磺酸型树脂吸附四环类抗生素的研究

本文研究了几种国产磺酸型阳离子交换树脂对四环类抗生素的吸附过程。结果表明,在一定pH条件下,吸附具有非等当性。结合红外光谱的测定,对吸附机理进行了讨论。结论是,四环类抗生素与磺酸型树脂的相互作用,是通过离子交换和离子转移机理而进行的。     

负载金属离子的磺酸型树脂对酚类成分的吸附

研究了负载金属离子的磺酸型树脂在水、乙醇、乙酸乙酯、正己烷等不同介质中对苯酚、o-苯二酚、m-苯二酚、p-苯二酚、联苯三酚、间苯三酚等酚类成分的吸附性能.结果表明:负载了铜离子的树脂 (D72-Cu2 ) 在正己烷中对苯酚的吸附能力较弱,而对o-苯二酚、m-苯二酚、p-苯二酚、联苯三酚、间苯三酚等具有一定的吸附作用,且随着羟基的数目和空间位置的不同,对上述酚类成分表现出明显的吸附选择性.因此,应用这种具有配位吸附作用的树脂对非水体系中的酚类成分进行吸附分离是可行的,且有望进一步研究将其用于对某些天然活性成分的提取分离.     

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。     

Zn2＋型磺酸树脂对维生素B12的配位吸附及洗脱性能

原位吸附;分离;Zn2＋型磺酸树脂对维生素B12的配位吸附及洗脱性能     

常温常压D072树脂氧化吸附油品脱硫的研究

采用ODS方法,讨论了以D072树脂为催化剂,双氧水为氧化剂脱除汽油中含硫化合物的实验规律。实验采用14 mL汽油,5 g处理后的树脂,一定量H₂O₂,0.1 g Span 60充分搅拌,每30 min监测油品中硫含量,反应2 h后用NMP(N-甲基吡咯烷酮),剂油比为1/2萃取。主要考察反应温度(室温、40 ℃、60 ℃、80 ℃),氧化剂用量(O/S=0、O/S=17、O/S=34)对脱硫效果的影响。结果表明,常温常压下O/S为17时脱硫率最佳,达到75%。     

酚醛型吸附树脂对咖啡因吸附性能的研究

利用 3种自制吸附树脂JDW 1、JDW 2、JDW 3和DuoliteS 761对咖啡因进行了静态和动态吸附研究 .结果发现 3种自制树脂对咖啡因的吸附性能明显优于DuoliteS 761 ;在吸附咖啡因的初始阶段 ,即达到 3 2 %～5 1 %平衡吸附百分率时 ,吸附速率数据和半经验速率方程很吻合 ,证实吸附咖啡因是粒扩散控制过程 ;酚醛型吸附树脂等温吸附咖啡因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咖啡因属单分子层吸附 ;用 1mol LHCl和 40 %的甲醇溶液复合使用 ,效果很好     

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。     

苯甲酰基修饰的吸附树脂对对甲苯胺的吸附机理研究

合成了用苯甲酰基修饰的新型吸附树脂ZH-03和ZH-04,同时研究了它们和AmberliteXAD-4对不同温度下水溶液中对甲苯胺的静态吸附和脱附性能,并对吸附机理进行了探讨。结果表明,经化学修饰后的树脂ZH-03和ZH-04对水溶液中对甲苯胺的吸附过程在合适温度时存在化学络合吸附作用,对吸附剂进行苯甲酰基修饰可以提高吸附剂对水溶液中对甲苯胺的吸附容量。     

330阴离子交换树脂对草甘膦的吸附性能

采用静态吸附法研究了330阴离子交换树脂对水中草甘膦的吸附性能,并研究了吸附动力学;测定了溶液的pH值、温度、NaCl含量等因素对330树脂吸附草甘膦的影响.结果表明:330树脂对水中草甘膦的吸附速率快;在pH=2.69时对草甘膦的吸附性能最好;330树脂对草甘膦的吸附是放热、自发的过程,吸附等温线符合Freundli...     

Adsorptive desulfurization of diesel with mesoporous aluminosilicates

Mesoporous aluminosilicates (MAS) bearing microporous zeolite units and mesoporous structures were synthesized by the hydrothermal method. Adsorptive desulfurization ability of model oil and hydrotreated diesel was studied. The effects of template concentration, crystalization time and calcination time were investigated. The desulfurization ability of adsorbents was improved by transitional metal ion-exchanging. The adsorptive desulfurization of diesel was carried out on a fixed-bed system. The results show that the adsorptive capacity is MAS>MCM-41>NaY. The improvement of desulfurization ability of MAS by Cu⁺ is more significant than that of Ag⁺. Supported by National Basic Research Program of China (Grant No. 2006CB202507), National High-tech R&D Program (Grant No. 2006AA02Z209), and the National Natural Science Foundation of China (Grant No. 20806086)     

含硫弱酸性酚醛树脂对Ag+的吸附性能

含硫配位原子的螯合树脂对过渡金属离子尤其是贵金属离子具有良好的吸附性能[1]。螯合树脂的母体交联聚苯乙烯、聚甲基丙烯酸甲酯[2]具有疏水性,即使引入螯合基团其疏水性仍很强,对在水溶液中的吸附很不利。而含有酚醛骨架的螯合树脂具有亲水性[3]。本文以酚醛树脂为大分子骨架,通过化学反应连接上具有强配位原子硫的巯基羧酸,研究了该巯基弱酸性酚醛树脂对Ag+在各种条件下的吸附性能。1　实验部分1 1　仪器与试剂NicoletMAGNA550(SeriesⅡ)红外光谱仪,SHA C水浴恒温振荡器,3200原子吸收分光光度计,JSM 5600LV扫描电镜,Quest.le…     

D301R树脂对水溶液中硝基苯的吸附性质

研究了D301R弱碱性阴离子交换树脂对水中硝基苯的吸附作用,测定了不同温度下吸附的动力学曲线和吸附等温线,提出了吸附动力学模型,计算了平衡吸附量、吸附活化能和吸附焓等。 实验结果表明,吸附动力学符合表面过程控制的准二级反应模型,其速率常数k2在300 K时为3.74×10-2 g/(mg·min),并随温度的升高而升高;平衡吸附量在300 K时为5.02 mg/g,且随温度的升高而降低;吸附活化能为39.02 kJ/mol;吸附等温线符合Langmuir吸附模型,吸附焓为-22.47 kJ/mol,吸附作用力主要是氢键。     

Synthesis of mesoporous silica and its modification of bismaleimide/cyanate ester resin with improved thermal and dielectric properties

A novel method is proposed to synthesize new mesoporous silica containing amine groups (MPSA), and it was further employed to modify bismaleimide‐dialllyl bisphenol (BD)/cyanate ester (CE) resin to form novel MPSA/BD/CE hybrids; in addition, the typical properties of MPSA/BD/CE were systematically investigated. Results show that these hybrids have very low dielectric constant and loss as well as good thermal properties. Compared with BD/CE resin, all hybrids have not only decreased dielectric constant and loss but also similar dependence of dielectric properties on frequency over the whole frequency from 10 to 10⁶ Hz. Specifically, with the addition of MPSA to BD/CE resin, the dielectric constant reduces from 3.5 to 3.0, and the dielectric loss is only 85% of that of BD/CE resin. Note that all hybrids show better thermal resistance (reflected by higher glass transition temperature, decreased maximum degradation rate, and higher char yield at 800°C) than BD/CE resin. All these differences in macro‐properties are attributed to the different structure between MPSA/BD/CE hybrids and BD/CE resin. Copyright © 2011 John Wiley & Sons, Ltd.     

Fast removal of methylene blue (MB) with functionalized resin

Herein, a new adsorbent was developed in order to fast and effective removal of MB from aqueous solution. For this, crosslinked maleic anhydride polymer was synthesized by copolymerization of maleic anydride (MA) with divinyl benzene (DVB) in DMF at 75?°C using a radical initiator AIBN. A new functionalized resin containing carboxylic acid groups was prepared with modification of crosslinked maleic anydride resin with 5-aminoisophthalic acid. Prepared resin was characterized with FTIR, TGA/DTA and SEM. Parameters affecting adsorption such as pH, initial dye concentration and adsorption time, and also, different isotherm and kinetic models were studied. It was observed that synthesized resin could be used to MB fast removal wide pH and concentration range very high efficiency. It was also found to be that Freundlich isotherm model (R² = 0.9993) and second order kinetic models are much more suitable for adsorption of MB. Moreover, it was also observed that synthesized resin could be used at least five times without losing its original activity.     

大孔吸附树脂对金莲花黄色素的吸附性能研究

本文研究了大孔吸附树脂吸附金莲花黄色素的性能.研究结果表明:采用静态吸附法,从X-5、AB-8、D-296R、NKA、S-8 五种吸附树脂中筛选出一种吸附、解吸性能都较为理想的大孔吸附树脂X-5,并对其进行了静态吸附动力学的研究,得出的静态吸附动力学曲线反映了树脂的吸附量随时间的变化关系,其吸附动力学方程符合Langmiur提出的吸附速率方程.采用动态吸附法,得到动态吸附透过曲线和动态解吸曲线,其中采用80%乙醇溶液作为洗脱剂,其动态解吸率为88.79%.     

没食子酸修饰的超高交联吸附树脂对2,4-二氯苯氧乙酸的吸附性能研究

通过后交联反应和化学修饰反应制备了没食子酸修饰的超高交联吸附树脂(GAMR),以大孔吸附树脂XAD-4树脂为对照,研究了GAMR对水中2,4-二氯苯氧乙酸(2,4-D)的吸附性能.实验结果表明:GAMR具有较丰富的微孔,比表面积和微孔面积分别为1 232.3和899.5 m²·g^-1.GAMR对2,4-D的吸附动力学过程符合准一级动力学方程,吸附过程同时存在物理吸附和化学吸附.Freundlich等温方程能较好地拟合GAMR对2,4-D的吸附等温线.GAMR对2,4-D吸附过程的ΔG为负值,ΔH和ΔS均大于0,表明吸附是自发、吸热和熵增加的过程.与XAD-4相比,所制备的GAMR对2,4-D的吸附去除率显著提高.     

DH-2树脂对镝的吸附及机理

研究了镝离子在HD-2树脂上的吸附行为。在HAc-NaAc体系pH=6.20时吸附最佳,测得静态饱和吸附容量为356mg/g(树脂),用0.1~2.0 mol/L HC l可定量洗脱,表观速率常数k198=1.16×105s-1,表观活化能Ea=16.1kJ/mol。等温吸附服从Freun ilich经验式,吸附热力学参数△H=16.5kJ/mol,△S=58.2 J/(mol.K),△G298=-0.859kJ/mol。用化学和红外光谱等方法讨论了吸附机理。