Z‐Scheme Flower‐Like SnO₂/g‐C₃N₄ Composite with Sn²⁺ Active Center for Enhanced Visible‐Light Photocatalytic Activity

Abstract

The invention of defect‐engineering motivated Z‐scheme photocatalytic complexes has been treated as an emerging opportunity to accomplish effective carrier separation and electron transfer in hybrid heterojunctions, contributing a novel approach to accomplish modified visible‐light driven photocatalytic performance compared to traditional nanocomposites. Exploring a desired carrier medium is crucial to support impressive electron transportation in Z‐scheme photocatalytic nanocomposites. Here, the role that the Sn2+/Sn4+ redox couple plays in the photocatalytic process is systematically studied by taking the flower‐like SnO2/layered g‐C3N4 with deficient Sn2+ reactive sites as an example, where the defect‐engineering can be introduced by heat treatment. The experimental results and computational simulations demonstrate that the deficient Sn2+ reactive sites can facilitate small molecule adsorption and boost the interfacial carrier separation and transfer in the photocatalytic procedure by bringing in the Sn2+/Sn4+ redox couple. This work provides a more in‐depth exploration of Z‐scheme photocatalytic‐system construction and is helpful to the development of defect‐engineering approaches with high photocatalysis performance.

Visible Light-Driven Sandwich-like g-C3N4-Catalyzed Oxidation to Produce Cumene Hydroperoxide

“…In addition, a broad peak was observed in the range from 3500 to 3000 cm –1 in the FT-IR spectra of the catalysts, which corresponded to the existence of free amino N–H and the O–H stretching vibrations. , Furthermore, an additional absorption peak was observed in the range from 1200 to 1600 cm –1 , which corresponded to the typical stretching vibration of the C 6 N 7 ring unit . The absorption peak observed at 1632 cm –1 was attributed to the C–N stretching vibration, and the absorption peaks at 1560 and 1410 cm –1 were attributed to the stretching vibration of the CN heterocyclic ring. , The absorption peaks at 1325 and 1250 cm –1 could be attributed to the tensile vibration of C–N–C, whereas those at 887 and 810 cm –1 corresponded to the N–H-deformed bending vibration of the azine ring unit …”

“…35 The absorption peak observed at 1632 cm −1 was attributed to the C−N stretching vibration, and the absorption peaks at 1560 and 1410 cm −1 were attributed to the stretching vibration of the C�N heterocyclic ring. 36,37 The absorption peaks at 1325 and 1250 cm −1 could be attributed to the tensile vibration of C−N−C, whereas those at 887 and 810 cm −1 corresponded to the N−Hdeformed bending vibration of the azine ring unit. 38 Although the experimental conditions of the traditional thermal polymerization method are mild and the sample yield is large, 39 the agglomeration of the prepared samples and the difficulty in controlling the special morphology of the synthesized samples have restricted the effective application of this method.…”

Ultrafine ZnCo2O4 QD-incorporated carbon nitride mediated peroxymonosulfate activation for norfloxacin oxidation: performance, mechanisms and pathways

“…3), C 1s and Zn 2p were found to have undergone no chemical change aer loading ZnCo 2 O 4 on g-C 3 N 4 . In the C 1s core level analysis, the peak at 284.6 eV was linked to the indenite carbon adsorbed on the surface or the sp 3 graphitic carbon generated during the polymerization, while the 288.0 eV binding energy belongs to sp 2 hybrid carbon in N-C]N. 44 The signal at 398.4 eV in the N 1s core level analysis of g-C 3 N 4 was attributed to the hybrid aromatic nitrogen atom (C-N]C), while the peak of 400.2 eV denotes a tertiary nitrogen (N-(C) 3 or C-NH-C) group. Besides, a broad peak of 404.2 eV was generated by p-p excitation between stacked interlayers.…”

Emerging heterostructured C3N4photocatalysts for photocatalytic environmental pollutant elimination and sterilization

“…[7][8][9][10][11][12][13][14][15] Over recent decades, a considerable number of semiconductors such as metal oxides, metal sulfides, and nitride materials have been exploited as photocatalysts for various photocatalytic reactions. [16][17][18][19][20] Among them, graphitic carbon nitride (g-C 3 N 4 ) possessing outstanding light-response ability has shown great promise because of its facile synthesis, tunable band gap structure, good chemical stability, and environmentally friendly properties. [21][22][23][24][25] Since the pioneering research regarding photoinduced water splitting over g-C 3 N 4 was reported in 2009, 26 lots of studies have been conducted to broaden the application of C 3 N 4 based photocatalysts in different photocatalytic reactions such as toxic organic pollutant elimination, heavy metal ion reduction, CO 2 conversion and bacterial inactivation.…”