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Adsorption of TPPS and supramolecular self-assembly on EVAL membrane surface
Authors： Zhang Yuxin, Zhao Lizhi, Zhang Yuzhong, Ye Hui, Liu Manman, Li Hong
Units： 1. School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin, 300387, China; 2. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin, 300387, China.
KeyWords： TPPS; DMAEMA ; EVAL
ClassificationCode：
year,volume(issue):pagination： 2015, 35(1):1-8

Abstract：

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.
 

Funds：
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。

AuthorIntro：
张玉新（1986—），男，山东德州人，硕士研究生

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