大孔吸附树脂对邻甲酚的吸附行为研究

研究了大孔吸附树脂NDA—909吸附水溶液中邻甲酚的热力学特征，并与Amberlite XAD—4树脂进行了比较．通过吸附动力学实验，初步探讨了初始温度对吸附过程的影响。结果表明，NDA—909对邻甲酚的吸附符合Freundlich经验公式，表现为放热的物理吸附过程．此外吸附速率受颗粒内扩散和其它类型扩散的共同控制。     

X-5大孔树脂吸附熊果酸的动力学与热力学特性研究

研究了熊果酸在X-5树脂上吸附的动力学和热力学特性,从物理化学的角度探讨了树脂吸附天然产物的机理。动力学结果表明,在pH=6.36时,熊果酸在X-5树脂上吸附量最大,吸附量为0.1016mmol/g。热力学结果表明,不同温度下熊果酸在X-5树脂上的等温吸附符合Langmuir方程和Freundlich方程,吸附热焓变?Hm=58.77kJ/mol,熵变?Sm=0.23kJ/mol·K,吉布斯自由能?Gm随温度升高向负方向增加。以上热力学参数表明,熊果酸在X-5树脂上的吸附属于自发的物理吸附过程,且在X-5大孔树脂吸附熊果酸过程中,液固界面间增加了随机性吸附。     

大孔树脂对蜘蛛香总酚酸的吸附热力学和动力学研究

通过静态吸附实验,研究大孔吸附树脂对蜘蛛香总酚酸的吸附热力学和动力学特征。结果表明,AB-8树脂对蜘蛛香总酚酸的吸附率和解吸率均为最高;吸附等温线符合Langmuir模型;热力学参数ΔG<0、ΔH<0、ΔS<0,说明其吸附过程为自发、熵减、放热的物理吸附;准二级动力学方程可描述其吸附动力学特征;吸附速率受薄膜扩散和颗粒内扩散的影响,其中薄膜扩散为主要的速率控制步骤。     

大孔吸附树脂对湖南黑茶茶多酚的吸附热力学和动力学研究

以湖南黑茶为原料,采用超声法提取湖南黑茶中茶多酚,后通过静态吸附和解吸实验,对5种大孔吸附树脂进行筛选,研究大孔吸附树脂对湖南黑茶茶多酚的吸附热力学和动力学。结果表明,大孔吸附树脂D-101对湖南黑茶茶多酚有较大的吸附量、较强的解吸能力。大孔吸附树脂D-101对黑茶茶多酚的吸附符合Freundlich等温吸附方程;且ΔH0、ΔG0、ΔS0,表明黑茶茶多酚在大孔吸附树脂D-101上的吸附属于可自发进行的物理吸附,吸附过程为放热、熵减过程。吸附动力学研究结果表明,准二级动力学方程的计算值与实验值吻合较好,适合描述大孔吸附树脂D-101对黑茶茶多酚的吸附过程。     

大孔树脂对红霉素的吸附动力学研究

利用大孔吸附树脂Amberlite XAD16及HZ816对红霉素的吸附动力学实验,研究了温度、初始浓度、溶液pH值及搅拌速度等因素对吸附过程的影响.结果表明,Amberlite XAD16及HZ816对红霉素的吸附速率符合一级吸附动力学方程及颗粒内扩散方程,过程受液膜扩散阻力及颗粒内扩散阻力共同影响.同时,表观吸附速率常数与颗粒内扩散速率常数均随着温度的升高而增大,随着初始浓度的增大而增大,随着溶液pH值增大而增大,随着搅拌速度加快而增大.     

D-101大孔吸附树脂对黄花蒿黄酮的吸附热力学和动力学研究

通过静态吸附实验,研究了D-101大孔吸附树脂对黄花蒿黄酮的吸附热力学和动力学过程。结果表明,当温度在298~318K和在实验研究浓度范围内,D-101大孔吸附树脂对黄花蒿黄酮的吸附符合Freundlich等温吸附方程;ΔG0,吸附过程能自发进行;ΔH0,为放热过程;ΔS0,D-101大孔吸附树脂吸附黄花蒿黄酮的作用大于水的解吸过程,导致熵减。分别采用准一级动力学方程、准二级动力学方程和粒内扩散动力学模型探讨其吸附特性,研究结果表明,吸附过程符合准二级动力学方程,粒内扩散与膜扩散交互控制黄花蒿黄酮在D-101大孔吸附树脂上的吸附。     

3种树脂对水溶液中单宁吸附性能的比较研究

通过静态吸附实验,研究了大孔吸附树脂NG-8、胺基化大孔吸附树脂NG-9和胺基化超高交联大孔吸附树脂NDA-99对水溶液中单宁的吸附行为特性.结果表明,3种树脂对单宁的吸附均符合Langmuir等温吸附方程,树脂对单宁的吸附容量NG-9＞NG-8＞NDA-99;吸附过程符合准二级动力学方程,吸附速率常数NG-8＞NG-9＞NDA-99.树脂的孔结构与表面化学性质是影响树脂吸附性能的重要因素.     

大孔树脂吸附裸花紫珠苯乙醇苷的动力学与热力学研究

考察不同类型大孔树脂吸附裸花紫珠苯乙醇苷的动力学与热力学特性,为该类化合物的分离纯化提供参考。以吸附率、解吸率为综合评价指标,通过静态吸附-解吸附试验从6种大孔树脂中筛选出最适合纯化裸花紫珠苯乙醇苷类成分的大孔树脂类型,建立大孔树脂纯化裸花紫珠苯乙醇苷的吸附动力学模型和等温吸附模型,探究其吸附过程。根据初步筛选结果,选择SP-827、SP-207和X-5型大孔树脂进一步考察,3种树脂具有大致一样的吸附过程：0～60 min为快速吸附阶段;60～360 min为缓慢吸附阶段;360～1080 min为吸附平衡阶段。准二级动力学方程能很好地模拟3种型号的大孔树脂对裸花紫珠苯乙醇苷的吸附动力学过程,吸附速率受液膜扩散和颗粒内扩散共同影响;Langmuir模型和Freundlich模型都能较好地拟合吸附等温线数据,3种类型的大孔树脂对裸花紫珠苯乙醇苷都具有良好的吸附性能,吸附过程属于“优惠吸附”。动力学模型与热力学模型都能很好地拟合这3种类型大孔树脂纯化裸花紫珠苯乙醇苷的吸附过程,其中国产树脂X-5可以用来代替进口树脂SP-825或SP-207用于裸花紫珠苯乙醇苷类成分的分离和纯化研究,也是纯...     

胡芦巴总皂苷在HPD 400A大孔树脂上的吸附性能研究

静态条件下,对胡芦巴中总皂苷在HPD 400A树脂的吸附平衡、吸附动力学、热力学进行了深入探讨,测定了不同温度下胡芦巴中总皂苷在该树脂上的吸附等温线,吸附动力学曲线以及热力学参数。结果表明,Freundlich方程可较好地描述胡芦巴中总皂苷在该树脂上的吸附平衡;吸附动力学规律可用二级速率方程表示,液膜扩散和颗粒内扩散是吸附的主要速率控制步骤,吸附活化能为8.314kJ/mol;热力学参数表明此吸附过程为吸热过程。     

大孔吸附树脂对酯型儿茶素吸附性能的研究

系统研究了AB-8,PA,HPD600,NKA-9,NKA-II等5种大孔吸附树脂对EGCG的吸附性能。结果表明,这5种大孔吸附树脂对EGCG的吸附效率随AB-8,PA,HPD600,NKA-9,NKA-II的顺序依次减小。选择大孔吸附树脂PA为吸附剂,用PA对EGCG、ECG、GCG进行静态和动态吸附实验以及解吸剂的选择实验,研究了吸附速率曲线,确定了最佳吸附流速,根据解吸效果和绿色提取的需要,决定选用无毒有机溶剂C作为解脱剂。     

大孔PMVBS树脂对茶多酚的吸附研究

茶叶在我国具有丰富的自然资源,饮茶及茶文化在我国已有数千年的历史.茶不仅具有提神解渴的功效,而且富含具有保健、药效功能的茶多酚(Tea Polyphenols TP).茶多酚,又名茶单宁,是一类多羟基酚类有机物.     

大孔硫脲螯合树脂吸附银的研究

本文研究了大孔硫脲螯合树脂对银(I)的吸附行为.结果表明:硫脲树脂对银离子的吸附在pH5.0 的HNO3-柠檬酸钠介质中最佳,静态饱和吸附容量为402mg·g-1树脂,用5～10%硫脲-1.0mol·L-1HCl溶液作解吸剂,二次累计解吸率达到92%;等温吸附服从Freundlich经验式;表观吸附速率常数k298=1.64×10-5s-1;吸附反应的△H=41.6kJ·mol-1;吸附物中树脂功能基与Ag(I)的配位比约为1∶ 1.     

Synthesis of the hydrophobic–hydrophilic macroporous poly divinylbenzene/poly(sodium acrylate) IPN resin and adsorption performance for berberine

The macroporous polydivinylbenzene/poly(methyl acrylate) interpenetrating polymer network (PDVB/PMA IPN) was prepared by the sequential suspension polymerization method, and was modified to be hydrophobic–hydrophilic macroporous polydivinylbenzene/poly (sodium acrylate) IPN (PDVB/PNaA IPN) by converting the PMA to PNaA under the condition of base. The effects of different mass ratio of the two networks and different cross‐linking degree of the second network on the pore structure and adsorption capacity of PDVB/PNaA IPN resin were studied. The PDVB/PNaA IPN resin whose adsorption quantity is the biggest was chosen to study further. The pore structure, the weak acid exchange capacity, the water retention capacity, and the swelling ability of PDVB/PNaA IPN resin were measured. The study focused on the adsorption isotherms of berberine at different temperatures. Isosteric adsorption enthalpy, adsorption Gibbs free energies can be calculated according to thermodynamic functions. The results show that the saturated adsorption quantity of berberine is up to 109.4 mg ml^?1 (wet resin) by the way of dynamic adsorption and desorption experiment. The resin could be reused by the mixture with 0.5% sodium chloride and 80% ethanol. On the one hand the hydrophobic PDVB in the PDVB/PNaA IPN resin has the ability of adsorption using π–π interaction, and on the other hand the hydrophilic PNaA in the PDVB/PNaA IPN resin has the ability of adsorption using ion exchange interaction. An important conclusion can be drawn that the PDVB/PNaA IPN resin has a promising application prospect in extracting and separating quaternary ammonium type alkaloids such as berberine. Copyright © 2009 John Wiley & Sons, Ltd.     

大孔吸附树脂对天麻素的吸附与分离特性的研究

研究了AB 8、NKA 9和S 83种大孔吸附树脂对中药天麻提取液中有效成分天麻素的吸附与分离特性。结果表明,NKA 9和S 8树脂对天麻素具有较好的吸附和解吸特性。其中经NKA-9树脂纯化的天麻素纯度为16.4%,比粗提物的天麻素纯度提高了1倍多。     

Separation of capsaicin from capsaicinoids by macroporous resin adsorption chromatography

The aim of present study is to develop an efficient and low‐cost method for capsaicin production isolated from capsaicinoids by macroporous resin adsorption chromatography. HZ816 resin has shown the best adsorption and desorption capacities for capsaicin among other resins. To optimize the operating parameters for separation, initial concentration, diameter‐to‐height ratio, mobile phase ratio, and crystallization method were investigated. When capsaicinoids solution (5 g/L) was loaded onto the column (diameter‐to‐height ratio = 1:12) with ethanol/1% w/w NaOH (4:6, v/v) as the mobile phase, capsaicin was purified most effectively. By using acid neutralization as the crystallization method, the purity of capsaicin improved from 90.3 to 99.5% with 82.3% yield. In conclusion, this study provides a simple and low‐cost method for the industrial‐scale production of high‐purity capsaicin.     

Synthesis of the water-compatible p-acetaminophen resin and its adsorption performances for vanillin in aqueous solution

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.     

Studies on the adsorption behaviors of Pb(II) onto an acyl-thiourea resin

In this paper, an acyl-thiourea resin (PIDTR) was synthesized and its adsorption performances to Pb(II) were investigated by adsorption tests, scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR), and X-ray photoelectron spectroscopy (XPS) analyses. A pH of 6.0 was found to be the optimum pH to obtain the maximum adsorption capacity in 12 hours of equilibration time. The Langmuir model was well fitted to the adsorption data with adsorption capacity of 0.756?mmol?·?g^?1. The adsorption kinetics showed that the adsorption process experienced liquid film diffusion and chemical reaction. The thermodynamic studies indicated that the adsorption for Pb(II) was spontaneous and endothermic. The results of SEM suggested that Pb(II) adsorbed on the surface of PIDTR. The FTIR and XPS analyses further confirmed Pb(II) might chemisorb onto PIDTR surfaces and N–Pb, O–Pb, and S–Pb were formed with the breakage of C?O, C?S, and N-H bonds in the PIDTR molecule.     

DFT study on hydrogen-bonding adsorption mechanism of rutin onto macroporous adsorption resins functionalized with amino, hydroxyl, and carboxyl groups

The adsorption mechanism of a series of macroporous adsorption resins (p-(CH₃NH)PhL (L = NH₂, OH, COOH)) with rutin have been investigated using density functional theory calculations at B3LYP/6-31G(d,p) level of theory. Solvent effects on these species were explored using calculations that included a polarizable continuum model for the aqueous solvent. In this article, the geometry structure, interaction energies and the infrared spectra for the stable reactants and the adsorption complexes were obtained and analyzed. The results show that the hydrogen-bonding have been formed in the adsorption complexes. The higher interaction energy is calculated for the carboxyl group, while the resin with amino group has the highest adsorption capacity for rutin. The adsorption complexes become more and more stable as increasing the number of adsorbents. Our theoretical study is in good explanation for the experimental results.     

大孔树脂吸附黄酒中活性肽的研究

本文采用大孔树脂分离黄酒中的活性多肽,对5种大孔吸附树脂进行了筛选,并对筛选出的DA201-C树脂的吸附解吸条件进行了探究。结果表明:DA201-C具有最佳的吸附率和解吸率,并且在25℃能很好的符合langmuir等温吸附式和Freundlich方程。在上样浓度为3.2mg/mL,洗脱剂为70%乙醇,洗脱流速为1BV/h时,能达到最佳的分离效果,多肽的含量达到66.7%,纯化倍数为9.8。     

大孔吸附树脂的合成及其对黄芩甙的吸附性能

用吸附树脂纯化分离中药黄芩中的黄苓甙是天然药物研究新技术。但吸附树脂交联聚苯乙烯疏水性强,水相与树脂之间的界面能较大,通过氯甲基化引入极性基团可以改善树脂的吸附性能。本文通过对氯甲基化后的交联聚苯乙烯(氯球)进行后交联以改善树脂孔结构,并通过胺化反应增加树脂的极性和亲水性,研究所合成一系列大孔吸附树脂的碱基含量对黄苓甙的静态吸附性能的影响。