Hollow materials have many kinds of advantages, such as larger specific surface area, short diffusion distance of reactant molecules to active sites on the shell and favorable dispersion in liquid media. In this point of view, hollow structured materials can be a good candidate as an effective solid catalyst for water treatment. TiO2 is one of the well-known photocatalysts, for its non-toxic, high stability toward photo- and chemical corrosion and abundant amount on the earth. It is well known that two representative crystalline phases of TiO2, which are phototactically active, are anatase and rutile ones. Anatase phase has good electron lifetime resulting in superior performance under UV light irradiation. But limited use of UV in solar spectrum are hampering practical use of TiO2. In order to overcome the limitation, photocatalysis should have narrow band gap energy resulting increasing utilization of solar spectrum. In this work, we synthesize CuO-rutile TiO2 hybrid hollow nanoparticles via template assisted sol-gel method. Both CuO and rutile TiO2 which have narrower band gap energy (2.58 eV, and 3.0 eV) than anatase one (3.2 eV) should absorb visible light and show superior activity. The synthesized CuO-rutile TiO2 hybrid hollow nanoparticles characterized by SEM, TEM, XRD and BET. When used as photocatalysts in phenol (10 ppm) photodegradation, hollow CuO-TiO2 hybrid samples showed improved photocatalytic activities compared to hollow anatase TiO2 counterpart under visible light irradiation conditions. In this presentation, we will discuss details of the synthesis and characteristics of hollow CuO-TiO2 hybrid and photocatalytic activity on phenol photodegradation.

Synthesis of hollow structured CuO-rutile phase TiO2 hybrid nanoparticles and applications for water purification under visible light condition

2019 Fall National Meeting

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