酚醛型吸附树脂对VB_(12)的吸附性能研究

研究了酚醛型吸附树脂JDW 1、JDW 2 (自制 )和DuoliteS 76 1对VB12 的静态和动态吸附 .结果表明 ,JDW 1对VB12 的吸附量达 84mg g ,明显优于DuoliteS 76 1;吸附VB12 的初始阶段 ,即达到 4 3%～6 9%平衡吸附时 ,吸附速率数据和半经验速率方程很吻合 ;酚醛型吸附树脂等温吸附VB12 的平衡吸附数据符合Langmuir方程 ,相关系数在 0 99以上 ,因此 ,酚醛型吸附树脂吸附VB12 属单分子层吸附 ;在动态条件下 ,用含甲醇 80 %溶液以 1 1BV h来洗脱吸附VB12 的JDW 2 ,在 4 2、6 4个床体积的洗脱率分别是 92 2 0 %、95 93% ,这表明酚醛型吸附树脂具有良好的洗脱性能 ,用含甲醇为 80 %溶液作洗脱剂从JDW 2洗脱VB12 ,效果很好     

酚醛型吸附树脂吸附咖啡因的热力学研究

利用酚醛型吸附树脂JDW－2（自制）和DuoliteS-761对咖啡因的吸附进行了研究，在303－323K和研究的浓度范围内，JDW－2和DuoliteS-761对咖啡因吸附平衡数据符合Freundlich吸附等温方程。Freundlich吸附等温线和等量吸附焓表明：JDW－2和DuoliteS-761对咖啡因吸附是放热过程，我们对咖啡因在JDW－2和DuoliteS-761上的吸附焓，自由能，吸附熵也作了测试，并对吸附行为作了合理解释。     

酚醛型吸附树脂对咖啡因和茶碱吸附性能的研究

用静态和动态方法研究了酚醛型吸附树脂JDW-2和DuoliteS-761对咖啡因和茶碱的吸附行为.结果表明,自制树脂JDW-2对咖啡因和茶碱的吸附性能明显优于DuoliteS-761.树脂的比表面积、含水量、酚羟基的含量与吸附关系密切,尽管JDW-2的比表面积比DuoliteS-761小,但前者比后者具有更高的含水量(42%)和酚羟基含量(3.72mmol/g).在静态条件下,JDW-2吸附咖啡因的速率比DuoliteS-761快,JDW-2树脂对咖啡因和茶碱饱和吸附量分别为246和127mg/g干树脂,而DuoliteS-761树脂对它们的吸附量分别为121和53mg/g干树脂;JDW-2和DuoliteS-761吸附咖啡因的初始阶段是粒扩散控制过程;酚醛型吸附树脂等温吸附咖啡因和茶碱的平衡吸附数据符合Langmuir方程.酚醛型吸附树脂吸附咖啡因和茶碱属单分子层吸附.在动态条件下,1mol/LHCl和40%甲醇溶液以1.5BV/h来洗脱吸附咖啡因的JDW-2,在4～5个床体积的洗脱率分别是88%和93%,而1mol/LHCl和80%甲醇溶液以1.5BV/h来洗脱吸附茶碱的JDW-2,在3～4个床体积的洗脱率分别是91%和96%,表明酚醛型吸附树脂具有良好的洗脱性能,用1mol/LHCl和40%(或80%)甲醇溶液作复合洗脱剂从JDW-2中洗脱咖啡因(或茶碱),效     

酚醛型吸附树脂对茶碱的吸附性能研究

研究了酚醛型吸附树脂对茶碱的静态和动态吸附。结果表明3种树脂对茶碱的吸附量均达117－204mg/g，明显优于DuoliteS-761;酚醛型吸附树脂等温吸附茶碱的平衡吸附数据符合Langmuir方程，相关系数在0．99以上，因此，酚醛型吸附树脂吸附茶碱属单分子层吸附；用1mol/LHCl和W甲醇为80％复合溶液作为吸附树脂的洗脱剂，效果很好。     

酚醛型吸附树脂在非水体系中对吡啶和N,N-二甲基苯胺的吸附性能研究

研究了酚醛型吸附树脂JDW 2在非水体系中对吡啶和N ,N 二甲基苯胺的静态吸附 .由实验结果推论正己烷中树脂对吡啶和N ,N 二甲基苯胺的吸附是以氢键吸附机理为主进行的 ,JDW 2酚醛型吸附树脂在正己烷中 ,等温吸附吡啶和N ,N 二甲基苯胺的平衡吸附数据符合Langmuir方程 ,相关系数在 0 99以上 ,因此 ,酚醛型吸附树脂在正己烷中吸附吡啶和N ,N 二甲基苯胺属单分子层吸附 ;同时对非水体系中乙醇或乙酸乙酯的含量对树脂吸附吡啶和N ,N 二甲基苯胺的影响进行了研究     

酚醛型吸附树脂对水体系中吡啶和N,N-二甲基苯胺的吸附性能研究

研究了酚醛型吸附树脂在水体系中对吡啶和N，N-二甲基苯胺的静态和动态吸附行为．结果表明，在水中树脂对吡啶和N，N-二甲基苯胺的吸附主要以疏水吸附机理进行；吸附吡啶和N．N-二甲基苯胺的初始阶段，即达到38．3～48．9％平衡吸附时，吸附速率数据和半经验速率方程很吻合：酚醛型吸附树脂等温吸附吡啶和N，N-二甲基苯胺的平衡吸附数据符合Langmuir方程，相关系数在0．99以上，酚醛型吸附树脂吸附吡啶和N，N-二甲基苯胺属单分子层吸附：用80％的乙醇溶液作洗脱剂来洗脱吸附吡啶已达饱和的JDW-2树脂，效果是很理想的．在3．6个床体积内洗脱率达91．52％，4．8个床体积内洗脱率达到94．85％。表明酚醛型吸附树脂具有优良的洗脱性能．     

胺基酚醛型吸附树脂对染料废水的吸附与脱色

研究了胺基酚醛型吸附树脂对4种水溶性染料酸性橙II,活性红R-3B、活性黑KN-B、活性翠蓝KN-G的吸附性能。探讨了浓度、温度等因素对染料吸附性能的影响。结果表明,吸附树脂对酸性橙II具有较好的吸附;升高温度有利于吸附;随染料浓度的增大,树脂的吸附量增加。吸附树脂对4种水溶性染料的吸附速率较快,达到吸附平衡所用时间较短。对模拟废水的脱色率均达到了95.7%以上。     

酚醛型吸附树脂吸附VB12的热力学研究

研究了酚醛型附树脂JDW-2对VB12的吸附。在304-322K和研究的浓度范围内，JDW-2对VB12吸附平衡数据符合Freundilch吸附等温方程。Freundilich吸附等温线和等量吸附焓表明：JDW-2对VB12吸附是吸热过程。测试了VB12在JDW-2上的吸附焓、自由能和吸附熵，并对吸附行为作了合理解释。     

茶碱印迹酚醛吸附树脂的研究

采用反相悬浮聚合技术,合成了茶碱模板酚醛吸附树脂和非模板酚醛吸附树脂,比较了两种树脂对茶碱的吸附状况.结果表明.对茶碱的吸附数据符合Langmuir方程,吸附属于单分子层吸附.在一定浓度范围内的吸附数据符合Freundlich方程,表明吸附是优惠吸附.Scatchard分析表明茶碱模板酚醛树脂具有特定的高亲和性吸附位点...     

酚醛型吸附树脂在水体系中对苯胺衍生物的吸附性能

N-甲基苯胺;酚醛型吸附树脂在水体系中对苯胺衍生物的吸附性能;N;N-二甲基苯胺     

Studies on Thermodynamic Properties of Adsorption of Theophylline by Phenolic Resin Adsorbents

In the present work, the equilibrium adsorption of theophylline was studied by phenolic resin adsor-bents: JDW-2 (made by ourselves) and Duolite S-761 within a temperature range of 303--323 K. The experi-mental results show that the Freundlich adsorption law is applicable to the adsorption of theophylline on thetwo adsorbents, the exponents n＞l indicate that they are favorable to the adsorptions; the negative values ofall the isosteric adsorption enthalpies for the theophylline indicate the exothermic process of the adsorption,while the range(10—40 kJ/mol) of their magnitudes manifests the physisorption process; other thermody-namic properties, the free energy changes and the entropy change associated with adsorption have been calcu-lated from the Gibbs adsorption equation and the Gibbs-Helmholtz equation.     

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 behavior of Hg(II), Pb(II), and Cd(II) from aqueous solution on Duolite C-433: a synthetic resin

The adsorption behavior of Hg(II), Pb(II), and Cd(II) on Duolite C-433 synthetic resin has been determined at different temperatures by batch process. The various thermodynamic parameters, such as equilibrium constant K0, free energy DeltaG0, entropy DeltaS0, and enthalpy DeltaH0, have been calculated in order to predict the nature of sorption.     

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.