杯[4]芳烃修饰Amberlite XAD-4树脂去除水中双氯芬酸

通过偶氮化反应将合成的去叔丁基杯[4]芳烃连接到Amberlite XAD-4树脂上,并且采用FTIR、SEM和TG/DTA法表征了杯[4]芳烃修饰Amberlite XAD-4树脂的结构.结果表明,水溶液中杯[4]芳烃修饰Amberlite XAD-4树脂对双氯芬酸的去除率远大于单独AmberliteXAD-4树脂和杯[4]芳烃.双氯芬酸的浓度为20mg/L时,随着杯[4]芳烃修饰AmberliteXAD-4树脂投加量的增加,双氯芬酸的去除率增加很快.当吸附剂量增加到80mg/L时,双氯芬酸的去除率为92.8%,并且达到吸附平衡,吸附的双氯芬酸量为34.02mg/g.Langmuir和Freundlich等温线与实验数据均有很好的拟合度.对热力学参数的计算表明,△H与△G负值显示出反应的放热和自发过程.

Amberlite XAD-2000树脂固相萃取富集-火焰原子吸收法测定水中痕量铅

用Amberlite XAD-2000树脂键合8-羟基喹啉固相萃取富集水中痕量铅,然后用火焰原子吸收法测定。实验了pH,样品处理速度,洗脱剂的类型、用量、浓度、处理速度等因素对铅回收率的影响。在最优条件下,树脂对铅的最大吸附量7.2 mg Pb/g树脂,回收率92%;且该方法抗干扰能力强,可用于环境水样检测和干扰离子存在下(如海水中)痕量铅的检测。

Amberlite XAD-2000树脂固相萃取富集-火焰原子吸收法测定水中痕量铜

用8-羟基喹啉螯合Amberlite XAD-2000树脂固相萃取富集水中痕量铜,然后用火焰原子吸收法测定其含量。实验了pH、样品处理速度、洗脱剂的类型、用量、浓度、处理速度等因素对铜回收率的影响。在最优条件下,树脂最大吸附量9.35mg铜/g树脂,回收率96%。实验表明,该方法可用于环境水样检测和干扰离子存在下(如海水中)痕量铜的检测。

盐酸替利定在Amberlite IRP-69上的静态离子交换特性

背景:离子交换树脂分子结构中含有可电离活化的基团,可以与离子性药物交换,使得药物进入其骨架而掩盖不良嗅味。目的:观察盐酸替利定在Amberlite IRP-69上的离子交换平衡特性、热力学及动力学特征。方法;采用静态离子交换法制备盐酸替利定树脂复合物,并进行离子交换平衡特性及动力学特征检测。结果与结论:在293,303,313K3个温度下及研究的浓度范围内,离子交换吸附等温方程、Freundlich方程和Langmuir方程都能够对盐酸替利定在Amberlite IRP-69上的离子交换行为进行很好的拟合。在290,298K下,其离子交换动力学特征基本符合一级动力学方程。盐酸替利定在Amberlite IRP-69上的离子交换热力学参数ΔH>0及ΔS>0,表明该离子交换反应为吸热反应,温度升高有利于反应正向进行,且该反应是熵增加的反应;离子交换自由能变ΔG<0,说明该离子交换反应能够自发进行。初始质量浓度为5g/L的盐酸替利定在Amberlite IRP-69上的平衡交换吸附量为751.88g/L。提示在室温下,可利用一定浓度的盐酸替利定溶液,加入一定量的Amberlite IRP-69作为载体,持续搅拌2h制备药物树脂复合物,进而研制相关制剂。

钠型Amberlite IRC-50树脂分离提取ε-聚赖氨酸的条件优化

采用大孔弱酸钠型阳离子交换树脂Amberlite IRC-50分离纯化发酵液中的ε-聚赖氨酸(ε-poly-L-lysine,ε-PL)。通过对其动态上样条件、洗涤条件和洗脱条件的优化,确定出最佳离子交换工艺:上样pH值为7.0,上样流速5 BV/h;以去离子水作为洗涤剂,洗涤流速2 BV/h;以0.25 mol/L NaOH作为洗脱剂,洗脱流速2 BV/h。在此离子交换操作条件下,钠型Amberlite IRC-50工作交换容量为305.12 mg/g,解吸率在95%以上;ε-PL纯度由24.29%提升至75.26%,ε-PL回收率达到96.40%。

Amberlite XAD-1600吸附树脂精制白芍活性成分的实验研究

目的:探讨白芍乙醇提取物中主要活性成分的提取、分离与精制的方法。方法:采用多聚体吸附树脂Amberlite XAD-1600,分离精制75%乙醇提取物。以芍药苷的含量和抗炎作用为评价指标,比较评价乙醇提取物经XAD-1600处理前后的化学和生物等效性。结果:XAD-1600除去乙醇提取物中杂质的程度达62.75%,同时能有效保留芍药苷,其保留率为98.80%。结论:XAD-1600树脂可有效地分离与精制白芍活性成分。

Amberlite IR-120:一种可重复利用的微波辅助条件下胺类化合物与甲酸N-甲酰化反应的催化剂(英文)

A rapid and practical green route for the N-formylation of amines with formic acid using Amberlite IR-120 as a catalyst is described.This method provides an efficient and much improved modification over the reported methods in terms of yield,reaction time,and work-up procedure.A wide variety of substituents is tolerated,which is not the case for existing procedures.

Behaviour of radioactive iodide and bromide ions from aqueous solution on ion exchange resins Amberlite IRA-400

The ion exchange resin Amberlite IRA-400 in iodide and bromide form where equilibrated separately with the respective labeled iodide and bromide ion solution of different concen-trations varying from 0.005M to 0.100M in the temperature range of 32.0 oC to 48.0 oC. The dis-tribution coefficient Kd values calculated for iodide and bromide ion exchange increases with rise in ionic concentration of the external solution, however with rise in temperature the Kd values calculated where found to decrease. Also the Kd values calculated where higher for iodide exchange than bromide exchange. Among the different alternative techniques available for obtaining the Kd values, the radio-active tracer technique used in the present ex-perimental work offers high detection sensitivity. It is expected that the distribution coefficient data obtained from such experimental work will significant in environmental impact assessment on the disposal of radioactive waste.

Comparison between the protective effects of removing circulatory TNF by specific immunoadsorption and by nonspecific Amberlite XAD-7 adsorption on experimental endotoxin shock

Objective: To compare the protective effects of removingcirculatory TNF by specific immunoadsorption and by nonspeciflc Amberlite XAD-7 adsorption on experimental endotoxin shock. Methods: New Zealand white rabbits receiving a lethal dose of endotoxin underwent hemoperfusion through immunoadsorbent or Amberlite BAD-7. Plasma TNF levels. efficiency of the adsorbents and the survival rate were observed. Results: After 2 h of hemopcrfusion through immunoadsorhent or Amberlite XAD-7. plasma TNF levels were significantly lower than those in the control group(P<0.01). and the best result was shown by immunoadsorption (P<0. 01). The 12 h and 18 h survival rates were 70% and 30% in the immunoadsorption group, and 30% and 5% in the Amberlite XAD-7 group respectively (P<0. 05). Conclusion: Compared with the nonspecific Amberlite XAD-7 adsorption,the specific imrnunoadsorption might be a more effective method of removing circulatory TNF and improve the survival rate in endotoxin shock.

Octa-<i>O</i>-Methoxy Resorcin [4] Arene Amberlite XAD-4 Polymeric Chelating Resin for Solid Phase Extraction, Preconcentration, Separation and Trace Determination of Ni(II), Cu(II), Zn(II) and Cd(II) Ions

Synthetic resin, Amberlite XAD-4 was linked covalently with the third generation supramolecule, octa-O-methoxy resorcin [4] arene through -N=N-group to form chelating resin, which has been characterized and effectively used for the separation and preconcentration of metal ions such as Ni(II), Cu(II), Zn(II) and Cd(II). Critical parameters such as pH, flow rate, sorption capacity, breakthrough studies, distribution coefficient, preconcentration factor, concentration of eluting agents responsible for quantitative extraction of metal ions were optimized. The synthesized resin showed good binding affinity towards Ni(II), Cu(II), Zn(II) and Cd(II) under selective pH conditions. Good breakthrough capacity and fast exchange kinetics of the resin lead to effective separation of metal ions from their binary and ternary mixture by column method on the basis of pH and eluting agents. The resin could be reused for about 8 -10 cycles. The proposed method having the analytical data with the relative standard deviation (RSD) 2% and with recoveries of analytes higher than 98%, reflects upon the reproducibility and reliability of the method which has been successfully applied in the separation and determination of Ni(II), Cu(II), Zn(II) and Cd(II) ions in synthetic, natural and ground water samples.

Studies of Uni-Univalent Ion Exchange Reactions Using Strongly Acidic Cation Exchange Resin Amberlite IR-120

The selectivity behaviour of ion exchange resin Amberlite IR-120 for inorganic cations like sodium and potassium was predicted on the basis of thermodynamic data. The equilibrium constant K values calculated for uni-univalent ion exchange reaction systems were observed to increase with rise in temperature, indicating endothermic ion exchange reactions. From the K values calculated at different temperatures the enthalpy values were calculated. The low enthalpy and higher K values for K+ ion ex-change reaction indicates more affinity of the resin for potassium ions as compared to that for sodium ions also in the solution. The technique used in the present experimental work will be useful in understanding the selectivity behav-iour of different ion exchange resins for ions in the solution. Although the ionic selectivity data for the ion exchange resins is readily available in the literature, it is expected that the informa-tion obtained from the actual experimental trials will be more helpful. The technique used in the present experimental work when applied to dif-ferent ion exchange resins will help in there characterization.

Removal of Chromium(III) from the Waste Solution of an Indian Tannery by Amberlite IR 120 Resin

The extraction of chromium(III) from a model waste solution and also from a waste solution of an Indian tannery with Amberlite IR 120 resin is described, and the performance of this resin is compared with other similar resins. The parameters that were optimized include effect of mixing time, pH, loading and elution behaviours of chromium(III) for this resin. Sorption of chromium(III) on Amberlite IR 120 followed Freundlich isotherm and Langmuir isotherm model, and the maximum sorption capacity was determined to be 142.86 mg Cr(III)/g of the resin. Higher Freundlich constant (Kf) values (6.30 and 13.46 for aqueous feed of 500 and 1000 ppm Cr(III)) indicated strong chemical interaction through ion exchange mechanism of the metal ion with the resin. The kinetic data showed good fit to the Lagergren first order model for extraction of chromium(III). Desorption of chromium(III) from the loaded resin increased with the increase in concentration of eluent (5-20% H2SO4). With 20% (v/v) sulphuric acid solution 94% chromium(III) was eluted in three stages. Elution of the Cr(III) in the column experiments was however, found to be lower (82%) than that of the shake flask data. In case of Indian tannery’s waste solution, it was observed that almost total chromium was extracted in four stages with Amberlite IR 120.

Determination of Some Trace Metals in Environmental Samples by Flame AAS Following Solid Phase Extraction with Amberlite XAD-2000 Resin after Complexing with 8-Hydroxyquinoline

A procedure for preconcentration of Mn（Ⅱ）, Fe（Ⅱ）, Co（H）, Cu（Ⅱ）, Cd（Ⅱ）, Zn（Ⅱ）, Pb（Ⅱ） and Ni（Ⅱ） based on retention of their complexes with 8-hydroxyquinoline （HQ） on Amberlite XAD-2000 resin in a column was proposed for the analysis of environmental samples by flame AAS. Various parameters such as pH, eluent type, volume, concentration, flow rate and volume of sample solution, and matrix interference effect on the retention of the metal ions were investigated. The optimum pHs for the retention of metal complexes in question were about 6 except for Mn^2＋ for whose value is 8. The loading capacity of the adsorbent for these metals and their recoveries from the resin under the optimum conditions were in the range 6.82-9.26 mg·g^-1 and 95%-101%, respectively. The enrichment factor was calculated as 100 and the limit of detection was in the range 0.3-2.2 μg·L^-1 （n=20, blank＋ 3s）. The proposed enrichment method was applied to tap water, stream water and vegetable samples. The validation of the procedure was carried out by analysis of certified reference material and standard addition. The analytes were determined with a relative standard deviation lower than 6% in all samples.

New generation Amberlite XAD resin for the removal of metal ions: A review

The direct determination of toxic metal ions, in environmental samples, is difficult because of the latter＇s presence in trace concentration in association with complex matrices, thereby leading to insufficient sensitivity and selectivity of the methods used. The simultaneous removal of the matrix and preconcentration of the metal ions, through solid phase extraction,serves as the promising solution. The mechanism involved in solid phase extraction（SPE）depends on the nature of the sorbent and analyte. Thus, SPE is carried out by means of adsorption, ion exchange, chelation, ion pair formation, and so forth. As polymeric supports, the commercially available Amberlite resins have been found very promising for designing chelating matrices due to its good physical and chemical properties such as porosity, high surface area,durability and purity. This review presents an overview of the various works done on the modification of Amberlite XAD resins with the objective of making it an efficient sorbent. The methods of modifications which are generally based on simple impregnation, sorption as chelates and chemical bonding have been discussed. The reported results, including the preconcentration limit, the detection limit, sorption capacity, preconcentration factors etc., have been reproduced.

Kinetics and thermodynamics modeling of Nd(Ⅲ) removal from aqueous solution using modified Amberlite XAD7

New adso rbent material was obtained by modification of commercial Amberlite XAD7 with thiourea that represents a non-toxic,cheap and environmentally friendly extractant.Prepared adsorbent was used for removal of neodymium ions from aqueous solutions.Thiourea modified Amberlite involved in this study shows good adsorption capacities(74.3 mg/g) and excellent efficiency during Nd removal process.In order to elucidate the mechanism of the Nd adsorption process kinetic,thermodynamic and equilibrium studies were performed,establishing this way which kinetic model better describes the Nd adsorption process.Moreover the thermodynamic studies prove that the Nd adsorption on thiourea modified Amberlite XAD7 is an endothermic and spontaneous process.

Cu(Ⅱ)高效吸附剂氧化石墨烯/聚亚胺二乙酸树脂的制备

重金属污染已成为水生生态系统面临的巨大挑战。本文采用Amberlite IRC 748树脂对氧化石墨烯(GO)进行改性,制备了一种多功能复合吸附材料(IRC 748-GO)。通过静态吸附和动态吸附实验考察了IRC 748-GO复合材料对Cu^(2+)离子的吸附行为,结果表明该吸附过程符合准二级动力学模型和Langmuir模型,Cu^(2+)的饱和吸附量达到127.22 mg/g,IRC 748-GO复合材料对Cu^(2+)的吸附能力强于氧化石墨烯。采用FT-IR、SEM、XPS和吸附等温线测定分析了吸附机理,结果表明IRC 748-GO复合材料中的羧基能有效螯合Cu^(2+)离子。IRC 748-GO复合材料具有比表面积大、稳定性好、吸附能力强等特点,可用于重金属废水处理。

微型柱现场在线采样技术测定海水中痕量铜

在海水（pH7．8-8．5）条件下，使用微型柱现场在线采样（MFS）技术直接对海水中痕量铜进行预富集，然后在实验室中采用流动注射-火焰原子吸收（FI—FAAS）联用系统成功地实现了对海水中铜的测定．当采样体积为50mL时，其富集因子为432，检出限为0．019μg／L，相对标准偏差为1．68％．对海水中微量元素标准物质GBW（E）080040和大连老虎滩区域海水中的（沁进行分析，均得到满意结果．

罗汉果叶茎根的抑菌活性组分的研究(英文)

目的通过以活性为导向的提取分离的方法,首次研究罗汉果全植株中的抑菌活性组分。方法通过提取得到罗汉果全植株各个部分—果实、叶、茎和根的提取物,然后运用一种快速颜色指示法和血琼脂法研究检测它们的抑菌活性。结果罗汉果的非果实部分及果实对于口腔细菌转糖链球菌S.mutans具有很强的抑菌活性。为了进一步研究并分离活性组分,将其粗提物通过Amberlite XAD树脂进行分离纯化,再通过同样的检测方法进行抗菌活性测定,对有活性的组分通过血琼脂法进行验证。结论罗汉果叶、茎和根(非果实部分)以及果实都具有较强的抑菌活性;罗汉果的非果实部分具有进一步开发为抗菌药物和保健品的潜力。

中空纤维更新液膜萃取回收青霉素G

采用中空纤维更新液膜对青霉素G溶液进行萃取回收.以安伯莱特离子交换树脂(Amberlite LA-2)、正辛醇、煤油作为液膜相,Na_2CO_3溶液作为反萃相,研究了载体浓度、油水比、进料相青霉素G浓度、进料相pH、反萃相pH、两相流率对萃取率的影响,确定了最适操作条件.结果表明:载体Amberlite LA-2浓度为100,mmol/L、油水比为1:20、进料相青霉素G浓度为10,mmol/L、进料相pH为5、反萃相pH为10、管程流速为0.6,cm/s、壳程流速为0.48,cm/s时,青霉素G的萃取率能达到85%,,展现出很好的工业应用前景.

离子交换树脂催化合成马来酸二丁酯动力学研究

为了给DBM(马来酸二丁酯)合成工艺以及二元酯化理论提供参考依据,文中以Amberlite IR-120阳离子交换树脂作为催化剂,采用顺丁烯二酸酐和正丁醇酯化制备了DBM,并推导出该反应的拟均相反应动力学模型(PH模型)、Langmuir-Hinshelwood模型(LHHW模型)和Eley-Rideal模型(ER模型),并与实验数据进行了拟合。研究结果表明,最佳反应条件为醇酐摩尔比为4:1、温度120℃、催化剂质量分数为7.5%(相对反应体系的总质量),酯化率最大可达96%,且对产品样品进行FT-IR分析,结果表明符合DBM的结构。由MATLAB软件分析结果表明,只有正丁醇吸附在催化剂表面的Eley-Ridel模型与实验数据拟合较好,即为顺酐与正丁醇酯化反应的动力学模型。