Citation: Lei Zhu, Shu Ye, Asghar Ali, Kefayat Ulla, Kwang Youn Cho, Won-Chun Oh. Modified hydrothermal synthesis and characterization of reduced graphene oxide-silver selenide nanocomposites with enhanced reactive oxygen species generation[J]. Chinese Journal of Catalysis, ;2015, 36(4): 603-611. doi: 10.1016/S1872-2067(14)60275-8 shu

Modified hydrothermal synthesis and characterization of reduced graphene oxide-silver selenide nanocomposites with enhanced reactive oxygen species generation

Lei Zhu ^a ,
Shu Ye ^a ,
Asghar Ali ^a ,
Kefayat Ulla ^a ,
Kwang Youn Cho ^b ,
Won-Chun Oh ^a,,

1.
a Department of Advanced Materials Science & Engineering, Hanseo University, Seosan-si, Chungnam-do 356-706, Korea;

Corresponding author: Won-Chun Oh,
Received Date: 30 November 2014
Available Online: 25 December 2014

A visible-light photocatalyst containing Ag₂Se and reduced graphene oxide (RGO) was synthesized by a facile sonochemical-assisted hydrothermal method. X-ray diffraction, scanning electron microscopy with energy-dispersive X-ray analysis, and ultraviolet-visible diffuse reflectance spectroscopy results indicated that the RGO-Ag₂Se nanocomposite contained small crystalline Ag₂Se nanoparticles dispersed over graphene nanosheets and absorbed visible light. The high crystallinity of the nanoparticles increased photocatalytic activity by facilitating charge transport. N₂ adsorption-desorption measurements revealed that the RGO-Ag₂Se nanocomposite contained numerous pores with an average diameter of 9 nm, which should allow reactant molecules to readily access the Ag₂Se nanoparticles. The RGO-Ag₂Se nanocomposite exhibited higher photocatalytic activity than bulk Ag₂Se nanoparticles to degrade organic pollutant rhodamine B and industrial dye Texbrite BA-L under visible-light irradiation (λ > 420 nm). The generation of reactive oxygen species in RGO-Ag₂Se was evaluated through its ability to oxidize 1,5-diphenylcarbazide to 1,5-diphenylcarbazone. The small size of the Ag₂Se nanoparticles in RGO-Ag₂Se was related to the use of ultrasonication during their formation, revealing that this approach is attractive to form porous RGO-Ag₂Se materials with high photocatalytic activity under visible light.
- Graphene,
- Silver selenide,
- Sonochemical method,
- Hydrothermal method,
- Rhodamine B,
- Texbrite BA-L
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