超高交联树脂吸附对硝基苯乙酮和对硝基苯甲酸的研究

研究了NDA-150、NDA-99、NDA-88、Amberlite XAD-4．4种吸附树脂对对硝基苯乙酮和对硝基苯甲酸的静态吸附行为。结果表明NDA—150树脂对硝基化合物的吸附效果较好。并研究NDA-150树脂的动态吸附和脱附行为．结果显示：NDA-150树脂对对硝基苯甲酸的吸附容量为2．32mmol／g干树脂，对对硝基苯乙酮的吸附容量为3．06mmol／g干树脂。NDA—150树脂易于脱附，吸附对硝基苯甲酸后．用2％NaOH：乙醇(体积比1：1)作脱附剂，温度313K；吸附对硝基苯乙酮后，用甲醇作脱附剂，温度333K，体积6BV，脱附率均接近100％。     

油相体系中大孔吸附树脂吸附性能的改进及表征

以对目标产物的吸附性能为主要指标,对XAD-7大孔吸附树脂进行改性修饰,增加大孔吸附树脂中羟基的比重,提高了大孔吸附树脂在油相体系中对目标产物的吸附能力.以HCl为催化剂,经40℃、24 h改性反应,改性树脂HZ-915的吸附能力为XAD-7树脂吸附能力的2.4倍.通过静态和动态吸附法对HZ-915改性树脂吸附模型的研究分析,证明在研究的浓度范围内,HZ-915树脂对极性物质的吸附符合Freundlich方程,HZ-915树脂对极性物质的吸附动力学符合Lagergren准二级速率方程.     

大孔吸附树脂纯化芹菜黄酮的研究

研究6种大孔吸附树脂对芹菜黄酮类物质的吸附和解吸性能,筛选出吸附率较高的XAD-16树脂,并对XAD-16树脂静态吸附和动态吸附解吸工艺做了研究。优化出XAD-16树脂纯化芹菜黄酮的最佳工艺参数为：室温下吸附;上样流速4 BV/h,在上样浓度0.55 mg/mL下,上样体积为15倍柱床体积;洗脱溶剂采用体积分数50%的乙醇,洗脱流速为6 BV/h,洗脱液量为4倍柱床体积。     

含氧超高交联树脂的合成及其对苯酚的吸附性能

以苯甲醇和氯甲醚为原料,采用一锅法合成了一种新型含氧超高交联吸附树脂OCHR,并用红外、元素分析和BET法对其化学结构、比表面积及孔径分布进行了分析。结果表明：OCHR树脂比表面积可达525 m²/g,氧含量为6.50%。在相同条件下用XAD-4吸附树脂作对照,比较了它们对水溶液中苯酚的静态吸附能力,除此以外,对树脂OCHR对苯酚的吸附动力学也进行了研究。结果表明,在比表面积远小于XAD-4的情况下,OCHR对水溶液中苯酚的吸附量是XAD-4的2.22倍。树脂OCHR的优良吸附效果归因于树脂上含有的大量氧。     

大孔吸附树脂XAD-4对聚乙二醇的吸附性能

以大孔吸附树脂XAD-4为吸附剂,采用静态平衡吸附法吸附模拟聚乙二醇(PEG)废水,考察了初始pH值、吸附时间、吸附剂投加量和温度等因素对PEG去除效果的影响. 结果表明,pH值对吸附过程的影响可忽略不计. 当XAD-4树脂投加量为0.3 g/L时,PEG去除率可达89%,平衡吸附量Qe=59.95 mg/g. PEG在XAD-4树脂表面上均一分布,Langmuir, Dubinin-Radushkevich和Sips模型可较好地模拟其等温吸附过程. 不同温度下均为自发的放热吸附过程. 动态吸附数据符合拟二级动力学方程.     

超高交联树脂对水溶液中山梨酸的吸附研究

研究了NDA-150超高交联吸附树脂对水溶液中山梨酸的静态吸附行为,探讨了pH值、温度、盐度以及乙醇的含量等因素对山梨酸在NDA-150树脂上吸附的影响。实验结果表明,该树脂对山梨酸的吸附能力明显优于CHA-111和XAD-4树脂,树脂的表面极性和微孔结构在吸附过程中起决定作用。吸附的最佳pH值为3,降低温度有利于吸附,NaCl的存在有利于吸附,乙醇的质量分数大于1%时,吸附量会显著降低。     

N-甲基乙酰胺基修饰的超高交联吸附树脂的合成与吸附性能

以大孔交联氯甲基化聚苯乙烯为原料通过Friedel-Crafts反应、甲胺化反应和乙酰化反应,制备了N-甲基乙酰胺基修饰的超高交联型吸附树脂。研究了树脂对水溶液中水杨酸的吸附去除性能。结果表明,所制得的树脂能有效吸附水溶液中的水杨酸,吸附等温线都是I型吸附等温线,Langmuir和Freundlich方程模型都可很好地拟合平衡吸附数据。水杨酸原始浓度在903.6 mg/L、流速在88 mL/h,10 mL湿树脂在60 BV(1BV=10 mL)左右出现穿透,性能优于目前商品化的XAD-4树脂和XAD-7树脂。     

ZH-01吸附树脂对苯甲酸的吸附性能研究

比较了超高交联吸附树脂ZH-01与大孔吸附树脂AmberliteXAD-4对苯甲酸的静态吸附和动态吸附行为,并探讨了温度和起始浓度对平衡时间和吸附速率的影响.从静态平衡吸附行为及其热力学性质讨论吸附机理,动态吸附进一步验证聚苯乙烯超高交联吸附树脂对苯甲酸的吸附能力比AmberliteXAD-4强.结果表明:在288～3...     

2,4-二羟基苯甲酸在3种树脂上的吸附特性

通过静态和动态吸附实验, 研究了717(凝胶型,强碱)、D201(大孔型,强碱)和D301R(大孔型,弱碱)3种阴离子交换树脂对水溶液中2,4-二羟基苯甲酸的吸附特性. 结果表明,717和D201在pH 4~11时、D301R在pH 3~9时吸附能力最好. 在pH=5及温度293~313 K、初始浓度0.6488~6.488 mmol/L条件下,D301R, 717和D201对2,4-二羟基苯甲酸的等温吸附规律均符合Freundlich模型,最大平衡吸附量分别为2.98, 2.66和2.54 mmol/g(吸附未达饱和),均为物理性自发吸附的放热过程. 动力学实验数据用准一级模型方程拟合比准二级更接近实验值. 5%(w) NaCl+2%(w) NaOH脱附液100 mL均可有效洗脱3种树脂上吸附的2,4-二羟基苯甲酸,脱附率达99%. 相同条件下,D301R树脂对2,4-二羟基苯甲酸的吸附性能优于D201和717树脂.     

2－萘酚在新型聚苯乙烯－二乙烯苯吸附树脂上的吸附

合成了用邻羧基苯甲酰基修饰的新型聚苯乙烯一二乙烯苯吸附树脂ZH—03和ZH-05．利用瓶点法研究了它们和Amberlite XAD-4树脂对288—318K下水溶液中2-萘酚的静态吸附和静态脱附特征。结果表明,ZH-03和ZH-05对水溶液中2-萘酚的吸附过程在合适温度时会使酚羟基和吸附剂表面的羧基发生作用,穿透吸附容量和饱和吸附容量显著提高,吸附等温线符合Freundlich方程：ZH-03和ZH-05对2-萘酚的穿透吸附容量为XAD-4的120％～133．3％．饱和吸附容量分别达到0．0868和0．105g／mL：用1mol/L的NaOH溶液再生时,比用甲醇作脱附剂具有明显优势。     

Adsorption of 1,3-propanediol from synthetic mixture using polymeric resin as adsorbents

The aim of this work was to separate 1,3-PDO from a synthetic mixture using polymeric resins, Amberlite XAD-7 and XAD-16 resins. The equilibrium adsorption of 1,3-PDO onto two polymeric resins were investigated in binary and tertiary systems. Experimental results of binary component adsorption equilibrium indicated that the adsorption capacity (q) of 1,3-PDO at 160 g/L onto XAD-7 and XAD-16 was 835.96 and 584.61 mg 1,3- PDO/g dry resin, respectively. The adsorption isotherms were closely predicted by the Langmuir-Freundlich model among the two isotherm model tested. The value of n of 1,3-PDO adsorbed on XAD-7 are much higher than those on XAD-16. This result suggested that XAD-7 resin has a higher affinity for the 1,3-PDO adsorption than XAD-16 resin. Moreover, the value of adsorption capacity of 1,3-PDO in the binary and tertiary component were compared at the same conditions. In the tertiary system, although the selectivity of 1,3-PDO from XAD-7 was approximately six times higher than XAD-16, the adsorption capacity of 1,3-PDO at 160 g/L onto XAD-16 was higher than XAD-7. Interestingly, the reusability of XAD-7 and XAD-16 resins in the three cycle times shows a slight loss of adsorption capacity. Furthermore, the investigation about desorption by an ethanol/water mixture at 50% (V/V) indicated that the desorption yield of 1,3-PDO from XAD-7 was lower than XAD-16 resin for both the binary and tertiary component. This was due to the more favorable adsorption characteristics of XAD-7 resin than XAD-16 resin.     

Enrichment and Purification of Total Chlorogenic Acids from Tobacco Waste Extract with Macroporous Resins

In the present study, an evaluation was conducted on the performance and separation characteristics of nine macroporous resins for the enrichment and purification of total chlorogenic acids from tobacco (Nicotiana tobaccum L.) waste extracts. Based on the results, XAD-4 offered higher adsorption and desorption capacities for total chlorogenic acids than other resins. To optimize the separation process of total chlorogenic acids, a column packed with XAD-4 resin was used to perform dynamic adsorption and desorption tests. The results show that the highest purity of the total chlorogenic acids product was 89.27% when optimum parameters for the adsorption process packed with the XAD-4 resin were as follows: flow rate 3.6 BV/h, pH 3.0; for desorption: ethanol–water (40:60, v/v) used as eluent, flow rate 3.6 BV/h, respectively. Therefore, the XAD-4 resin revealed a good ability to enrich and purify total chlorogenic acids. The method developed will provide a potential approach for the large-scale separation and purification of chlorogenic acid in pharmaceutical applications as a medical intermediate or a material for traditional Chinese medicine.     

2，4-二氯苯酚在超高交联树脂上的吸附性能的研究

比较了超高交联聚苯乙烯吸附树脂与大孔吸附树脂Amberlite对2,4-二氯苯酚的静态和动态吸附行为。结果表明：在288-318K和研究的浓度范围陡,JP-1和XAD-4对2,4--二氯苯酚的吸附平衡数据符合Freundlieh吸附等温方程。吸附为吸热过程,适当降低温度有利于吸附,并计算了2,4-二氯苯酚在JP-1、XAD．4树脂上的吸附焓变、自由能变、吸附熵变,对吸附行为进行了合理豹解释。     

乙酰苯胺修饰的吸附树脂对2,4-二氯苯酚的吸附研究

通过后交联反应,用乙酰苯胺修饰氯甲基化的低交联大孔聚苯乙烯-二乙烯(氯球),合成了一种超高交联吸附树脂ZH-05。用活性炭GAC和Amberlite XAD-4树脂作为参照,测试了ZH-05吸附树脂对2,4-二氯苯酚的吸附性能。讨论了静态平衡吸附行为和化学吸附特征的证实。结果表明:吸附等温线都能用Langmu ir方程很好的拟合,且2,4-二氯苯酚在ZH-05吸附树脂上的吸附是一个吸热过程,吸附量随吸附温度的升高而增加,和活性炭一样,ZH-05树脂对水溶液中2,4-二氯苯酚的吸附过程中同时存在着物理吸附和化学吸附。     

间硝基酚在复合功能树脂上的吸附热力学及动力学研究

选用NDA-88、NDA-99、NDA-150、XAD-4几种吸附树脂对间硝基酚的静态吸附行为进行了研究,结果表明:间硝基酚在NDA-88、NDA-99复合功能树脂上的吸附效果较好。研究了NDA-88树脂对水溶液中间硝基酚的静态吸附等温线,并计算了吸附热力学函数,吸附行为符合Freundlich吸附等温方程,吸附量随温度升高而降低,表明为物理吸附。动力学研究结果表明:吸附速率随温度升高而增大。