Novel GQD-PVP-CdS composite with enhanced visible-light-driven photocatalytic properties

作者：Fan, Tao; Li, Yinle; Shen, Jianfeng^*; Ye, Mingxin^*

来源：Applied Surface Science, 2016, 367: 518-527.

DOI：10.1016/j.apsusc.2016.01.194

• Graphene quantum dots
• Cadmium sulfide
• Photocatalysis
• Heterogeneous photocatalysts

A facile one-step hydrothermal method to synthesize graphene quantum dots (GQDs)-polyvinyl pyrrolidone (PVP)-CdS nanocomposite was reported. The nanocomposite was thoroughly characterized with X-ray diffraction, transmission electron microscopy, scanning electron microscopy, Fourier-transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and ultraviolet-visible spectroscopy. The results confirmed the formation of GQD-PVP-CdS composite with a uniform size (5-10 nm) and a relatively low band gap (E-g=2.23 eV). Moreover, the as-prepared composite exhibited enhanced photocatalytic activity toward the degradation of organic contaminants, with 92.3% of methyl orange (10 mg/L) removed after 3 hours of visible light illumination. This enhancement in photocatalytic activity was postulated to be attributed to the upconversion property of GQDs and a more efficient charge distribution between GQDs and CdS particles.

• 出版日期2016-3-30
• 单位复旦大学