关键字：Electron spin resonance spectroscopy;Carbon - Charge transfer - Complexation - Composite films - Electronic properties - Free radical reactions - Graphene - High resolution transmission electron microscopy - Image enhancement - Light - Magnetic moments - Organic carbon - Photocatalysis - Photocatalysts - Photodegradation - Photoluminescence spectroscopy - Rhodium - Solutions - Transmission electron microscopy - X ray diffraction - X ray photoelectron spectroscopy;BiOBr/RGO/pg-C3N4 - Diffuse reflectance spectroscopy - Optical and electronic properties - Photocatalytic activities - Photoelectrochemical measurements - Visible light photocatalytic activity - Visible-light-driven - Z-scheme
摘要：The novel BiOBr/reduced graphene oxide/protonated g-C<inf>3</inf>N<inf>4</inf>(BiOBr/RGO/pg-C<inf>3</inf>N<inf>4</inf>) composites were successfully synthesized by using a facile solvothermal synthesis method. The structure, morphology, optical and electronic properties were explored by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV–Vis diffuse reflectance spectroscopy (DRS), and photoelectrochemical measurement. The photocatalytic activities of as-synthesized samples were evaluated by the degradation of Rhodamine B (Rh B) and tetracycline hydrochloride (TC) aqueous solution under visible light irradiation (λ > 420nm). Compared with BiOBr, protonated g-C<inf>3</inf>N<inf>4</inf>(pg-C<inf>3</inf>N<inf>4</inf>), BiOBr/pg-C<inf>3</inf>N<inf>4</inf>and RGO/pg-C<inf>3</inf>N<inf>4</inf>, BiOBr/RGO/pg-C<inf>3</inf>N<inf>4</inf>composites exhibited higher photocatalytic activity. The total organic carbon (TOC) removal ratios of Rh B and TC over 10% BiOBr/RGO/pg-C<inf>3</inf>N<inf>4</inf>were 88% and 59%, respectively. The excellent photcatalytic performance was investigated by photoluminescence spectroscopy (PL), the radical quenching and electron spin resonance experiments. A Z-scheme charge transfer mechanism was proposed, in which RGO acted as an electron transfer mediator. It was worth pointing out that the closely contacted two-dimensional interface among the BiOBr, the RGO and pg-C<inf>3</inf>N<inf>4</inf>promoted the separation and transfer of photo-generated charge carriers, and thus enhanced the photocatalytic efficiency.<br/> © 2017 Elsevier B.V.
卷号：437
期号：1
是否译文：否