A NIR-driven photocatalyst based on alpha-NaYF4:Yb,Tm@TiO2 core-shell structure supported on reduced graphene oxide
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AbstractThe development of near-infrared (NIR) light-driven photocatalysts is needed to utilize the large portion of NIR energy in sunlight. In this work, a new strategy to fabricate advanced upconversion-based NIR-driven photocatalysts was developed by integrating core-shell nanostructure of alpha-NaYF4:Yb,Tm@TiO2 with reduced graphene oxide (RGO) nanosheets. This new alpha-NaYF4:Yb,Tm@TiO2/RGO composite was synthesized by a facile wet chemical method. The product exhibited significantly enhanced photocatalytic activity than bare alpha-NaYF4:Yb,Tm@TiO2 and alpha-NaYF4:Yb,Tm/TiO2/RGO physical mixture for the degradation of various organic pollutants, including methylene blue (MB), methyl orange (MO) and phenol, under NIR (980 nm laser) irradiation. Highly reactive hydroxyl radicals ((OH)-O-center dot) were found to be the major reactive species. It was revealed that the core-shell structure of alpha-NaYF4:Yb,Tm@TiO2 improved the upconverison UV energy transfer, while the incorporation of RGO facilitated the photo-generated e(-)-h(+) separation after excited by the upconversion energy. Our discovery highlights the potential of developing NIR-driven photocatalysts by taking advantage of the synergic effects of core-shell upconversion materials combined with graphene for environmental and energy-related applications.
All Author(s) ListWang WJ, Li YC, Kang ZW, Wang F, Yu JC
Journal nameApplied Catalysis B: Environmental
Volume Number182
Pages184 - 192
LanguagesEnglish-United Kingdom
KeywordsPhotocatalysis, Near-infrared-light, NaYF4, TiO2, Graphene, Organic pollutants degradation
Web of Science Subject CategoriesChemistry, Physical;Engineering, Environmental;Engineering, Chemical;Chemistry;Engineering

Last updated on 2020-14-08 at 00:57