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A La-doped TiO 2 (La/TiO 2 ) photocatalyst with optimum La/Ti molar ratio of 1.25% is prepared by ultrasound-assisted sol–gel method, followed by supercritical drying in ethanol fluid. During liquid phase photocatalytic degradation of phenol, the as-prepared La/TiO 2 exhibits higher activity than the La/TiO 2 obtained without ultrasonication. Meanwhile, the La/TiO ...
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