Journal
CHEMISTRYSELECT
Volume 8, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.202300997
Keywords
SiO2; graphene; TiO2; visible light; photodegradation
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This paper presents a novel approach to prepare TiO2/graphene nanocomposites with improved photocatalytic performance by using porous SiO2/graphene spheres as supports. The catalyst showed a higher degradation rate of the dye RhB compared to commercial P25 catalyst.
The use of TiO2/graphene composites as catalysts for photodegradation of dyes has been widely investigated. TiO2/graphene composites are usually obtained by coating TiO2 on the surface of pre-prepared graphene. However, graphene is prone to curling and stacking, which makes it difficult to uniformly coat TiO2 on its surface, resulting in poor photocatalytic performance. In this paper, a non-conventional approach to prepare TiO2/graphene nanocomposites based on the use of porous SiO2/graphene spheres as supports is presented. SiO2/graphene spheres with intercalated structure and dendritic pores were prepared as supports by a one-step hydrothermal method. Then, TiO2 was coated into the pores of SiO2/graphene spheres by sol-gel method to obtain SiO2/graphene@TiO2 composites (SGT). After 90 min of visible light irradiation, the degradation rate of RhB by SGT catalyst was 68.9 %, which was significantly higher than that of P25 by 39.3 %. A mechanism of the RhB removal by the SGT composites was proposed.
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