CuTSPc／TiO2纳米杂化材料的超临界制备及太阳光光催化

Supercritical process and solar photocatalytical performance of CuTSPc/TiO2 hybrid Nanomaterial

采用超临界处理方法，制备纳米四磺化酞菁铜（Copper（Ⅱ）Tetrasulfophthalocyanine，缩写CuTSPc）／TiO2杂化材料，采用XRD、UV-vis、IR对光催化剂进行了表征，以光稳定性较强的甲基橙水溶液为降解目标物，研究了CuTSPc敏化的TiO2光催化剂在太阳光光照射下的光催化活性。在合成的过程中，通过Sol-gel工艺使水溶性CuTSPc均匀分散在TiO2的基质中，经超临界处理后，在TiO2晶粒表面形成与CuTSPc键合，当可见光激发后，从CuTSPc光激发产生的光生电荷向TiO2转移，同时，通过能量转移，提高TiO2自身的光催化效率，以实现CuTSPc与TiO2协同可见光光催化，其中，掺杂比例0．17％（摩尔分数）的CuTSPc／TiO2太阳光降解率最高（0．0653min^-1）。

Nanoscale hybrid material （CuTSPc/TiO2） was prepared by using supercritical method and was characterized by XRD, UV-vis diffuse reflection and IR. The photocatalytical activity of the TiO2 sensitized by CuTSPc irradiated under solar light was studied by using methyl orange as the photodegradation object. The chemical bond-linkage between TiO2 and CuTSPc is obtained by supercritical process. The transfer of electron between them can be promoted so that the recombination probability of photo-induced electrons and holes diminish, and the quantum efficiency increases. At the same time, the high absorption property of CuTSPc at visible region （Q band） and cooperation between CuTSPc and TiO2 can be used to improve the photocatalytical activity of TiO2. For the more, the state of CuTSPc aggregates and its coverage can influence the photocatalytical performance of the photocatalysts.