A Z-scheme g-C 3 N 4 /Ag/MoS 2 ternary plasmonic photocatalyst in a flowerlike architecture of diameter about 0.4− 0.6 μm is successfully synthesized by a reliable and effective method. The as-synthesized g-C 3 N 4 /Ag/MoS 2 photocatalyst showed excellent improvement for visible-light absorption and separation efficiency of photoinduced electron−hole pairs. The g-C 3 N 4 / Ag/MoS 2 system exhibits optimum visible-light-induced photocatalytic activity in degrading Rhodamin B (RhB), which is 9.43fold and 3.56-fold of Ag/MoS 2 and g-C 3 N 4 /MoS 2 systems, and 8.78-fold and 2.08-fold in the production of hydrogen (H 2 ) out of water, respectively. The excellent photocatalytic activities are attributed to the synergetic effects of Ag, g-C 3 N 4 , and MoS 2 nanophase structures in the g-C 3 N 4 /Ag/MoS 2 composites, which result in a Z-scheme-mechanism-assisted fast separation and slow recombination of photoinduced electron−hole pairs and thereby higher photocatalytic activity. KEYWORDS: g-C 3 N 4 -based nanocomposite, Silver, MoS 2 flower, Z-scheme mechanism, Photocatalysis
The development of optical imaging techniques has led to significant advancements in single‐nanoparticle tracking and analysis, but these techniques are incapable of label‐free selective nanoparticle recognition. A label‐free plasmonic imaging technology that is able to identify different kinds of nanoparticles in water is now presented. It quantifies the plasmonic interferometric scattering patterns of nanoparticles and establishes relationships among the refractive index, particle size, and pattern both numerically and experimentally. Using this approach, metallic and metallic oxide particles with different radii were distinguished without any calibration. The ability to optically identify and size different kinds of nanoparticles can provide a promising platform for investigating nanoparticles in complex environments to facilitate nanoscience studies, such as single‐nanoparticle catalysis and nanoparticle‐based drug delivery.
TiO-based nanorods (TNRs) were self-assembled on large graphitic carbon nitride (g-CN) sheets via the solvothermal-assisted route. The results demonstrated that the effective anchoring of TNRs (a side length of ca. 200-300 nm) was highly dispersed on the surface of whole g-CN sheets. The shift in the Ti 2p XPS core level spectrum indicated an increase in the net positive charge of the Ti ions, ensuring the formation of an interface between TNRs and g-CN. The charge transferred from g-CN sheets to TNRs effectively prevented the recombination of excited charges, which is consistent with the significant quenching of PL. The extent of visible-light-sensitive photocatalytic (PC) activity was evaluated by the removal of potassium dichromate (Cr(vi)) or the degradation of rhodamine B (RhB). The photocatalytic removal of Cr(vi) using RhB was effectively improved. The synergistic effect between the removal of Cr(vi) and degradation of RhB was revealed by multiple utilization of TNRs/g-CN for PC activity. The effective suppression of the recombination of photo-induced charges and the absorption of RhB was responsible for the enhancement in the PC activity. An alternate mechanism for enhanced visible-light photocatalytic activity was also considered.
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