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

doi:10.1016/S1872-2067(14)60275-8

催化学报 ›› 2015, Vol. 36 ›› Issue (4): 603-611.DOI: 10.1016/S1872-2067(14)60275-8

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

a Department of Advanced Materials Science & Engineering, Hanseo University, Seosan-si, Chungnam-do 356-706, Korea;
b Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Korea

收稿日期:2014-11-30 修回日期:2014-12-25 出版日期:2015-03-23 发布日期:2015-03-23
通讯作者: Won-Chun Oh

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

a Department of Advanced Materials Science & Engineering, Hanseo University, Seosan-si, Chungnam-do 356-706, Korea;
b Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Korea

Received:2014-11-30 Revised:2014-12-25 Online:2015-03-23 Published:2015-03-23

摘要/Abstract

摘要：

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.

关键词: Graphene, Silver selenide, Sonochemical method, Hydrothermal method, Rhodamine B, Texbrite BA-L

Abstract:

Key words: Graphene, Silver selenide, Sonochemical method, Hydrothermal method, Rhodamine B, Texbrite BA-L

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]. 催化学报, 2015, 36(4): 603-611.

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

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

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