四(4-磺酸苯基)-卟啉(TPPS)是一种水溶性卟啉,在一定条件下可以自组装形成超分子聚集体,将这种超分子聚集体与膜材料相结合,可以形成超分子负载膜.文中以乙烯-乙烯醇共聚物(EVAL)为膜材料,4-乙烯基吡啶(4VP)为单体,采用紫外辐照表面接枝法制备了表面带有P4VP接枝链的EVAL-P4VP接枝膜,利用非共价键作用将TPPS负载于EVAL原膜及EVAL-P4VP接枝膜上,研究了pH值、离子强度、接枝率等因素对TPPS吸附过程以及TPPS在膜表面存在形态和自组装行为的影响.结果表明,TPPS溶液中自身聚集及离子强度的增加对其在膜上的吸附产生不利影响;吸附过程可用Langmuir等温吸附模型进行描述;接枝率的增加、pH值的减小和吸附量的增加有利于TPPS在接枝膜表面形成J-聚集体.
Water-soluble tetrakis-(4-sulfonatophenyl)-porphyrin (TPPS) can self assemble into suprarnolecular aggregates under certain condition.Supramolecular structure-loaded membrane can be obtained by combination of supramolecular aggregates and membranes.In this paper,poly (4-vinylpyridine)-grafted ethylene-vinyl alcohol (EVAL-P4VP) membrane was prepared by UV grafting polymerization of 4VP onto EVAL membrane.The adsorption behavior and self-aggregation of TPPS on membrane were discussed.The effect of pH,ionic strength and grafting degree on the adsorption behavior and self-aggregation of TPPS was studied.The results show that selfaggregation of TPPS and increased ionic strength lead to a decreased adsorption capacity of TPPS on membranes.The adsorption process of TPPS on membrane can be described by Langumir isotherm model.Decreasing pH,increasing adsorption capacity and grafting degree were in favor of J-aggregation of TPPS on the membrane surface.
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