Microwave Assisted Preparation of Nd-Doped Nano-TiO2 Photo-Catalysts in Ionic Liquids and Its Microwave Enhanced Photo-Catalytic Activity *

Using Ti(OBu)4 as the precursor, Nd-doped nano-TiO2 photo-catalysts were prepared by the sol-gel method in ionic liquids. The IR and XRD were used to characterize the structure of the catalysts. At a constant temperature (25 ℃), using the three conditions of MW, UV, MW/UV respectively, the effects of the calcinations temperature, the calci- nations time, the power of microwave drying, microwave drying time, the amount of ionic liquid and the Nd doping amount on the photo-catalytic activity of TiO2-Nd for degradation of methyl orange were investigated in the combina- tion of catalytic synthesis of microwave ultrasonic instrument. The tests indicated that the catalytic activity of TiO2-Nd reached the highest level under the following conditions: calcination temperature (650℃), calcination time (2 h), mi- crowave drying power (210 W), microwave drying time (20 min), ionic liquid volume (5.6 mL) and Nd doping amount (n(Nd)/n(Ti) = 0.005). The degradation rate of methyl orange under three conditions were 11.58%, 80.67%, 86.59%, and degradation effect of methyl orange under three conditions: MW/UV > UV > MW. The results showed that MW had a very good synergy with UV and microwave had the effect of strengthening TiO2-Nd degradation of methyl orange.