用于吸附重金属离子的螯合树脂表面改性研究进展

螯合树脂广泛应用于重金属离子处理。综述了螯合树脂表面改性的研究进展,探讨了各种表面功能基团对螯合树脂吸附容量的影响,分析了几种表面改性方法的特点,为新型螯合树脂的开发和利用提供参考。     

EDTA螯合树脂的结构研究

poly(DVB-co-DBS)经亚氨基二乙酸二乙酯改性,再依次经氢氧化钠醇溶液水解和盐酸酸化,合成EDTA螯合树脂。利用红外光谱研究了poly(DVB-co-DBS)、EDTAE螯合树脂、EDTA螯合树脂的结构,研究了酯化改性时间和酯化改性温度对EDTA螯合树脂的官能团接枝改性的影响。最后用SEM研究了聚二乙烯基苯、poly(DVB-co-DBS)、EDTAE螯合树脂、EDTA螯合树脂的微观形貌。结果表明,亚胺基二乙酸二乙酯与poly(DVB-co-DBS)反应后,亚胺基二乙酸二乙酯的亚胺羧酸官能团成功取代了poly(DVB-co-DBS)结构中的溴原子;EDTA螯合树脂中的羧酸基官能团密度随酯化改性时间的延长和酯化改性温度的升高而增加,最佳时间为40h,最佳改性温度为120℃。EDTA螯合树脂略微发黄,断面显示其结构内部存在微小孔洞。     

螯合树脂吸附金属阳离子的应用及其研究进展

螯合树脂是一类能与金属离子形成多配位络合物的交联功能高分子材料,在处理废水中金属离子的应用十分广泛。介绍了5种不同的螯合树脂分类方法,综述了含有不同官能基团的螯合树脂应用于吸附重金属阳离子的研究现状,并分析讨论了国内常用的螯合树脂及优缺点,进而提出未来螯合树脂用于去除金属阳离子的研究重点。     

D403螯合树脂及其在烧碱装置中的应用

与日本CR-10螯合树脂比较,讨论了D403螯合树脂的性能,重点介绍了D403螯合树脂在锦化集团氯碱股份有限公司的应用情况.     

选择性吸附贵金属离子的螯合树脂的研究进展

树脂矿浆法(RIP)从溶液中提取与分离贵金属是目前的研究热点,其关键是制备高吸附容量和高吸附选择性的螯合树脂。讨论了选择性吸附贵金属离子的螯合树脂的分类方法、树脂结构与性能的关系、树脂与贵金属离子的配位机理,按配位原子分类综述了近10年来国内外螯合树脂的合成和吸附的研究进展,并展望了螯合树脂研究的发展方向。     

单宁基酚胺型螯合树脂的制备及对Cr(Ⅵ)的吸附

杨梅单宁先与氯化亚砜反应制得氯代单宁,再与聚乙烯亚胺交联合成单宁基酚胺型螯合树脂.通过FTIR、SEM、EDS和XPS对单宁基酚胺型螯合树脂的结构进行表征,并考察了螯合树脂对Cr(Ⅵ)的吸附性能.在单宁的分子结构侧链引入氨基,能有效改善单宁基螯合树脂对Cr(Ⅵ)的吸附性能,螯合树脂对Cr(Ⅵ)的吸附主要为还原吸附,铬主...     

盐水二次精制用螯合树脂

一、螯合树脂的结构性能和规格牌号螯合树脂是指带有具有螯合能力的基团,对特定离子具有特殊选择能力的树脂,因此阳离子螯合树脂对盐水中钙、镁、铁等二价阳离子有特殊的吸附能力。 1、螯合树脂的结构盐水精制用的螯合树脂是带有亚胺二乙酸交换基的苯乙烯结构,属二乙酸型螯合树脂,其结构如下:还有一种带有胺基膦酸基的苯乙烯结构的螯合树脂,属胺基膦酸型,例如法国产品Du-oliteES-467树脂,据介绍,在盐水中使     

一种多羟基螯合树脂的合成及其对硼的吸附

以氨基葡萄糖和聚苯乙烯为原料合成新的螯合树脂,检测了螯合树脂的氯含量和红外光谱;然后利用氨基葡萄糖螯合树脂与硼的螯合性质,通过实验研究其对硼的吸附能力,并研究了温度、时间等影响螯合树脂吸附的因素。根据热力学有关原理,计算出树脂吸附硼的热力学数据,从而得出树脂对硼的吸附效果。结果表明:合成的螯合树脂对硼有一定的吸附效果;较高温度有利于吸附,为吸热反应;ΔG小于0,吸附过程可以自发的进行。     

螯合树脂再生废水的处理措施

从螯合树脂再生的实质和螯合树脂再生需要的再生剂用量等方面论述了螯合树脂塔再生后废水利用的可行性、必要性及由此产生的巨大经济效益,并且提供了一种简单可行的改造方法。该改造方法投资少,效果显著。     

螯合树脂及其在检测食品中重金属离子的应用

系统地介绍了新型螯合树脂的概念、分离富集金属离子的原理以及螯合树脂的分类,并对合成型螯合树脂的研究进展及其在食品分析检测领域中分离富集金属离子的应用情况进行了综述。     

国产螯合树脂工业应用可行性分析

介绍了螯合树脂的性能及其在烧碱生产中的作用 ,总结了浙江漂莱特公司等国内几个生产厂家生产的螯合树脂在工业生产中的应用试验情况     

一种简便高效纯化重组D-氨基酸氧化酶的方法

在重组D-氨基酸氧化酶上构建有6个组氨酸标签（6＊Histag）的结构,用螯合了Ni2＋的阳离子树脂FP-IDA可亲和吸附含6＊Histag结构的蛋白,含DAO的酶溶液通过该层析柱时,被吸附在柱上。用低浓度咪唑溶液可洗脱杂酶,再用高浓度咪唑洗脱得到高纯度DAO溶液。用环氧型载体固定化DAO,经头孢菌素C裂解反应检测表明其中的杂酶活力极低,达到工业化要求。     

无“三苯”无“卤代烃”多用途氯丁橡胶胶粘剂的研制

以乙酸甲酯和C型环保油为混合溶剂,以三乙醇胺为非水催化剂,采用酚醛树脂(PF)和活性氧化镁为原料制备螯合物;然后以氯丁橡胶、白炭黑、氧化锌、螯合物和混合溶剂等为原料,制备出一种无"三苯"无"卤代烃"多用途氯丁橡胶胶粘剂。结果表明:该胶粘剂的最佳配方(以质量份计)为氯丁橡胶145份[m(CR2442)∶m(DCR-25)=80∶65],白炭黑20份,氧化锌10份,螯合物120份,混合溶剂700份[m(乙酸甲酯)∶m(C型环保油)=40∶60];由最佳配方制取的氯丁橡胶胶粘剂,其不挥发物含量为23.99%、黏度为2750 mPa·s、初粘剪切强度为1.65 MPa和剪切强度为2.88 MPa,并且其各项性能符合HG/T 3 738-2004标准,其有害物质含量符合GB 18.583-2008标准。     

Effect of Incorporation of Butyl Acrylate–Iron Chelate Resin on the Flammability Properties of Mg(OH)2-LDPE Compositions

Abstract

Butyl acrylate resin–iron chelate was prepared by cross-linking with divinyl benzene and complexation with ferric chloride. The prepared resin was incorporated in different amounts into low-density polyethylene samples filled with magnesium hydroxide. Flammability properties were evaluated by cone calorimetry and thermogravimetric analysis. It was found that the resin–iron chelate has a remarkable effect on the flammability properties of low-density polythylene (LDPE) compositions. Five phr of the new resin decreased the maximum rate of heat release into 835.6 Kw/m² by more that 50%. It was also found that the LDPE composition, sample M3, which contains 15 part per hundred of the prepared resin complied with the category FV2 of the ISO standard 1210. In general the thermal stability of most of LDPE composition was improved.     

Ion‐exchange kinetics based on film theory

The ion‐exchange kinetics in polymer complexes was theoretically formulated. The regeneration of metal species from an ion‐exchange or chelate resin was described as a competitive reaction between metal ions and protons. We considered the ion‐exchange terms and the Langmuir terms to describe the rate of reaction, and film diffusion was also taken into account to describe the profile of the kinetics. In contrast to early methods, the surface concentrations were determined so that the rates of the chemical reactions and diffusion were self‐consistent. Although in the initial stage ion exchange was controlled by diffusion, in the last stage ion exchange was controlled by chemical reactions, particularly under excess acid. The kinetics were supported by experimental data for an iminodiacetic acid chelate resin and amidinourea resins. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39358.     

改性壳聚糖的应用

综述了近些年来改性壳聚糖的应用研究 ,着重介绍了改性壳聚糖在固定化酶膜材料和螯合树脂方面的应用。     

CHKLBTE ION-EXCHANGERS:THE PAST AND FUTURE APPLICATIONS,A USER'S VIEW

ABSTRACT

The paper addresses chelate ion exchange resins which are produced commercially and many others synthesised in comparatively small quantities. Some of the synthetic routes employed and the applicability of the prepared resin are described.

The potential key reasons why more chelate ion exchange resins have not been manufactured are discussed and the future for these materials predicted.     

苯酚/尿素/甲醛(PUF)树脂的研究进展

苯酚/尿素/甲醛(PUF)共缩聚树脂是一种新型的木材用胶粘剂,其固化特性和耐热特性与酚醛树脂(PF)十分相似,但生产成本明显降低。对PUF共缩聚树脂的合成方法、反应机理、固化特性和影响因素等研究进展进行了综述。     

Synthesis of Salicylic Acid-Polystyrene Type Chelate Resin with a New Route

A new route to synthesize salicylic acid-polystyrene type chelate resin is developed. In the presence of Lewis acid catalyst SnCl₄, the chloromethylation reaction of crosslinked polystyrene microspheres (CPS) was first performed using 1,4-bis(chloromethoxy)butane which is un-carcinogenic as a chloromethylation reagent, and the chloromethylated crosslinked polystyrene microspheres (CMCPS) were obtained. Subsequently, the nucleophilic substitution reaction between the benzyl chloride groups on CMCPS microspheres and 5-amino salicylic acid (ASA) was conducted, and chelate resin ASA-CPS was successfully obtained. The effects of main factors on the nucleophilic substitution reaction were examined. The chelating property of the prepared ASA-CPS resin for Fe³⁺ ion was tested preliminarily. The experimental results show that the reaction rate of the nucleophilic substitution reaction between the benzyl chloride groups on CMCPS microspheres and ASA is independent of the concentration of the nucleophilic reagent ASA. Therefore, the reaction is a typical unimolecular substitution reaction, namely, the substitution reaction has a mechanism of S_N1. The solvent with stronger polarity is advantageous to the fracture of C-Cl bond of the benzyl chloride groups, so the polarity of the solvent influences the substitution reaction rate greatly. To increase the reaction temperature also makes for the substitution reaction. The ASA-CPS resin possesses very strong chelating ability towards Fe³⁺ ions by right of the synergism of chelation and electrostatic interaction., and the adsorption capacity can get up to 21 g/100 g.     

溶剂型氯丁橡胶胶黏剂抗潮湿性的研究

以甲苯、乙酸乙酯、高溶解力120#溶剂油为混合溶剂,以三乙醇胺为非水催化剂,采用2402酚醛树脂和活性氧化镁为原料制备螯合物;然后以氯丁橡胶、丁腈橡胶、有机膨润土、白炭黑、螯合物和混合溶剂等为原料,制备出一种溶剂型多用途氯丁橡胶胶黏剂。结果表明:该胶黏剂的最佳配方(以质量份计)为氯丁橡胶70份,丁腈橡胶30份,有机膨润土3份,白炭黑15份,螯合物100份,混合溶剂600份[m(甲苯):m(乙酸乙酯):m(高溶解力120#溶剂油)=20:40:40];由最佳配方制取的氯丁橡胶胶黏剂,其不挥发物含量为22.05%、黏度为3550mPa.s、初黏剪切强度为1.25MPa,剪切强度为1.97MPa,并且其各项性能符合HG/T3738-2004标准,其有害物质含量符合GB18583-2008标准。