Degradation of Trace Oil by Nano-TiO<sub>2</sub> Loaded on Hollow Float Beads

Abstract

The nano-TiO2 photocatalysts which loaded on hollow float beads were prepared by sol-gel process. The hollow float beads as carrier was modified by H2SO4 and the TiO2 sol was obtained by tetrabutyl titanate, the modified hollow float beads was added into TiO2 sol, the TiO2 gel was obtained, then calcined at 450°C, 500°C, 550°C respectively and obtained as-produced samples. Their property were characterized by TGA, XRD and SEM, Their photoactivity was evaluated by the photodegradation of the trace oil from fossil-fired power plant condensate under a series of temperature（15°C~45°C）, pH value（2~14）, initial oil concentration（5mg/L） and catalysts dosage（2.500g/L, 4.000g/L, 5.000g/L, 6.000 g/L, 7.500g/L, 10.000g/L）, the experimental results showed that as temperature at 35°C, pH value at 10, catalysts dosage at 5.000g/L and calcined temperature at 500°C, the trace oil degradation rate could exceed 90% in 12 h, the catalysts could provided a efficient method to degradate the trace oil.