PANI-TiO₂复合方法的探索及光电性能研究

【作者】 于佳；

【导师】 付宏刚； 秦川丽；

【作者基本信息】 黑龙江大学 ， 高分子化学与物理， 2007， 硕士

【摘要】 本文分别以电化学和化学氧化聚合的方法,合成聚苯胺及聚苯胺/纳米二氧化钛的复合材料,利用UV-VIS、Raman、FT-IR、TGA、XRD等测试手段对复合材料进行表征,并以罗丹明B为目标降解物,评价复合材料的光催化活性,同时对其催化机制进行分析。讨论了用循环伏安方法合成PANI膜和PANI/TiO2复合膜的过程中,扫描上限、苯胺单体浓度、电解液的种类和浓度对聚合反应的影响。实验结果表明:苯胺单体浓度存在极值点,即当浓度为0.5mol/L时聚合反应中氧化-还原电流最大;在浓度为1.0mol/L的HClO4介质中制得的薄膜的成膜性及牢固性更好;聚合反应的引发需要在较高的电位下进行,一旦形成聚合膜,则可在较低电位进行。而在TiO2膜电极上引入构造PANI与TiO2之间电子传递通道的分子锚后,起到了降低反应引发电位和加快反应速度的作用,分子锚的吸附浓度在0.3mmol/L时的效果最好。复合膜的光催化活性与PANI的分子结构有关,通过交替电位的控制,可以提高复合膜的光催化活性。采用溶液原位聚合法、湿法聚合法制备了以TiO2为核不同酸掺杂PANI为壳的复合粒子;利用水热法合成了以不同酸掺杂PANI为核TiO2为壳的复合粒子。实验结果表明,复合粒子间不是简单的混和,在两种物质之间存在着相互作用。以HCl掺杂PANI为核,以TiO2纳米粒子为壳的复合粒子吸光范围较TiO2有所扩宽,有利于电荷载流子的迁移,光催化活性有所提高。更多还原

【Abstract】 In this paper, PANI and PANI/nano-TiO2 composites were prepared by electrochemical and chemical polymerization. The composites were characterized by UV-VIS, Raman, FT-IR, TGA, XRD as well as the activity of photocatalytic of the composites were evaluated. The photocatalytic properties and mechanism were discussed.The PANI and PANI/TiO2 films were prepared by cyclic voltammetry, the results indicated that the properties of the films were influenced by the highest potential, the concentration of aniline and electrolyte. The introduction of the molecular anchor onto the TiO2 films could depress the highest potential and increase the rate of reaction. The photocatalytic properties of PANI/TiO2 films were related with the structure of PANI, and the catalytic activity could be enhanced by employed alternant potential.The PANI/TiO2 particles of core-shell structure in which the core was nano TiO2 were prepared by in-situ and“wet method”polymerization. The complex particles of core-shell structure in which the core was doped PANI were prepared by hydrothermal method. It could be proved that there were interaction between PANI and TiO2 and they were not blended simply. The complex particles with HCl-doped PANI as the core could inhibit the recombination of photoinduced electrons and holes, expand their photo absorb for visible light, and increase the catalytic activities.更多还原