Preparation and visible light photocatalytic activity of carbon quantum dots/TiO2 nanosheet composites

The visible light catalytic properties of carbon quantum dots/ZnO nanoflowers composites

“…In this system, after C QDs were introduced into the composites system, a mass of visible light was converted to shorter wavelength, which may increase the photo-generated electron-hole pairs to enhance the photocatalytic activity. At the same time, C QDs can accept the photo-generated electrons from semiconductor and the introduction of C QDs to semiconductor has significantly increased its transient photocurrent response and decreased its PL intensity, the similar results are reported by Liu et al and Du et al [20,34], which manifest that the C QDs can promote the separation of photo-generated electron-hole pairs [35]. It is interesting that there is an obvious decrease with excess amount of C QDs.…”

“…Previous studies have found that C QDs can enhance the photocatalytic activity under visible light irradiation [17]. Then Yang et al [18] and Ahmad et al [19] have prepared C/ZnO composites to improve photocatalytic property, Liu et al [20] have prepared C QDs/TiO 2 nanosheet to improve the visible light photocatalytic activity. Moreover, as known, photocatalytic property of ZnO nanomaterial intensely depends on the external morphology such as surface morphology, size or special three-dimensional structure, therefore, many studies have been made on the morphology controlled fabrication of ZnO to improve its photocatalysis.…”

Highly Crystallized C-Doped Mesoporous Anatase TiO2 with Visible Light Photocatalytic Activity

“…Moreover, it is well known that the photocatalytic efficiency of TiO 2 can be improved by control of morphology and structure of TiO 2 [5,[9][10][11]. TiO 2 with various morphologies, such as nanorods, nanotubes, nanosheets, and nanowires, have been prepared and investigated as phocatalysts [9][10][11][12][13][14][15][16][17][18]. TiO 2 immobilized on substrates [19,20] as well as TiO 2 into thin film [13] have also been studied.…”

Carbon Quantum Dots/Bi2WO6 Composites for Efficient Photocatalytic Pollutant Degradation and Hydrogen Evolution

“…Up to date, the design of CQDs/semiconductor composites (CQDs/TiO 2 , CQDs/SiO 2 , CQDs/ Fe 2 O 3 , CQDs/Cu 2 O, CQDs/Ag 3 PO 4 , CQDs/C 3 N 4 Þ with enhanced photocatalytic performance has been achieved. [19][20][21][22][23][24][25][26] Considering the remarkable properties of CQDs and the limitations of the Bi 2 WO 6 photocatalytic system, the combination of CQDs and Bi 2 WO 6 may be regarded as an ideal strategy to construct an e±cient composite photocatalyst.…”