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大孔阳离子交换树脂对奈替米星的吸附研究 总被引:1,自引:0,他引:1
通过正交实验合成了9种大孔弱酸性阳离子交换树脂,筛选出具有最大动态饱和吸附量的FB-1树脂.采用红外光谱和热重分析的方法对其表征,并研究其对奈替米星的吸附及解吸性能,结果表明:该树脂对奈替米星的吸附符合Langrnuir吸附:用氨水做洗脱剂,0.3mol/L和0.4mol/L的氨水解吸率均达95%以上.FB-1与HD-2树脂比较:动态吸附量FB-1为398.0mg/mL湿树脂、HD-2为232.1mg/mL湿树脂;0.3mol/L氨水解吸,前者解吸率较后者高约15%. 相似文献
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大孔吸附树脂分离纯化异甘草素的研究 总被引:3,自引:2,他引:1
研究大孔吸附树脂分离纯化异甘草素的工艺条件及参数。通过研究HPD-600、D4020、D101、AB-8、NKA-II、AL-2和NKA-9树脂对异甘草素的吸附和解吸附能力,筛选最佳树脂为AB-8,并研究了其对异甘草素的吸附和解吸附性能,确定了最佳的吸附与解吸附工艺参数,吸附:pH=5,室温,流速1.5BV/h,溶液处理量为5BV;脱附:洗脱剂为70%的乙醇溶液,流速1BV/h,洗脱剂用量4.5BV。异甘草素样品溶液经AB-8树脂吸附与脱附后回收率为76.7%,纯度由2.02%提高到29.1%,提高了14.4倍。实验结果表明,AB-8树脂对异甘草素的吸附量大,脱附容易,可以应用于异甘草素的分离纯化。 相似文献
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大孔吸附树脂分离纯化仙人掌中总黄酮的研究 总被引:3,自引:0,他引:3
考察了4种大孔吸附树脂对仙人掌总黄酮的吸附分离性能,筛选出效果最佳的树脂为AB-8。以总黄酮的吸附量、总黄酮含量和回收率为考察指标,采用紫外分光光度法测定总黄酮。确定了AB-8树脂吸附分离仙人掌总黄酮的工艺条件:上样浓度为15mg/mL,仙人掌总黄酮最大吸附量为18.6mg/mL,吸附流速为5mL/min,洗脱剂为70%乙醇,洗脱剂用量为6倍柱体积,树脂可重复使用3次。经AB-8树脂分离纯化后,总黄酮含量从29%提高到76%,总黄酮回收率为86%。实验结果表明,AB-8树脂可用于仙人掌总黄酮的分离纯化。 相似文献
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考察了NKA-9、S-8、XDA-1、AB-8、HPD-100、HPD-600 6种大孔吸附树脂对宁夏枸杞总黄酮的吸附和解吸性能,筛选出XDA-1树脂的效果最佳;考察了pH值、样液浓度、流速等对XDA-1树脂静态吸附效果的影响;并进行了动态吸附试验,确定出XDA-1树脂动态吸附枸杞总黄酮的最佳条件:样品液浓度为0.25mg/mL,控制流速为0.5mL/min,样品液pH 5;最佳洗脱条件:洗脱液为80%的乙醇水溶液,用量为35mL (5倍柱床体积).在此条件下,枸杞总黄酮含量从27.2%提高到79.8%,回收率为87.4%,表明XDA-1树脂可用于宁夏枸杞总黄酮的分离纯化. 相似文献
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大孔吸附树脂对葡萄籽原花青素的吸附研究 总被引:14,自引:0,他引:14
对8种大孔吸附树脂对葡萄籽原花青素的吸附洗脱性能进行了筛选实验,并选择其中几种树脂研究其对葡萄籽原花青素的吸附特性及机理,发现NKA树脂是比较好的吸附剂。 相似文献
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以辛弗林的吸附量、解吸率和所得粉末中辛弗林的含量为指标,从选用的6种大孔吸附树脂中筛选出较好的AB-8树脂。通过静态和动态实验,对辛弗林在AB-8树脂上吸附和解吸的条件进行优化,并考察其吸附等温线、吸附和解吸性能。结果表明,在环境温度约25℃下,使用AB-8树脂纯化辛弗林的较优工艺参数为:上柱液pH值7~8,流速2BV/h,溶液处理量3BV,洗脱剂为20%乙醇,洗脱速度1BV/h,收集洗脱液3BV。按此工艺条件,辛弗林的解吸率为87.2%,3BV洗脱液浓缩干燥后,所得粉末中辛弗林含量为56.6%。 相似文献
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A new method for the determination of adsorption space volume has been proposed, which is applicable to adsorbents with an arbitrary porous structure, including nonporous adsorbents with open surfaces. The method is based on the use of an experimental excess adsorption isotherm measured over a wide range of pressures in the equilibrium gaseous phase (as a rule up to 100–150 MPa) and the absolute adsorption isotherm equation with unspecified parameters in the most general form, given by statistical physics. The method has been tested for a number of adsorption systems, and it has been found that the result was always unambiguous, correct, and stable in the sense of input data.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2381–2385, December, 1995. 相似文献
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Methods for concentrating dilute fluids using adsorption followed by partial thermal regeneration were studied using the simulation package ADSIM. The systems studied were NaCl in liquid water on Amberlite XD-2 resin and benzene vapor in nitrogen on activated carbon. Cycles studied included counter-current regeneration with pure hot fluid, co-current regeneration with pure hot fluid, a new process called Hot Feed Addition (HFA) consisting of co-current regeneration with pure hot fluid followed by hot feed, and cycling zone adsorption (co-current alternating hot and cold feeds with no pure regeneration fluid). The optimum system depends upon the conditions of the system and the value function chosen to evaluate the systems. For example, for benzene in nitrogen with hot regeneration gas at 467.4 K, cycling zone adsorption used no carrier gas, had the most concentrated benzene stream and a very pure nitrogen product, but the energy use was greater than the other processes. For liquid systems counter-current operation could produce the purest product, but regenerant requirements were high. With slightly lower purity requirements HFA reduced solvent usage and increased the concentration of the concentrated waste stream. For the liquid system all processes used approximately 3% or less of the energy that would be required for evaporation. 相似文献
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大孔吸附树脂的吸附机理 总被引:3,自引:0,他引:3
大孔吸附树脂(macroprous adsorption resin, MAR)是近几十年发展起来的一种具有多孔立体结构、人工合成的有机高分子聚合物。由于其特殊的理化性质和吸附性能,已被广泛应用于化学、医药、环保和食品等领域。本文介绍了近年来国内外对大孔吸附树脂在吸附机理研究方面的进展,重点介绍了不同温度条件下大孔吸附树脂对靶标分子的吸附热力学行为模式,靶标分子在大孔吸附树脂表面及孔内的吸附扩散行为模式。此外,大孔吸附树脂性能参数和靶标分子结构参数之间构效关系也对其吸附选择性规律具有重要的影响。因此,大孔吸附树脂与底物间构效关系的匹配程度及其对选择性的影响是大孔吸附树脂分离理论研究的核心。本文最后介绍了可以准确客观描述吸附过程并具有一定使用范围的大孔吸附树脂吸附模型的建立和评价。 相似文献
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氨基酸在固/液界面的吸附作用 总被引:7,自引:0,他引:7
本文介绍了氨基酸在固/液界面吸附等温线的特点,氨基酸液相吸附热力学和活性炭、硅胶、二氧化钛、氧化铝、蒙脱土等自水中吸附氨基酸的机制。 相似文献
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A. V. Tvardovskii 《Russian Chemical Bulletin》1992,41(4):603-607
The Brunauer-Emmett-Teller (BET) and Frenkel-Halsey-Hill equations are shown to be special cases of an equation obtained earlier for interphase equilibrium.Institute of Physical Chemistry, Russian Academy of Sciences, Moscow 117915. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 4, pp. 779–785, April, 1992. 相似文献
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Thermodynamic analysis of the adsorption Temkin isotherm was performed. The equations that describe the dependence of the thermodynamic functions on the amount adsorbed were obtained. A relationship between the excess differential and mean molar thermodynamic functions was found. The thermodynamic approach does not contradict the molecular statistical theory and appears to be more general. 相似文献
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Jan Kornatowski 《Adsorption》2005,11(3-4):275-293
This critical review concerns the author's results and experience in adsorption studies on molecular sieves comprising crystalline
microporous aluminosilicates and aluminophosphates as well as amorphous mesoporous aluminosilicates. The discussion is mainly
based on three distinctly different standard adsorbates: nitrogen, benzene, and water. The highlights or advantages and the
shortcomings or limitations are considered from the points of view of the experimental procedures and expressiveness or concluding.
The results are compared to several other zeolitic materials and adsorbates. Adsorption technique is a valuable tool for characterization
of the molecular sieves. Since the measurements are very sensitive to modification of the materials, the investigations require
sufficiently thorough procedures and the results a careful interpretation. A comparison between the results for larger series
of materials yields valuable conclusions that are much more expressive than those from a single measurement or material.
Dedicated to the memory of Professor Wolfgang Schirmer. 相似文献
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To study the mechanism of physical adsorption of supercritical gases, the adsorption equilibria of N2 on silica gel for 103–298 K using 20 K increments and pressures up to 10 MPa were measured. A transition of the adsorption mechanism was proven on crossing the critical temperature, but the transition way observed is different from that observed with activated carbon. This causes a difference in the locations of the linear section of the n-
g
isotherm at the near-critical temperature. Although the isotherm type is different on silica gel and on activated carbon in the sub-critical region, all isotherms in the supercritical region can be well modeled by a single model. It leads to the argument that the adsorption mechanism of supercritical gases is identical no matter what kind of adsorbent is used. 相似文献