Preliminary Study On The Design And Performances Of Photocatalytic Reactor

With rapid development of industry and improvement of people’s living standard inChina, more families are beginning to pay close attention to the quality and safetyof drinking water. These strong demands push forward the quick development of drinkingwater treatment technique. As a major one, photocatalytic oxidation technology hasattracted much attention for new technique, non-selective degradation oforganic pollutants, and no secondary pollution, etc. It’s enough reasonable to introducethis technique to equipment of drinking water treatment for family user.In this research, we focused on TiO₂-mediated photocatalytic oxidation technique tomake Ti sol and then load on activated carbon powder. Through the degradation process ofmethylene blue solution we got the best immobilization conditions. Through static anddynamic degradation experiments, we tested the degradability of TiO₂photocatalyticreactor model. Based on these, we made a photocatalytic reactor for purifying drinkingwater. The major works are below.（1）The selection of TiO₂photocatalytic carrier. Three different microscopic nature ofthe activated carbon was verified by iodine and methylene blue adsorption method.Cocoanut active charcoal was a suitable carrier.（2）The confirmation of conditions about TiO₂gel’s immobilization and validation ofthe degradability. Different catalysis are made under different conditions, thedegradability of methylene blue was used to determine the best immersing time,immobilized catalyst temperature, mass ratio and the number of immobilization were15min deal with supersonic wave,500℃,1:1.5and1times. Static experiments show thatthe prepared TiO₂gel has a good degradability against dimethyl phthalate, diethylphthalate, BBP. （3）The built and validation of TiO₂photocatalytic reactor. By continuous operation ofphotocatalytic reactor, we obtained that activated carbon with TiO₂was6.5times theservice life of activated carbon and dynamic experiments show that the reactor can processthe different concentration of different pollutants; the water quality canbe better controlled. The data from HPLC, GCMS indicated that the reactor was efficientin degrading normal pollutants in drinking water. All these give a promise for practicalapplication of TiO₂photocatalytic reactor.（4） At last, we build a photocatalytic reactor model and discuss the possibility ofpractical application.