Preparation Of Nano TiO₂/WO₃Photocatalyst Using PCL-b-PAA As Template

Nano titanium dioxide (TiO2) because of its high photocatalytic activity, good stability, non-toxic, no secondary pollution and other characteristics, has attracted much attention. The establishment and optimization of new preparation methods and doping modification are very important for the research and development of high-performance nano-TiO2photocatalyst. In this article, a kind of block copolymer was used as template via sol-gel method to prepare the WO3doping nano-TiO2photocatalyst, then its activities in photocatalytic degradation were studied.First, ring opening polymerization (ROP) and atom transfer radical polymerization (ATRP) were combined to prepare well-defined amphiphilic poly(ε-caprolactone-b-polyacrylic acid (PCL-b-PAA) block copolymers, through changing the ratio of the initiator to get different length of the blocks. Then, we investigate the amphiphilic block polymers PCL-b-PAA by static breath figure method in different conditions.Then, the amphiphilic PCL-b-PAA block copolymer was employed as template to prepare the TiO2/WO3nano-photocatalyst by sol-gel method. The studies on the morphology, crystal structure and property of nano-TiO2/WO3photocatalyst were performed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometer (XRD) and thermal grativity analysis (TGA). Furthermore the photocatalytic activity of nano TiO2/WO3with different ratio of doped WO3in the photodegradation of methylene blue (MB) was investigated by ultraviolet visible spectrometry (UV-vis).