HYDROGEN BONDING IN POLYMERIC ADSORBENTS BASED ADSORPTION AND SEPARATION

After a concise introduction of hydrogen bonding effects in solute-solute and solute-solvent bonding,the design of polymeric adsorbents based on hydrogen bonding ,selectivity in adsorption through hydrogen bonding,and characterization of hydrogen bonding in adsorption and separation were reviewed with 28 references.     

水介质中氢键吸附与疏水吸附协同作用的研究

研究了丙烯酸型树脂(D152)在水、乙醇和正己烷中对苯胺、N-甲基苯胺和N,N-二甲基苯胺的吸附行为.在水中D152树脂对3种吸附质的吸附亲合性随N上甲基数的增加而增大,说明疏水作用是主要的吸附机理,但其吸附焓己超出范德华力的范围而在氢键的键能范围内,故氢键吸附也同时在起作用.在正己烷中,D152树脂对3种吸附质的吸附亲合性随N上甲基数的增加而减小,与水中呈相反的趋势,说明氢键作用是主要的吸附机理.在乙醇中,D152树脂对3种吸附质均无吸附,因为疏水作用和氢键作用均受到的乙醇抑制.在水中,吸附质与树脂间的氢键作用同样受到水的抑制,但氢键吸附却依然存在,说明水介质中氢键吸附和疏水吸附可能存在一种协同作用.在热力学上对水介质中氢键吸附和疏水吸附的协同作用给于合理的解释.     

ADSORPTION OF CAFFEINE BY HYDROGEN DONATING ADSORBENTS BASED ON HYDROGEN BONDING

1. INTRODUCTIONHydrogen bonding is a useful mechanism for adsorptive separation. The low enemy of thisbond ensures reversibility, while the directionality and the short range of this bond conferselectivity. The adsorption of hydrogen donating solutes onto an adsorbent capable of acceptinghydrogenedmberlite XAD-7, an adsorbent consisted of polycarboxylic ester--based onhydrogen bonding has been examined in detail 11-41. However, the adsorption of hydrogenaccepting solutes onto polymeric a…     

ADSORPTION OF DINITROPHENOLS ONTO POLYMERIC ADSORBENTS AND ITS MECHANISM

1 INTRODUCTIONPhenol and many substitUted phenols, such as nitrophenols, chlorophenols and aminophenolset al, are the common organic pollutantS existing in wane water of many chemical plants.Treatment of the wastewater containing phenols is an important project for environmentprotection and has been studied by various methods, such as dialysis ['l, microbial degradation ['1,oxidation l'l, extracting with solvents I4] and adsorption with polymeric adsorbents IS]. Theadsorption method is v…     

几种树脂对西红花糖苷的吸附性能的研究

本文系统研究了硅胶和几种国产吸附树脂对西红花提取物溶液的吸附与洗脱性能，包括树脂的筛选，洗脱剂的选择，并研究了pH，温度和西红花提取物的浓度对西红花提取在SZ－1吸附树脂上的吸附影响，结果表明，SZ－1吸附树脂对西红花提取物的吸附能力较强，洗脱能力为最好，其吸附性能和洗脱性能均优于常用色谱固定相硅胶，SZ－1吸附树脂的静态吸附容量为1．04g/g，动态吸附容量为0．5－0．6g/g，洗脱率可达98％以上，且吸附速度快，易于洗脱和再生。     

树脂对化工废水中有毒有机化合物的吸附作用机理与技术研究

超高交联吸附树脂对多种芳香有机化合物较高的吸附容量主要源于其密集的微孔和双峰孔分布.对大孔吸附树脂及超高交联吸附树脂采用不同极性功能基团进行化学修饰可以制得系列离子交换与吸附双重功能吸附树脂,该类树脂对亲水性有机污染物同时具有疏水、静电、络合等多重作用.丙烯酸酯类吸附树脂在吸附芳香磺酸盐时,树脂的骨架和功能基团对吸附过程都有重要的贡献.     

ADSORPTION OF CAFFEINE BY HYDROGEN DONATING ADSORBENTS BASED ON HYDROGEN BONDING

The adsorption isotherms of caffeine from aqueous solution onto three hydrogen donating adsorbents-hydroxypolystyrene,polystryene-azo-pyrogallol,and D72 resin-were measured.The adsorption enthalpies calculated from the isotherms according to the Clausisu-Clapeyron equation were -24-36kJ/mol,-32-37kJ/mol,and -19-24kJ/mol respectively.These values implied that the adsorption processes were based on hydrogen bonding.Furthermore.the mechanism of the adsorption of caffeine onto D72 resin was studied by IR spectra and the small molecular model experiments,and the results showed that the adsorption of caffeine onto hydrogen donating adsorbents was based on hydrogen bonding.     

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。     

SYNERGISTIC INTERACTIONS ON PHENOL ADSORPTION FROM AQUEOUS SOLUTIONS BY POLYMERIC ADSORBENTS

In this paper, the adsorption behaviors of phenol on polymeric adsorbents (Amberlite XAD4, NDA101, and D301)were investigated in batch system at 293, 303, and 313K, respectively. As the results shown, the adsorption isotherms of phenol on all adsorbents can be well fitted by Langmuir and Freundlich equations, which indicate a favorable and exothermic process. The adsorption capacity on a newly developed aminated adsorbent, NDA101, on which adsorption could be achieved by both hydrogen bonding interaction and π-π interaction, are higher than that on a weak base adsorbent, D301, on which adsorption could be achieved by hydrogen bonding interaction only, and on a nonpolar adsorbent, XAD4, on which adsorption could be achieved by π-π interaction only. The results of this paper indicate that the synergistic effect of some weak interactions, which occur simultaneously would contribute more to the adsorption than that occur individually.     

ADSORPTION OF 4-METHYLANILINE IN AQUEOUS SOLUTION BY BENZOYL-CONTAINING POLYMERIC ADSORBENTS

New polymeric adsorbents (ZH-02, ZH-03) containing benzoyl group for adsorbing and removing 4-methylaniline from its aqueous solutions were prepared. Studies on the isotherms and the comparison of desorption conditions evidenced through the adsorption of 4-methylaniline in water onto ZH-02 and ZH-03, namely that there are chemisorption‘s transitions at a proper higher temperature. Mini-colunm adsorption studies of 4-methylaniline on XAD-4, ZH-02 and ZH-03 at 288 K show that the breakthrough capacities are 2.39, 2.99 and 3.19 mmol/g and the total capacities are 3.45, 3.92 and 4.35 mmol/g, respectively.     

氢键吸附及其展望

本文述及了氢键吸附的一般规律及最新发展情况，提供参考文献27篇。     

氢键吸附树脂的合成及高纯度沙棘叶黄酮的制备

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.     

大孔吸附树脂分离纯化异甘草素的研究

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。     

不同基团修饰的吸附树脂对芳香两性化合物的吸附等温线研究

研究了带有不同功能基团的超高交联吸附树脂NG-10和NJ-99对水溶液中芳香两性化合物氨基苯甲酸的静态吸附性能,并与不带功能基团的吸附树脂CHA-111和XAD-4进行了比较.研究结果表明,树脂NJ-99对水溶液中氨基苯甲酸的吸附能力高于其他树脂.邻氨基苯甲酸在4种树脂上的吸附量均大于对氨基苯甲酸,主要原因是其溶解度小.吸附等温线采用经验的Freundlich方程和理论的Langmuir吸附方程来拟合,在实验所研究的浓度范围内,方程的拟合相关性均很好.     

吸附树脂的色层吸附及其在甜菊甙分离纯化中的应用

研究了ADS－7等吸附树脂对甜菊甙各组分的吸附选择性及色层吸附性能,发现ADS－7吸附树脂不仅在吸附甜菊甙时对各个组分呈现出一定的选择吸附顺序,在水洗时还有一定的选择洗脱顺序,这两个顺序正好相反。利用ADS－7吸对脂的这一色层性能,制备了富含甜度最高、味质最好的Rebaudioside A及几科不含色素的高品质甜菊甙,具有很好的实际应用意义。     

ADSORPTION OF PHENYLACETIC ACID ON MACROPOROUS POLYMERIC ADSORBENTS

Several macroporous polymeric adsorbents(NDA-999,XAD-8,X-5 and XAD-2)were emplyed in the study to adsorb phenylacetic acid from aqueous solution.Effect of salt and ambient temperature on adsorption was studied using NDA-999 adsorbent and the adsorption process conforms to Freundlich′s model reasonably.Adsorption dynamics were conducted in batch experiments in order to make clear the mechanism of adsorption process.It is proved that the squared driving force mass transfer model can be adopted to elucidate the process.The treatment process of industrial wastewater containing high strength of phenylacetic acid was proposed for cleaner production of phenylacetic acid.     

ADSORPTION OF PHENYLACETIC ACID ON MACROPOROUS POLYMERIC ADSORBENTS

1. INTRODUCTION Phenylacetic acid is a common intermediate of pesticide, flavor and medicine. It is generally produced by hydrolysis of benzyl cyanide, but it will destroy the environment and human health seriously due to the toxicity of the raw material…     

BINARY COMPETITIVE AND COOPERATIVE ADSORPTION OF AROMATIC COMPOUNDS ON POLYMERIC RESINS

The adsorption behaviors of 2-naphthalenesulfonic acid and aniline on a conventional macroporous resin Amberlite XAD4 and the other two newly-developed hypercrosslinked resins NDA101 and NDA100 were investigated in a single or binary batch system at 293 K and 313 K,respectively.All the adsorption isotherms of 2-naphthalenesulfonic acid and aniline on the test resins in both systems can fit well with the Langmuir equation,indicating that the adsorption is a favorable process.At the identical equilibrium concentration,the amount of aniline adsorbed on polymeric resins in the single system is higher than that in the binary system because of the competitive adsorption between 2-naphthalenesulfonic acid and aniline on the resin surface.However,the uptake amount of 2-naphthalenesulfonic acid in the binary system is markedly larger than that in the single system,which is presumably due to the cooperative effect arisen from the electrostatic interaction between 2-naphthalenesulfonic acid and aniline adsorbed on the resin surface.The simultaneous adsorption system was proven to be helpful for the selective adsorption toward 2-naphthalenesulfonic acid due to its larger selective index.     

树脂吸附法纯化赤霉素

对比了几种大孔吸附树脂对赤霉素发酵液的吸附、解吸性能,实验发现,自制R4树脂的动态饱和吸附容量高达58.38mg/g干树脂,自制R5树脂的动态饱和吸附容量高达96.46mg/g干树脂,R5树脂的吸附容量明显高于R4,这与树脂的比表面积一致.50%(VIV)甲醇水溶液具有较好的解吸性能,收率高达95%以上,经过树脂一步吸附-解吸,赤霉素的浓度可平均提高5倍以上,集中收集最高可提高15倍以上,这对于工业化生产中,赤霉素的进一步结晶析出具有重要意义.     

大孔吸附树脂分离提取羟丙腈的研究

本文考察了三种大孔吸附树脂对羟丙腈（HPN）的吸附能力，其中NKA－Ⅱ效果较好，表态吸附容量的82.5mg/mL，甲醇是较适宜的洗脱剂。并用动态实验研究了HPN浓度、流速、盐浓度对NKA－Ⅱ树脂吸附能力的影响，将NKA－Ⅱ树脂直接用于丙烯腈水合反应液中羟丙腈的分离提取，回收率高于90％。