Carbon Quantum Dots Modified BiOCl Ultrathin Nanosheets with Enhanced Molecular Oxygen Activation Ability for Broad Spectrum Photocatalytic Properties and Mechanism Insight

Abstract

In this paper, carbon quantum dots (CQDs) modified BiOCl ultrathin nanosheets photocatalyst was synthesized via a facile solvothermal method. The structures, morphologies, optical properties, and photocatalytic properties were investigated in detail. The photocatalytic activity of the obtained CQDs modified BiOCl ultrathin nanosheets photocatalyst was evaluated by the degradation of bisphenol A (BPA) and rhodamine B (RhB) under ultraviolet, visible, and near-infrared light irradiation. The CQDs/BiOCl materials exhibited significantly enhanced photocatalytic performance as compared with pure BiOCl and the 5 wt % CQDs/BiOCl materials displayed the best performance, which showed a broad spectrum of photocatalytic degradation activity. The main active species were determined to be hole and O2•- under visible light irradiation by electron spin resonance (ESR) analysis, XPS valence spectra, and free radicals trapping experiments. The crucial role of CQDs for the improved photocatalytic activity was mainly attributed to the superior electron transfer ability, enhanced light harvesting, and boosted catalytic active sites.

A Carbon Quantum Dots/Porous InVO4 Microsphere Composite with Enhanced Photocatalytic Activity

“…As presented in Figure a, CQDs have a uniform dispersion without apparent aggregation with an average size about 3 nm. The lattice spacing of CQDs (Figure b) can be clearly observed and is determined to be 0.211 nm which corresponds to the literature , . As displayed in Figure a and Figure b, the maps of C‐K, In‐L, O‐K, and V‐K are well‐defined and have the same shape and location, demonstrating the uniform distribution of CQDs on the surface of p‐InVO 4 .…”

Graphene-Analogue Boron Nitride Modified Bismuth Oxyiodide with Increased Visible-Light Photocatalytic Performance

“…The contact area of the BiOI with BN is decreased when the BN amount which is introduced is low. On the contrary, too much BN will cover the surface of the BiOI bulk and cover the active sites of the material, thereby weaken the photocatalytic activity of the material . In order to show the photocatalytic properties of 3.0 wt.% BN‐BiOI more intuitively, the absorption spectrum of MO as time was shown in Figure b.…”

Ionic liquid-assisted bidirectional regulation strategy for carbon quantum dots (CQDs)/Bi4O5I2 nanomaterials and enhanced photocatalytic properties

“…The BiOX possessed the structure of [Bi 2 O 2 ] slabs interleaved with double slabs of halogen atoms could induce the generation of internal static electric fields so as to realize the effective separation of photogenerated carriers and bring about the remarkable photocatalytic activity [20]. Among these, Bismuth oxyiodine (BiOI) has been widely investigated by right of the stronger optical absorptivity in the visible light range.…”