Adsorption of Macroporous Phosphonic Acid Resin for Nickel

Tje adsorption bchavior and mechanism of a novel chelate resin,macroporous phosphonic acid resin（PAR）for Ni（Ⅱ）were imestigated.The stotically saturated adsorption capacity is 64.3mg·g^-1 resin at 298K in HAc-NaAc medium.The Ni（Ⅱ）adsorbed on PAR can be eluted by 0.5mal·L^-1 HCl and the elution percentage reaches 96.6%.The resin can be regenerated and reused without abvious decrease in adsorption capacity.The apparent adsorption rate constant is k298=2.6×10^-5s^-1.The adsorption behavior of PAR for Ni（Ⅱ）obeys the Freundllich isotherm.The thermodynamie adsorption parameters.enthalpy change △H,free energy change △G and entropy change △S of PAR for Ni（Ⅱ）are 3.36kJ·mol^-1,-5.47kJ·mol^-1 and 29.6J·mol^-1·K^-1,respectively.The apparent activation energy is Ea=12.2kJ·mol^-1,The molar coordination ratio of the functional group of PAR to Ni（Ⅱ）is about 4：1.The adsorption mechanism of PAR for Ni（Ⅱ）was examined by a chemical method and IR spectrometry.

ADSORPTION OF MACROPOROUS PHOSPHONIC ACID RESIN FOR INDIUM

The adsorption kinetics and mechanism of a novel chelate resin, macroporous phosphonic acid resin (PAR) for In(III) were investigated. The statically saturated adsorption capacity is 216mg穏-1resin at 298K in HAc-NaAc medium. The apparent adsorption rate constant is k298=4.84?0-5 s-1. The adsorption behavior of PAR for In(III) obeys the Freundlich isotherm. The thermodynamic adsorption parameters, enthalpy change △H, free energy change △G and entropy change △S of PAR for In(III) are 11.5kJ/mol, -12.6kJ/mol and 80.8J/mol稫, respectively. The apparent activation energy is Ea=3.5kJ/mol. The molar coordination ratio of the functional group of PAR to In(III) is about 3∶1.

Adsorption Behavior and Mechanism of Macroporous Phosphonic Acid Resin for Lu^(3+)

The article is based on a research on the adsorption behavior and adsorption mechanism of macroporous phosphonic acid resin (PAR) for Lu 3+ and the influence of the medium’s pH, adsorption temperature, adsorption time, etc on adsorbing Lu 3+ . The best value of medium’s pH to the adsorption of PAR for Lu 3+ was found to be 4.92. The static adsorption maximum capacity of PAR for Lu 3+ is 220?mg·g -1 . The thermodynamic adsorption parameters are respectively ΔH=11.3?kJ·mol -1 , ΔS=46.3?J·mol -1 ·K -1 , ΔG=-2.50?kJ·mol -1 and the apparent activity energy is E_a=31.4?kJ·mol -1 . The adsorption behavior of PAR for Lu 3+ obeys the Freundlich isotherm. The apparent adsorption rate constant is k_ 298 =4.68 ×10 -5 ?s -1 . The coordinate ratio of the functional radical to Lu 3+ is approximately 4∶1. The best eluant is 1.0?mol·L -1 HCl. The adsorption mechanism of PAR for Lu 3+ was separately confirmed by chemical analysis and IR spectra.

Adsorption of copper using macroporous phosphonic acid resin

The adsorption behavior and mechanism of a novel chelate resin, macroporous phosphonic acid resin（PAR） for Cu（Ⅱ） were investigated. The statically saturated Cu（Ⅱ） adsorption capacity is 168 mg/g resin at 298K in HAc-NaAc medium. The Cu（Ⅱ） adsorbed on PAR can be eluted by 1.03.0 mol/L HCl and the elution percentage reaches 100%. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is (k=1.64×10-4 s-1) at 298K. The adsorption behavior of PAR for （Cu（Ⅱ）） obeys the Freundlich isotherm. The thermodynamic adsorption parameters, enthalpy change ΔH, free energy change ΔG and entropy change ΔS of PAR for Cu（Ⅱ） are 11.8 kJ/mol, -2.0 kJ/mol and (46.4 J·mol-1·K-1) respectively. The apparent activation energy is Ea=8.0 kJ/mol. The molar coordination ratio of the functional group of PAR to Cu（Ⅱ） is about 2∶1. The adsorption mechanism of PAR for Cu（Ⅱ） was examined by chemical method and IR spectrometry.

STUDIES ON THE SORPTION OF MACROPOROUS PHOSPHONIC ACID RESIN FOR LANTHANUM

The influences of medium pH sorption temperature, sorption time, etc. on thesorption capacity of macroporous Phosphonic acid resin for La3+ were determined Thesorption rate constant was k298 = 7.64×10-5 s-1. The complex ratio of phosphonicgroups of the resin to La3+ was 3:1. The basic sorption parameters were determinedThe sorption mechanism of macroporous phosphonic acid resin for La3+ was examinedby chemical analysis and IR- spectrometry.

Adsorption Behaviors and Mechanism of Macroporous PhosphonicAcid Resin for Gadolinium

The adsorption behaviors and mechanism of a novel chelate resin, macroporous phosphonic acid resin(PAR)for Gd(Ⅲ)were investigated. The statically and dynamically saturated adsorption capacity is respectively 308 mg·g^(-1)resin and 296 mg·g^(-1)resin at 298 K in HAc-NaAc medium at pH 5.6. Gd(Ⅲ)adsorbed on PAR can be reductively eluted by 0.5～5.0 mol·L^(-1) HCl used as eluant and the elution percentage is up to 94.7% in 1.0 mol·L^(-1) HCl. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k_(298)=3.96×10^(-5) s^(-1). The adsorption behavior of PAR for Gd(Ⅲ) conforms to the Freundlich isotherm. The thermodynamic adsorption parameter, enthalpy change △H of PAR for Gd(Ⅲ)is 22.6kJ·mol^(-1). The apparent adsorption activation energy(Ea)of PAR for Gd(Ⅲ)is 5.0 kJ·mol^(-1). The molar coordination ratio of the functional group of PAR to Gd(Ⅲ)is about 3∶1. The adsorption mechanism of PAR for Gd(Ⅲ)was examined by using chemical method and IR spectrometry.

Studies on Adsorption Behavior and Mechanism of Copper(Ⅱ) onto Amino Methylene Phosphonic Acid Resin

The adsorption behavior and the mechanism of a novel chelate resin, amino methylene phosphonic acid resin(APAR) for Cu(Ⅱ) were investigated. Cu(Ⅱ) was quantitatively adsorbed by APAR in the medium of pH=4 09. The statically saturated adsorption capacity is 181 mg/(g resin). Cu(Ⅱ) adsorbed on APAR can be eluted by 1 0-3 0 mol/L HCl. The rate constant is k 298 =5 58×10 -5 s -1 . The adsorption of Cu(Ⅱ) on APAR follows the Freundlich isotherm. The Δ H of the adsorption is 3 91 kJ/mol. The apparent activation energy is E a=21 4 kJ/mol. The coordination molar ratio of APAR to Cu(Ⅱ) is 1/1. It is shown that the nitrogen and the oxygen atoms in the functional group of APAR coordinate to Cu(Ⅱ).

Adsorption behavior and mechanism of amino methylene phosphonic acid resin for Ag(Ⅰ)

The sorption properties of amino methylene phosphonic resin(APAR) for Ag(Ⅰ) were studied. The amino methylene phosphonic acid resin(APAR) has a good adsorption ability for Ag(Ⅰ) at pH=6.0 in the HAc-NaAc medium. The statically saturated adsorption capacity is 272 mg/g resin, Ag(Ⅰ) adsorbed on APAR can be eluted by 5% (NH2)2CS-0.5 mol/L hydrochloric acid quantitatively. The adsorption rate constants determined under various temperatures are k15℃=3.89×10?5 s?1, k25℃=5.93×10?5 s?1, k35℃=7.59×10?5 s?1, k45℃=9.45×10?5 s?1, respectively. The apparent activation energy of adsorption, Ea is 22.8 kJ/mol, the enthalpy change (?H) of sorption is 17.4 kJ/mol. The adsorption mechanism shows that the functional group of APAR coordinates with Ag(Ⅰ) to form coordination bond, the coordination molar ratio of the functional group of APAR to Ag(Ⅰ) is 1∶1.

Adsorption of Pb^(2+) on macroporous weak acid adsorbent resin from aqueous solutions: Batch and column studies

The adsorption properties of a novel macroporous weak acid resin （D152） for Pb^2＋ were investigated with chemical methods. The optimal adsorption condition of D152 resin for Pb^2＋ is at pH 6.00 in HAc-NaAc medium. The statically saturated adsorption capacity is 527 mg/g at 298 K. Pb^2＋ adsorbed on D152 resin can be eluted with 0.05 mol/L HCI quantitatively. The adsorption rate constants determined under various temperatures are k288 n=2.22×10-5 s^-1, k298 K=2.51 × 10^-5 s^-1, and k308 K= 2.95 × 10^-5 s^-1, respectively. The apparent activation energy, Ea is 10.5 kJ/mol, and the adsorption parameters of thermodynamics are ΔH^Θ=13.3 kJ/mol, ΔS^Θ=119 J/（mol·K）, and ΔG^Θ298 K =-22.2 kJ/mol, respectively. The adsorption behavior of D152 resin for Pb^2＋ follows Langmuir model.

ADSORPTION OF TANNIN ACID ONTO AN AMINATED MACROPOROUS RESIN FROM AQUEOUS SOLUTIONS

A macroporous polymeric adsorbent NG-8 was synthesized with divinylbenzene using conventional suspension polymerization technique. Its aminated product NG-9 was prepared by introducing tertiary amino groups into NG-8 for removal of tannin acid from aqueous solutions. NG-9 could be used directly without a wetting process and had higher adsorption capacity than NG-8, which might be attributed to the enhanced adsorbent-adsorbate interaction due to the tertiary amino groups on the polymeric matrix. The Langmuir equation was successfully employed to describe the adsorption process. The adsorption enthalpy change further validated the uptake of tannin acid on NG-9 to be an enhanced physical adsorption because of the Lewis acid-base interaction. In addition, adsorption kinetic studies testified that the tertiary amino groups on the polymer matrix could decrease the adsorption rate maybe for the hindrance of the tertiary amino groups and water clusters built up.

Studies on the Adsorption of Amino Methylene Phosphonic Acid Resin for Holmium(Ⅲ)

The adsorption behavior and mechanism of a novel chelate resin, amino methylene phosphonic acid resin (APAR) for Ho(Ⅲ) were investigated. The statically saturated adsorption capacity is 258 mg·g^(-1) resin at 298 K in HAc-NaAc medium. The Ho(Ⅲ) adsorbed on APAR can be repeatedly eluted by 3.0 mol·L^(-1) HCl and the elution percentage is as high as 95.8%. The resin can be regenerated and reused without apparent decrease in adsorption capacity. The apparent adsorption rate constant is k_(298)=1.14×10^(-5) s^(-1). The adsorption behavior of APAR for Ho(Ⅲ) obeys the Freundlich isotherm. The thermodynamic adsorption parameter, enthalpy change ΔH of APAR for Ho(Ⅲ) is 11.4 kJ·mol^(-1). The apparent activation energy is E_a=15.8 kJ·mol^(-1). The molar coordination ratio of the functional group of APAR to Ho(Ⅲ) is about 2∶1. The adsorption mechanism of APAR for Ho(Ⅲ) was examined by using chemical method and IR spectrometry.

SORPTION BEHAVIOR AND MECHANISM OF SAMARIUM(III) ON AMINO METHYLENE PHOSPHONIC ACID RESIN

Sm(III) was quantitatively adsorbed by amino methylene phosphonic acid resin (APAR) in the medium of pH=5.0. The statically saturated sorption capacity is 251mg/g·resin. Sm(III) adsorbed on APAR can be reductively eluted by 2.0mol/L HCl. The sorption rate constant is k298= 1.35×10-5s-1. The sorption behavior of APAR for Sm(III) obeys the Freundlich isotherm. The enthalpy change △H of sorption is 24.9kJ/mol. The apparent activation energy is Ea=11.7kJ/mol. The sorption mechanism shows that the nitrogen and oxygen atoms of the functional group of APAR coordinated with Sm(III) to form coordination bond.

Adsorption behavior and mechanism of D113 resin for lanthanum

The sorption properties of macroporous weak acid resin （D113） for La^3＋ ion were studied by chemical analysis and IR spectra. Experimental results indicate that the D113 resin has a good adsorption ability for La^3＋ at pH = 6.0 in the HAc-NaAc medium. The statically saturated adsorption capacity is 273.3 mg/g. Separation coefficients of βLa^3＋/Ce^3＋, βLa^3＋/Gd^3＋, βLa^3＋/Er^3＋, and βLa^3＋/Y^3＋ are 2.29, 3.64, 4.27, and 0.627, respectively. The apparent activation energy of adsorption, Ea is 18.4 kJ/mol, the thermodynamics parameters AH, AS, and AG of sorption are 4.53 kJ/mol, 61.8 J/（mol·K）, -13.9 kJ/mol, respectively. The adsorption behavior of D113 for La^3＋ obeys the Freundlich isotherm. La^3＋adsorbed on resin can be eluted by 2.0 mol/L HCl quantitatively.

Preparation of Macroporous Poly (vinyl alcohol-co-triallyl isocyanurate) Beads Bearing Aminocarboxylic Acid as Functional Groups by Suspension Polymerization

Macroporous poly (vinyl acetate-co-triallyl isocyanurate) beads were prepared with suspension polymerization method. The copolymer beads were then transformed into poly (vinyl alcohol-co-triallyl isocyanurate) by ester exchange reaction. Aminocarboxylic acids were immobilized on the copolymer beads by the esterification of hydroxyl groups with diethyl-lenetriaminepentaacetic bisanhydride. The weak acid exchange capacities, specific surface areas and mean pore diameters of the resultant resin beads were measured.

主成分分析结合Box-Behnken响应面法优选旋覆代赭汤中酚酸类及黄酮类成分纯化工艺

目的优选旋覆代赭汤中酚酸类及黄酮类成分分离纯化工艺。方法以洗脱流速、醇洗体积分数和醇洗体积为考察因素,采用Box-Behnken响应面法设计试验,HPD400型大孔树脂分离纯化旋覆代赭汤中酚酸类(6个)、黄酮类(3个)成分,超高效液相色谱(UPLC)法测定洗脱液中各成分的含量,紫外-可见分光光度(UV-Vis)法测定洗脱液中总黄酮质量分数。通过主成分分析结合Box-Behnken响应面法,评价模型,预测最佳纯化工艺并验证。结果最佳纯化工艺为,流速2.6 mL/min,醇洗体积分数53%,醇洗体积为2.4 BV。经验证,最佳纯化工艺下总黄酮质量分数为(69.33±1.66)%,绿原酸、咖啡酸、异槲皮苷、异绿原酸B、异绿原酸A、1,5-二咖啡奎宁酸、异鼠李苷、异绿原酸C、槲皮素含量分别为(2.67±0.04)μg/mg、(15.34±0.27)μg/mg、(12.36±0.17)μg/mg、(16.01±0.22)μg/mg、(18.25±0.22)μg/mg、(96.24±1.44)μg/mg、(6.85±0.07)μg/mg、(22.55±0.35)μg/mg、(5.78±0.07)μg/mg。结论优选的大孔吸附树脂纯化旋覆代赭汤中酚酸、黄酮类成分工艺稳定可行,可为进一步药效学研究提供参考。

金银花叶同步提取物总黄酮和绿原酸分离纯化研究

研究了乙酸乙酯萃取、大孔树脂分离纯化金银花叶绿原酸和总黄酮的工艺。以金银花叶加压同步提取液为试验样品,经乙酸乙酯萃取,乙酸乙酯层、水层产物分别使用AB-8树脂和D101B树脂分离纯化。结果表明,乙酸乙酯萃取,可以将脂溶性黄酮和水溶性黄酮、绿原酸分离,乙酸乙酯层脂溶性黄酮,遴选出最佳纯化大孔树脂为AB-8树脂,单因素试验优选的工艺参数:上样液pH值为4.0、质量浓度为2.0 mg/mL、流速为2.0 BV/h;解吸液为体积分数80%乙醇溶液、解吸液流速为2.0 BV/h、解吸液体积7.0 BV;水层采用D101B树脂分离纯化绿原酸和总黄酮。同步提取液中绿原酸和总黄酮得到较好地分离和纯化,二步法分离纯化后的产物,绿原酸收率为89.71%,纯度达到61.22%;总黄酮收率为93.45%,纯度达到78.92%。

Separation of gibberellic acid (GA3) by macroporous adsorption resins

The adsorption effects of several macroporousadsorption resins for gibberellic acid (GA3) were investigated.The dynamic adsorption capacity is 58.38 mg/g drybeads for resin R4 and 96.46 mg/g dry beads for resin R5which is consistent with the surface area. Aqueous methanol(50%, V/V) is a good eluent and the yield of GA3 isabove 95%. The concentration of GA3 could increase fivefoldafter an adsorption-elution cycle and this is importantwhen considering further crystallization of GA3 in anindustrial process.

洋甘菊中2种咖啡酰基奎宁酸大孔树脂纯化工艺的优化

目的优化洋甘菊中2种咖啡酰基奎宁酸大孔吸附树脂纯化工艺。方法以2种咖啡酰奎宁酸的吸附率和解吸率为评价指标筛选树脂种类。以吸附率和解吸率为评价指标,筛选最优工艺参数,包括上样液浓度、上样量、吸附速率、水冲洗用量、洗脱剂种类和用量等。结果最佳条件为采用AB-8大孔吸附树脂纯化,药液浓度0.20 g/ml,树脂柱径高比1:6,吸附速率2 BV/h,在此条件下,上柱量达7 BV;吸附好的树脂先用1 BV水洗净,流速5 BV/h,再用3 BV 50%乙醇和1 BV 70%乙醇洗脱活性部位,合并洗脱液,浓缩,干燥既得。结论该工艺稳定可靠,可用于大孔吸附树脂纯化洋甘菊中2种咖啡酰基奎宁酸。

DK-13和DK-3两种大孔弱酸阳离子树脂提取西索米星的吸附热力学和动力学研究

目的采用静态吸附实验考察了DK-13、DK-3两种大孔弱酸阳离子树脂对西索米星的吸附热力学和动力学行为。方法用刚果红分光光度法测定不同温度和不同初始浓度下的吸附等温线和吸附动力学、热力学曲线等。结果两种树脂对西索米星的吸附过程符合Langmuir吸附等温方程(R2>0.998)和拟二级动力学模型(R2>0.995);热力学参数计算结果显示,吉布斯自由能变ΔG、焓变ΔH、熵变ΔS均大于零,说明其吸附过程为非自发吸热的熵增过程。同时,研究还发现DK-13树脂交换带长度为DK-3的5.2倍,表明DK-13树脂适用于固定床而DK-3树脂用于连续离子交换床更有利。结论本研究结果为大孔弱酸阳离子树脂吸附提取西索米星工艺的工业化应用提供了理论指导。

Poly(Ba-co-EGDMA)-g-APBA大孔树脂的制备及对甜菊糖苷分离性能的研究

研究丙烯酸丁酯(Ba)为单体,二甲基丙烯酸乙二醇酯(EGDMA)为交联剂,乙酸丁酯为致孔剂,采用悬浮聚合法合成了Poly(Ba-co-EGDMA)大孔树脂,通过碱水解处理使大孔树脂表面形成羧基,然后采用EDC-NHS化学偶联法将硼酸功能化单体3-氨基苯硼酸(APBA)成功接枝到羧基化树脂表面,得到Poly(Ba-co-EGDMA)-g-APBA大孔树脂并研究其对甜菊糖苷分离性能。实验结果表明,当单体比n(Ba)∶n(EGDMA)=1∶1、NaOH水解溶液的浓度为20%(质量分数)并且水解时间为24 h时,树脂显示出均一、规则的球形,硼元素含量为1.66%,对甜菊糖中STV和RA的选择性达到为10.29,总吸附量为43.14 mg/g,显示出较好的分离性能。