Abstract
In this study, the experiment was divided into three parts. First, we tried to disperse the titania powders in order to enhance the photocatalytic activities via increasing the surface area. Compared with the dispersed titania powders only by ultrasonic vibration, the one added Triton X-100 performed better dispersing result and stability. Moreover, if we adjusted the pH value of suspension after adding Triton X-100, the surface charge of titania powders were enhanced and performed much better dispersing result. Then we tried to let the nano-silver particles adsorbed onto the surface of titania through chemical adsorption and chemical reduction two methods, and we found that the two ways did enhance the photocatalytic activity of titania by photocatalytic testing on methylene blue solution. The nano-silver particles could reduce the ability of recombination between electron-hole pairs in order to enhance the photocatalytic activity. We also used high-temperature hydrogen gas to reduce some Ti4+ to Ti3+ in the electronic configuration of titania. The photocatalytic activities of titania also improved due to the ability of capturing holes by Ti3+. Finally, we loaded nano-silver particles on titania which had been reduced by high-temperature hydrogen gas, and used them to proceed photocatalytic decomposition reaction on phenol in order to prove its photocatalytic ability. At last, we coated the titania powders having better photocatalytic activities on the glass substrate by three different kinds of adhesives. Then we found the silicone rubber could fix the titania powders on the glass substrate tightly and perform acceptable results by photocatalytic testing on methylene blue.