Photocatalytic Degradation of Polyacrylamide in Oilfield Sewage by Nano-sized TiO2 Doped with W Ion

Abstract

The Nano-TiO2 was modified by doping TiO2 nanoparticles with W6+ as catalyst, improving the photocatalytic activity and photocatalytic properties of nanometer TiO2. We have studied the tungsten doped TiO2 nanoparticles’ photocatalytic degradation performance and viscosity reduction properties to the polymer by the degradation of polyacrylamide in oilfield sewage (PAM). Different catalysts, different amount of catalyst and PAM aqueous solution’s pH value effect the photocatalytic degradation rate. The results show that: tungsten doped nanometer TiO2 has higher photocatalytic activity than the TiO2 nanoparticles and its photocatalytic performance of viscosity reduction is very significant. The oil-field sewage degradation rate reached about 70% after 120min light reaction of 125 W high pressure mercury lamp as the light source with 3%tungsten doping amount and 1% photocatalyst dosage. TiO2 nano-particles doped with tungsten had obvious viscosity reduction effect on the photolytic oxidation of oilfield wastewater containing PAM.