交联聚苯乙烯吸附树脂的修饰及其对天然皂甙的吸附性能

交联聚苯乙烯氯甲基化后,将氯转化为羟基、氨基、甲氧基、苯氧基、4-羟基苯氧基和4-乙酰苯氧基,合成了不同极性的吸附树脂Ⅰ—Ⅵ。同时由交联聚苯乙烯经Friedel-Crafts酰化反应在其苯环上引入乙酰基,制备了树指Ⅶ。用物理技术和化学方法表征树脂Ⅰ—Ⅶ的结构,然后测定了它们对天然皂甙如甜菊甙和绞股蓝皂甙的吸附量。结果说明,这些树脂亲水性较好,均能吸附天然皂甙,但只有中极性的酮基树脂Ⅵ和Ⅶ的吸附量较大。     

季铵基吸附树脂的合成及其在甜菊式甙提取分离中的应用

研究了由工业二乙烯苯聚合得到的大孔树脂进行氯甲基化的可行性，考察了聚合物孔结构催化剂用量、反应温度和时间等因素对氯甲基化反应的影响，由氯甲基化树脂制备了强极性季铵基吸附剂。并研究了合成的季铵基吸附剂对甜叶菊提取物中甜菊甙及色素的吸附－脱附性能，发现该吸咐剂对甜菊甙与色素的吸附－脱附性能完全不同，因而可用该吸附剂制备高品质的甜菊式。     

中国离子交换与吸附科学技术文摘(1986年)

苯乙烯、二乙烯苯在致孔剂存在下进行悬浮聚合反应制得大孔交联聚苯乙烯,然后进行氯甲基化反应和付氏交联反应,制备了一系列吸附树脂,分别测定了它们的比表面积、孔容、平均孔径等结构性能。实测结果表明,共聚体的交联度、致孔剂的种类和用量对吸附树脂的孔结构性能有明显的影响。     

HNA树脂的合成及对正烷烃中甲醇的吸附性能研究

大孔氯甲基化交联聚苯乙烯经适度二次交联以后再磺化,制得一种对正烷烃中的甲醇具有良好吸附能力的吸附树脂。结果显示,二次交联反应条件和树脂含水量对吸附能力具有较大影响。     

酚羟基修饰的超高交联聚苯乙烯树脂对苯酚吸附及脱附性能的研究

对超高交联聚苯乙烯树脂进行酚羟基修饰得到修饰后的超高交联聚苯乙烯树脂(JN-2),将该树脂与大孔吸附树脂(Amberlite XAD-4)和超高交联树脂(NDA-150)在水溶液中对苯酚进行吸附-脱附性能比较,经过酚羟基修饰的超高交联聚苯乙烯树脂(JN-2)对苯酚的吸附性能有所提高,同时脱附性能明显改善,该树脂可望在含酚废水治理中得到广泛应用.     

低交换量混胺树脂的合成及其对绞股蓝皂甙的吸附性能

高交联聚苯乙烯型树脂S-008(Ⅰ)氯甲基化后,以不同比例的三甲胺/二甲胺混合胺或三甲按/二乙醇胺混合胺胺化,合成了同时含有季铵和叔氨基的混胺树脂Ⅱ-Ⅺ,研究了它们对绞股蓝皂甙的吸附性能,发现树脂的比表面和极性基团对其吸附量均有明显影响,此外,这些树脂对绞股蓝皂甙呈现出一定的吸附选择性和良好的解吸选择性。     

大孔交联聚(对乙烯基苄基苯基醚)树脂对苯酚的吸附机理

由氯甲基化聚苯乙烯合成了大孔交联聚(对乙烯基苄基苯基醚)树脂(简称为苯基醚树脂), 测定了其对正己烷和水中苯酚的吸附等温线, 计算了吸附焓. 同时, 比较了聚(对乙烯基苄甲醚)、苯基醚树脂、聚(对乙烯基苄基对硝基苯基醚)和聚(对乙烯基苄基对甲基苯基醚)对正己烷中苯酚的吸附性能以及氯甲基化聚苯乙烯和苯基醚树脂对水中苯酚、2,3,5-三甲基苯酚和对硝基甲苯的吸附性能. 结果表明, 苯基醚树脂是通过氢键吸附正己烷溶液中苯酚的, 而其对水中苯酚的吸附是基于氢键和疏水作用的协同.     

一种新型除酚吸附树脂的合成及性能研究

用二氯乙烷和硝基苯作溶剂,三氯化铝等作催化剂,使氯甲基化交联聚苯乙烯和苯酚在40—125℃进行Fricdel-Crafts反应。制成一种具有较高比表面和一定极性的吸附树脂。它对废水中苯酚的吸附能力是Amberlite XAD-4树脂的两倍,其动力学性能、应用范围和抗干扰能力也较好,经50次循环使用,性能无明显变化。     

低交换量大孔弱碱树脂的合成、表征及其对绞股蓝皂甙的吸附性能

为筛选适用于天然皂甙分离纯化的吸附树脂,以高交联聚苯乙烯型大孔树脂S-008(Ⅰ)为原料,经氯甲基化和胺化反应,合成了低交换量弱碱树脂(Ⅱ—Ⅴ)。然后,对其结构进行了表征,测定了它们对绞股蓝皂甙的吸附性能。结果说明,胺化试剂与反应条件影响产物树脂的结构,并进而影响产物树脂对绞股蓝皂甙的吸附性能。     

甲氧基修饰的大孔交联树脂对苯酚的吸附机理

由大孔氯甲基化聚苯乙烯合成了含有悬挂醚键的甲氧基修饰的大孔交联树脂.通过化学分析(氯含量的测定)、红外光谱和元素分析等手段,确证甲氧基负载在聚苯乙烯骨架上,负载量为4.10mmol/g.测定了这种树脂对正己烷中苯酚的吸附等温线,表明其对正己烷中苯酚的吸附是放热的,随着温度的升高,吸附量逐渐降低,且吸附等温线可拟合成直线.通过吸附焓的计算、不同条件下吸附等温线的比较以及理论计算等方法,确证氢键是甲氧基修饰的大孔交联树脂吸附正己烷中苯酚的主要驱动力,树脂骨架上负载的醚氧原子与苯酚的酚羟基氢原子形成了强烈氢键.     

SYNTHESES OF POLYSTYRENE RESINS CONTAINING POLYETHER OLIGOMERS AND THEIR EXTRACTION FOR GOLD (Ⅲ)*

Three polystyrene resins containing polyether oligomers as extractants were synthesized andtheir extraction properties were studied. Gold (III) ion could be extracted rapidly by the resins(T_(1/2),相似文献   

Rapid monoclonal antibody adsorption on dextran-grafted agarose media for ion-exchange chromatography

The binding capacity and adsorption kinetics of a monoclonal antibody (mAb) are measured for experimental cation exchangers obtained by grafting dextran polymers to agarose beads and compared with measurements for two commercial agarose-based cation exchangers with and without dextran grafts. Introduction of charged dextran polymers results in enhanced adsorption kinetics despite a dramatic reduction of the accessible pore size as determined by inverse size-exclusion chromatography. Incorporation of neutral dextran polymers in a charged agarose bead results instead in substantially lower binding capacities. The effective pore diffusivities obtained from batch uptake curves increase substantially as the protein concentration is reduced for the resins containing charged dextran grafts, but are much less dependent on protein concentration for the resins with no dextran or uncharged dextran grafts. The batch uptake results are corroborated by microscopic observations of transient adsorption in individual particles. In all cases studied, the adsorption kinetics is characterized by a sharp adsorption front consistent with a shell-progressive, diffusion limited mechanism. Greatly enhanced transport rates are obtained with an experimental resin containing charged dextran grafts with effective pore diffusivities that are 1-9 times larger than the free solution diffusivity and adsorption capacity approaching 300 mg/cm3 of particle volume.     

Bisphenol-A modified hyper-cross-linked polystyrene resin for salicylic acid removal from aqueous solution: adsorption equilibrium, kinetics and breakthrough studies

In this study, a series of bisphenol-A modified hyper-cross-linked polystyrene resins labeled as HJ-L00, HJ-L02, HJ-L04, HJ-L06 and HJ-L08 were synthesized, characterized and evaluated for adsorptive removal of salicylic acid from aqueous solutions. The structural characterization results indicated that the resins possessed predominant micropores/mesopores, moderate specific surface area and a few bisphenol-A groups on the surface. All the bisphenol-A modified hyper-cross-linked resins were effective for removing salicylic acid from aqueous solutions, and sample HJ-L02 had the largest adsorption capacity. The adsorption equilibrium data were correlated by the Freundlich isotherm model, and a positive adsorption enthalpy was obtained. The kinetic data were analyzed with two diffusion models and indicated that the intra-particle diffusion was the sole rate-controlling step in the first stage. The dynamic experimental results showed that the breakthrough point of the HJ-L02 adsorbent was at 90.2 BV (bed volume, 1 BV=10 mL) for a feed concentration of 500.0mg/L of salicylic acid, and 14.0 BV of 1% of sodium hydroxide could completely regenerate the HJ-L02 adsorbent column.     

几种吸附树脂对硝基化合物吸附性能的研究

研究NJ－8、AM－1、Amberlite XAD-4、JX－101 4种吸附树脂对对硝基苯乙酮和对硝基苯甲酸的静态吸附行为。结果表明：江苏南大戈德环保科技有限公司研制的NJ－8和AM－1两种吸附树脂对硝基化合物的吸附效果较好。并研究NJ－8型吸附树脂的动态吸附和脱附行为，结果显示：NJ－8型吸附树脂对对硝基苯甲酸的吸附容量为128mg/g干树脂，对对硝基苯乙酮的吸附容量为383mg/g干树脂。用8%NaOH:乙醇（体积比1：1）洗脱吸附酸的树脂，用甲醇或乙醇洗脱吸附酮的树脂，体积为5BV时，温度分别为333K和313K，脱附率均接近100％。     

Effects of porous polystyrene resin parameters on Candida antarctica lipase B adsorption, distribution, and polyester synthesis activity

Polystyrene resins with varied particle sizes (35 to 350-600 microm) and pore diameters (300-1000 A) were employed to study the effects of immobilization resin particle size and pore diameter on Candida antarctica Lipase B (CALB) loading, distribution within resins, fraction of active sites, and catalytic properties for polyester synthesis. CALB adsorbed rapidly (saturation time 相似文献   

国产大孔吸附树脂浓集分离赤霉素

研究了７种国产大孔吸附树脂对赤霉素的吸附能力,其中Ｓ－８吸附效果较好,赤霉素固／液分配系数为１２．４４,动态吸附容量为４．０６ｍｇ／ｍｌ。８０％丙酮水地赤霉素的洗脱能力较强。用工业赤霉素发酵液进行吸附－解吸实验,分配系数可提高至２５．８８（ＰＨ＝２）,动态吸附容量可提高至１０．０２ｍｇ／ｍｌ,赤霉素收率可达９０％以上,且经吸附－解吸循环,可将发酵液中赤霉素浓缩７倍以上。     

Selective uranium adsorption using modified acrylamide resins

Polymeric matrices composed of N,N′-Methylenebis(acrylamide)/glycidyl methacrylate was prepared and modified producing two resins (GMA/MBA/OH and GMA/MBA/SO₃H). The adsorption of U(VI) ions onto the modified acrylamide resins was studied from synthetic and granite samples. For better understanding around the uranium mineralization and the rock-forming minerals of the hosted granitic rocks, to facilitate the choice of the appropriate ore-processing techniques, it was necessary to identify the mineral composition and the radiometric specifications of the used granitic rock. The synthesized adsorbents revealed a promising selective adsorption toward the U(VI) ions from its bearing solutions even with the competence of other cations.

     

Formation of high-capacity protein-adsorbing membranes through simple adsorption of poly(acrylic acid)-containing films at low pH

Layer-by-layer polyelectrolyte adsorption is a simple, convenient method for introducing ion-exchange sites in porous membranes. This study demonstrates that adsorption of poly(acrylic acid) (PAA)-containing films at pH 3 rather than pH 5 increases the protein-binding capacity of such polyelectrolyte-modified membranes 3-6-fold. The low adsorption pH generates a high density of -COOH groups that function as either ion-exchange sites or points for covalent immobilization of metal-ion complexes that selectively bind tagged proteins. When functionalized with nitrilotriacetate (NTA)-Ni(2+) complexes, membranes containing PAA/polyethylenimine (PEI)/PAA films bind 93 mg of histidine(6)-tagged (His-tagged) ubiquitin per cm(3) of membrane. Additionally these membranes isolate His-tagged COP9 signalosome complex subunit 8 from cell extracts and show >90% recovery of His-tagged ubiquitin. Although modification with polyelectrolyte films occurs by simply passing polyelectrolyte solutions through the membrane for as little as 5 min, with low-pH deposition the protein binding capacities of such membranes are as high as for membranes modified with polymer brushes and 2-3-fold higher than for commercially available immobilized metal affinity chromatography (IMAC) resins. Moreover, the buffer permeabilities of polyelectrolyte-modified membranes that bind His-tagged protein are ~30% of the corresponding permeabilities of unmodified membranes, so protein capture can occur rapidly with low-pressure drops. Even at a solution linear velocity of 570 cm/h, membranes modified with PAA/PEI/PAA exhibit a lysozyme dynamic binding capacity (capacity at 10% breakthrough) of ~40 mg/cm(3). Preliminary studies suggest that these membranes are stable under depyrogenation conditions (1 M NaOH).     

大孔树脂对茄尼醇吸附行为的研究

从6种大孔树脂中筛选出用于茄尼醇分离较好的树脂NKA,并进一步研究了其对茄尼醇吸附行为,结果表明,吸附等温线服从Langmuir方程和Freundlich方程,且吸附过程表现为优惠吸附.在温度为283～313K,吸附量为15～35mg/g的条件下,吸附焓变为-16.20～16.57kJ/mol,自由能变为.3.142～3.459kJ/mol,吸附熵变为-47.43～41.17J/mol.K.NKA树脂对茄尼醇吸附速率较快,吸附过程符合一级吸附动力学方程,吸附过程主要受液膜扩散控制.     

Removal of uranium anionic species from aqueous solutions by polyethylenimine–epichlorohydrin resins

The removal of uranium anionic species from aqueous solutions (initial concentration: 10–2,000 mg/L) by a low- and a high molecular weight polyethylenimine–epichlorohydrin resins was studied in the absence of background electrolytes at initial pH (pH_init) 8 to10. The amount of the sorbed U was determined spectrophotometrically using the Arsenazo III method. The maximum uptake was observed at pH_init 8 using both resins. The maximum uptake capacity observed was 221 and 388 mg U/g for the low- and high molecular weight resin respectively. The uptake data were modeled using a number of 2- and 3- parametric isotherm equations (Langmuir, Freundlich, Langmuir–Freundlich, Toth and Redlich–Peterson). The kinetics of the uranium removal was also studied and modeled using the pseudo-first and pseudo-second order equations. The surface and interior of the resin grains were examined after the sorption experiments by scanning electron microscopy/energy dispersive spectroscopy.