorbents with hydrogen bonding acceptors, methylamine,N-methyl-acetamide and aminotri(hydroxymethyl)methane modified resins are synthesized fromchloromethylated X-5 resin. Adsorption isotherms of phenol and theophylline onto the three modifiedresins and the original X-5 resin from aqueous solution are measured. The results show thatadsorption of compounds with hydrogen bonding donor onto methylamine and N-methylacetamidemodified resins is enhanced as compared with that onto X-5 resin, and adsorption mechanismbetween the adsorbents and the adsorbates is mainly based on hydrogen bonding and hydrophobicinteraction. While adsorption of compounds with hydrogen bonding donor ontoaminotri(hydroxymethyl)methane modified resin is lowered as compared with that onto X-5 resin, andadsorption mechanism between the adsorbent and the adsorbates is mainly based on hydrophobicinteraction. 相似文献
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1.INTRODUCTIONThepolymericadsorbentAmberliteXAD-4isconsideredoneofthemostsuitablepolymericadsorbentsforremovingphenoliccompoundsfromwaterstreams[1,2]becauseitischemicallystable,notsolubleinsolventsandmoreselectiveforaromaticringsduetoitshydrophobicproperties.However,methanol,acetoneoracetonitrile,hastobeusedtoenhancethesurfacecontactbetweenadsorbentandthesolute.DavankovandTsyurupadescribedanewseriesofadsorbents[3,4].Thistechniqueyieldedpolystyrenesorbentsofunusualhypercrosslinkedstructu… 相似文献