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Open AccessArticle

The Roles of Graphene and Ag in the Hybrid [email protected]2O-Graphene for Sulfamethoxazole Degradation

1,2, 1,2,* and 3,*
1
Institute of Eco-environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
2
Shanghai Engineering Research Centre of Low-Carbon Agriculture (SERCLA), Shanghai 201415, China
3
College of Environmental State Key Laboratory of Pollution Control and Resource Reuse (Tongji University), Shanghai 200092, China
*
Authors to whom correspondence should be addressed.
Catalysts 2018, 8(7), 272; https://doi.org/10.3390/catal8070272
Received: 24 May 2018 / Revised: 2 July 2018 / Accepted: 2 July 2018 / Published: 4 July 2018
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Abstract

[email protected]2O-graphene ([email protected]2O-G) with different concentrations of graphene was synthesized using a facile in situ precipitation method. The photocatalysts were characterized by field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS). The antibioticsulfamethoxazole (SMX) degradationunder simulated solar light and visible light irradiationwas investigated to evaluate photocatalytic performance. The composite photocatalyst [email protected]2O-G with 2.5 wt% graphene presented the highest activity among all the prepared composite photocatalysts. The coupling of graphene and Ag0 increased the photocatalyticactivity and stability of pure Ag2O. Under higher SMX concentrations, the adsorption, not the photocatalytic ability, playeda crucial role during the SMX removal process. On the basis of the characterization and reactive oxygen species (ROS) scavenging experiments, a separation and transfer mechanism of photogenerated carriers was proposed. In the photocatalytic degradation of SMX, the major active species wereidentified as photogenerated holes; photogenerated electrons in the conduction band (CB) of Ag2O could not transfer to graphene through Ag0due to the more negative reduction potential of graphene. This is an important result regardinggraphene and Ag0 roles which isdifferent from that for the photocatalytic degradation of dyes. This researchmay provide new insights into photocatalytic processes for the degradation of non-dye pollutants bycomposite materials to guidethe design of highly efficient reaction systems. View Full-Text
Keywords: [email protected]2O-graphene; graphene; Ag; visible light; sulfamethoxazole; photocatalytic mechanism [email protected]2O-graphene; graphene; Ag; visible light; sulfamethoxazole; photocatalytic mechanism
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Zhou, L.; Zou, G.; Deng, H. The Roles of Graphene and Ag in the Hybrid [email protected]2O-Graphene for Sulfamethoxazole Degradation. Catalysts 2018, 8, 272.

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