金属酸化物粉末と超音波のハイブリッド水処理技術

抄録

Effects of TiO₂ powder addition on sonochemical destruction of 1,4-dioxane in water were investigated through comparison of SiO₂ powders with similar specific surface area. Addition of TiO₂ is more effective for decomposition of 1,4-dioxane in water than is SiO₂. Contribution of photocatalytic destruction through sonoluminescence is not dominant to the effectiveness of TiO₂ for acceleration of sonochemical reactions. Temperature changes of water or suspension during sonolysis suggest that an endothermic process exists in the TiO₂-added water. Regarding sonication of TiO₂-added water in the present study, thermally excited holes will be generated. Intrinsic oxygen vacancy in TiO₂ surface also plays an important role for high decomposition efficiency by producing cavitations. Both ultrasonication energy consumed in water and destruction efficiency of 1,4-dioxane were increased by the addition of reduced TiO₂ powder.