共查询到19条相似文献,搜索用时 101 毫秒
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AASI新型吸附树脂对芳香氨基酸的吸附、洗脱性能研究 总被引:2,自引:0,他引:2
用AASI新型吸附树脂来吸附苯丙氨酸、酪氨酸,研究了pH、温度,溶液中盐浓度对吸附性能的影响以及树脂结构与吸附性能间的关系,计算了树脂BET比表面的有效利用率。 相似文献
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通过静态吸附试验,研究了强碱性树脂IRA-400对富马酸的吸附性能。结果表明,该树脂与弱碱性树脂IRA-94相比,受pH值影响较小,在pH=3.5时,该树脂对富马酸具有较好的吸附性能,其静态饱和吸附容量为1.466mmol/g湿树脂;该树脂对富马酸的吸附等温线符合Freundlich等温方程,在298.15K,308.15K和318.15K下的相关系数R2均大于0.99,方程的特征参数n1,属"优惠吸附";吸附过程ΔG0,ΔS0,ΔH0,表明此反应过程是放热的,自发进行的,降低温度有利于吸附反应的发生;吸附动力学研究表明,IRA-400树脂对富马酸的吸附过程主要受液膜扩散控制。 相似文献
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《高分子通报》2021,(3):38-44
研究了D301和MIEX两种阴离子交换树脂对水中BrO_3~-的吸附性能。结果表明:pH值对两种树脂吸附BrO_3~-的影响相似,两种树脂均在pH为4~9范围时对BrO_3~-的吸附量最大。共存Cl~-、SO_4~(2-)和NO~-_3明显削弱两种树脂对BrO_3~-的吸附,其影响大小顺序为NO~-_3SO_4~(2-)Cl~-。MIEX树脂吸附BrO_3~-仅需4 min达到平衡,D301树脂吸附BrO_3~-需180 min达到平衡,MIEX树脂具有比D301树脂更大的准二级速率常数K_2和颗粒内扩散速率常数K_(id)。BrO_3~-在D301和MIEX两种树脂上的吸附等温线符合Freundlich方程,MIEX树脂对BrO_3~-的吸附量大于D301树脂对BrO_3~-的吸附量。D301和MIEX两种树脂对BrO_3~-的吸附机理为阴离子交换。 相似文献
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大孔交联聚(对乙烯基苄基苯基醚)树脂对苯酚的吸附机理 总被引:1,自引:0,他引:1
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. 相似文献
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通过悬浮聚合的方法,合成了一种聚乙烯吡啶树脂(WH-08).研究了WH-08树脂在不同温度、pH及盐浓度下对苯甲酸的吸附效果.结果表明,Freundlich等温吸附方程能够很好地拟合WH-08树脂吸附苯甲酸的等温线;WH-08树脂对苯甲酸的吸附行为是氢键所致,吸附是一放热过程且能够自发进行.在无机盐存在下,与大孔弱碱树脂D304和强碱性树脂D206相比,WH-08树脂吸附苯甲酸的性能几乎不受无机盐的影响. 相似文献
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研究了经聚苯乙烯氯乙酰树脂(PS-Ace-Cl)制得的PS手性苯丙氨酸树脂(PS-Ace-Phe)对Cu2 的吸附性能,即通过pH、时间、Cu2 浓度等条件的改变,研究了PS-Ace-Phe对Cu2 的吸附,得到了Cu2 的最佳吸附条件:Cu2 溶液浓度为100 mmol/L,pH为6.0~8.5,吸附时间5h,此时吸附效率可达98%,树脂的最高吸附量为2.03 mmol/g,且不同Phe担载量的树脂对Cu2 的吸附率都可大于90%,PS-Ace-Phe对Cu2 的吸附可达近1∶1,说明PS-Ace-Phe对Cu2 的吸附属络合作用.同时得到吸附树脂的稳定存在条件:Cu2 溶液浓度为10mmol/L,pH为2.0~8.0时,该树脂对Cu2 的吸附稳定性可达24h. 相似文献
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以5-氨基水杨酸(ASA)为胺化试剂, 使氯甲基化的交联聚苯乙烯(CMCPS)微球表面的苄氯基团发生亲核取代反应, 制得了水杨酸型螯合树脂ASA-CPS. 研究了该螯合树脂对金属离子的螯合吸附行为, 探讨了其吸附热力学与吸附机理, 考察了介质pH值对树脂螯合吸附性能的影响以及树脂对不同金属离子的螯合吸附能力. 实验结果表明, 水杨酸型螯合树脂ASA-CPS 对重金属离子具有强螯合吸附性能, 尤其对Fe3+离子表现出很强的螯合吸附能力, 常温下吸附容量可达21 g/100 g. 吸附过程属熵驱动的化学吸附过程, 升高温度, 吸附容量增高; 在可抑制金属离子水解的pH范围内, 介质的pH值越高, 螯合吸附能力越强; 对于性质不同的金属离子, ASA-CPS的吸附性能是有差别的, 吸附容量的顺序为Fe3+>Ni2+>Cu2+>Zn2+. 相似文献
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以环氧环己烷作为改性单体,通过环氧氯丙烷与环氧环己烷阳离子开环聚合获得分子量约为3000的共聚醚主链。然后以联苯为介晶基元、亚氨基二乙酸为末端螯合基团,成功合成了一种新型结构的侧链液晶聚醚螯合树脂。在对其结构鉴定以及基础物理性质测定的基础上,系统地研究了该树脂对水中Cu2+吸附的影响因素、再生性能、吸附选择性、吸附模型以及吸附动力学。结果表明,该树脂对Cu2+具有良好的吸附性能、再生性能和选择性,其对水中Cu2+的吸附为Langmuir单分子层吸附,吸附过程符合准二级动力学模型。 相似文献
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阴离子交换树脂固相萃取分离全血中血红蛋白的研究 总被引:1,自引:0,他引:1
以330阴离子交换树脂为吸附材料建立了固相萃取分离血红蛋白的方法。利用血红蛋白和树脂之间的疏水作用力将血红蛋白吸附到树脂上,以Tris—HCl缓冲液(PH-8.9)为洗脱剂回收血红蛋白。考察了溶液PH值、吸附时间、离子强度、洗脱剂的种类及其酸度等对分离纯化效率的影响。在最优实验条件下,树脂对血红蛋白的吸附率和洗脱率分别为87%和70%,吸附容量为42.9μg/mg。吸收光谱和SDS—PAGE凝胶电泳证明,该方法可有效地从人全血中分离出纯度较高的血红蛋白。 相似文献
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A novel p-acetaminophen resin(named as GQ-1) was synthesized with chloromethylated polystyrene and p-acetaminophen.It can be used without any wetting process.The objective of this work was to study the adsorption performances for vanillin onto GQ-1 with two kinds of the hydrogen bond site of acetamino group and hydroxyl group.The results showed that the adsorption property of vanillin onto GQ-1 was superior to XAD-4,H103,NDA150,and NDA88.The adsorption capacity of vanillin onto GQ-1 is not greatly discrepant until the solution pH is higher than 5.31.The saturated adsorption quantity of vanillin was up to 141.32 mg/mL(wet resin) according to the dynamic adsorption and desorption experiments at 293 K.The resin could be regenerated by 7 BV ethanol. 相似文献
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Systematic studies on adsorption of lead on sea nodule residues 总被引:4,自引:0,他引:4
Lead adsorption from aqueous solutions was studied with the aim of detoxifying industrial effluents before their safe disposal onto land or into river waters. Sea nodule residue (SNR), a waste material containing oxides and oxyhydroxides of manganese, iron, silicon, etc., was used as an effective adsorbent for lead in this study. The effect of various parameters such as contact time, initial lead concentration, pulp density, particle size of the adsorbent, pH, and temperature was studied to optimize the conditions for maximum adsorption. Adsorption followed first-order kinetics and 99% of lead adsorption was achieved at a solid:liquid ratio of 1:330, in the pH range 5.5-6.0 at a particle size of -150 microm in 8 h for solution containing 200 ppm lead. The adsorption capacity was found to be 99.0 mg of lead per gram of SNR and the adsorption isotherms followed the Langmuir and Freundlich adsorption models. The mechanism of adsorption of lead onto the sea nodule residue was also investigated. It was possible to reduce the lead level from 25-200 ppm to acceptable levels (0.1 ppm) by adsorption over this solid waste. 相似文献
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LI Xiang GUO Haifu Chemistry Department of Zhaoqing University Zhaoqing China 《Chinese Journal of Reactive Polymers》2006,(2)
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… 相似文献
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The adsorption of isomaltotriose from aqueous solution on Ca2+ resin was investigated.The adsorption isotherm and the rate curve were determined. The pseudo-first-order model,pseudo-second-order model and the intraparticle diffusion model were used to predict the rate constants of adsorption. The activation energy of adsorption has been also evaluated using the pseudo-second-order rate constants. The results showed that the adsorption of isomaltotriose onto Ca2+ resin is an exothermically activated process. The adsorption isotherm can be described by Langmuir equation. The pseudo-second-order model can fit well to the adsorption rate curve of isomaltotriose onto Ca2+ resin. It suggests that the adsorption of isomoltotriose onto Ca2+ resin involve chemical adsorption. 相似文献
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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。 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