Funct. Mater. 2020; 27 4: 811-819.

doi:https://doi.org/10.15407/fm27.04.811

Investigation of microstructure and photocatalytic activity of quartz sand composite supported by hierarchical porous TiO₂

Wei He, Gang Liao

Department of Traffic and Municipal Engineering, Sichuan College of Architectural Technology, 610399 Chengdu, China

Abstract:

In this paper, the synthesis of quartz sand coated with a hierarchical porous TiO₂ composite is reported. The synthesis was realized by the hydrolysis of tetrabutyl orthotitanate on natural quartz sand and followed by hydrothermal treatment. The phase composition of the as-prepared composites was studied by interpretation of X-ray diffraction patterns. The morphology of the composites was analyzed using a scanning electron microscope. The pore-size distribution and specific surface area of the composites were characterized by the N₂ adsorption-desorption test. The photocatalytic activity of the composites was evaluated by the photocatalytic decomposition of gaseous HCHO under UV irradiation. The results show that the hierarchical macro-/mesopore structure plays a key role in enhancing the photocatalytic activity of the composite, which can reach 79.2 % h^-1. After 5 repeated tests, the composites still retained high photocatalytic activity.

Keywords:

quartz sand, ierarchically porous structure, photocatalytic activity.

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