| 초록 |
Photocatalysts consisting of a complex of size-controllable porous TiO2 and zinc phthalocyanine (ZnPc) were successfully prepared by using triblock copolymers with various ethylene oxide chain lengths. The TiO2/ZnPc hybrid composite materials are porous and spherical with high surface areas and porous frameworks, which are important considerations in the design of photocatalysts because such structures promote the decomposition of organic pollutants and scatter incident light under visible light illumination. These materials were characterized by using Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, field-emission scanning electron microscopy, dynamic light scattering, diffused reflectance spectroscopy and other techniques. These results confirmed the formation of spherical TiO2/ZnPc hybrid clusters of various sizes (250, 550, 800, 1100 nm in diameter), large internal surface areas (up to 223.76 m2/g), and wormhole-like mesoporous structures. These ZnPc-embedded mesoporous TiO2 clusters can function as light scatterers without sacrificing surface area, so they exhibit excellent photocatalytic efficiency (up to 80.2%) in the degradation of organic contaminants in aqueous media under visible light irradiation. The relationship between the physicochemical properties and the photocatalytic activities of these materials is described and discussed on the basis of our results. |
