TPPS在EVAL膜表面的吸附及超分子自组装
作者:张玉新12,赵莉芝12,张玉忠12,叶卉12,刘满满12,李泓12
单位: 1. 天津工业大学材料科学与工程学院,天津,300387;
关键词: TPPS;DMAEMA;EVAL
DOI号:
分类号:
出版年,卷(期):页码: 2015,35(1):1-8

摘要:
TPPS(四-(4- 磺酸基苯基)卟啉)在一定条件下可以自组装形成超分子聚集体。将TPPS超分子聚集体与膜材料结合,可制备一种超分子负载膜。本实验以EVAL(乙烯-乙烯醇共聚物)为基膜,以DMAEMA(甲基丙烯酸N,N-二甲氨基乙酯)为单体,采用紫外接枝的方法制备了EVAL-g-PDMAEMA接枝膜,利用氢键、静电作用等非共价键作用将TPPS负载于EVAL原膜及EVAL-g-PDMAEMA接枝膜上。研究了pH值、离子强度、接枝率对吸附过程的影响及等温吸附机理。结果表明,当pH=3.6时接枝膜对TPPS的吸附容量最大,pH=7时,原膜对TPPS的吸附容量最大;离子强度的增大不利于膜对TPPS的吸附;EVAL-g-PDMAEMA接枝率的增大,接枝膜对TPPS的吸附容量也随之增大;Langmuir吸附等温方程可以对吸附过程进行很好的描述。改变EVAL /TPPS负载膜的pH条件,利用紫外漫反射光谱表征膜表面TPPS的聚集状态,考察不同DMAEMA接枝率的负载膜实现超分子结构的条件。实验结果显示,当pH<1时,TPPS在接枝膜和原膜表面均形成超分子J-聚集体,而pH>1时,TPPS仅在接枝膜表面形成H-聚集;并且DMAEMA的接枝率越高,越有利于TPPS聚集体的形成,进而有利于超分子负载膜的构筑。
TPPS can spontaneously assemble into supramolecular aggregates under certain conditions. A supramolecular membrane was prepared based on TPPS supramolecular aggregates and membrane materials. In this paper, EVAL-g-PDMAEMA membrane was prepared by ultraviolet radiation grafting with EVAL as the raw membrane and DMAEMA as the monomer. The TPPS was loaded on EVAL and EVAL-g-PDMAEMA membrane via non-covalent as hydrogen bonds, electrostatic interactions, etc. The effects of pH, ionic strength and grafting degree on the adsorption process and isothermal adsorption mechanism of TPPS was studied. The results showed that, the maximum absorption of TPPS on the grafted membrane appeared at pH=3.6, while on the raw membrane at pH=7. The increase of ionic strength caused an adverse impact on the adsorption of TPPS on the membrane surface. While the adsorption amount of TPPS increased with the increase of EVAL-g-PDMAEMA grafting degree. The adsorption process can be well described by Langmuir isotherm model. The aggregation state of TPPS and the conditions of constructing a supramolecular structure was studied by changing the pH of the EVAL-g-PDMAEMA/TPPS membrane with aid of UV reflectance spectroscopic. The results show that, at pH<1, TPPS formed supramolecular J-aggregates on the EVAL and EVAL-g-PDMAEMA membrane surface, while at pH>1, only formed H-aggregates on EVAL-g-PDMAEMA membrane surface. Besides, higher grafting degree of DMAEMA contributed to the formation of TPPS aggregates, further to the building of supramolecular membrane.
 

基金项目:
国家自然科学基金项目(51173132,21204064,50973083,51373120),天津市应用基础及前沿技术研究计划重点项目(11JCZDJC21200),高等学校博士学科点专项科研基金(20111201110003),中空纤维膜材料与膜过程省部共建国家重点实验室培育基地开放课题。

作者简介:
张玉新(1986—),男,山东德州人,硕士研究生

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