Efficient porous carbon nitride/Ag3PO4 photocatalyst for selective oxidation of amines to imines: Z-scheme heterojunction and interfacial adsorption

Li, Wen; Q, Li; Wang, Zhuhan; Xu, Guichuan; Zheng, Huicai; Zhou, Limei; Chen, Zeqin

doi:10.1016/j.colsurfa.2022.129806

Cited by 6 publications

(4 citation statements)

References 57 publications

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“…The main reason is that the metallic silver nanoparticles exhibit the SPR effect and form the Schottky junction, trapping a large number of surface electrons, further prompting electrons to convert oxygen into • O 2 – . Therefore, although the conduction band of Ag 3 PO 4 is more positive than the standard reduction potential of O 2 / • O 2 – (−0.33 eV), it makes full use of the superoxide radical in the photocatalytic procedure. Attention is drawn to the photocatalytic degradation rate of NRFX for IAA-10 after the introduction of EDTA-2Na, BZQ, or IPA, which are all inhibited.…”

Section: Resultsmentioning

confidence: 99%

Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag₃PO₄ Tetrapods as a Photocatalyst for the Degradation of Contaminants

Yao,

Shen,

Chen

et al. 2024

ACS Appl. Nano Mater.

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A silver phosphate (Ag 3 PO 4 )/silver (Ag)/silver halide (AgX, X = Cl, Br, or I) ternary composite photocatalysts were prepared by loading Ag nanoparticles on Ag 3 PO 4 tetrapods followed with in situ halogenation. The interface charge transfer behavior in the Ag 3 PO 4 /Ag/AgX nanocomposite was studied, and the photocatalytic performance was also evaluated. The results show that the Ag 3 PO 4 /Ag/AgI photocatalyst exhibits higher photocatalytic activity than the other two photocatalysts due to the more matched band structure between AgI and Ag 3 PO 4 . An internal electric field (IEF) from Ag 3 PO 4 to AgI is formed at the heterogeneous interface, so the photogenerated electrons at the conduction band of AgI can rapidly transfer to the valence band of Ag 3 PO 4 and recombine with photogenerated holes, which is consistent with the S-scheme charge transfer mechanism. Meanwhile, the photogenerated electrons left at the conduction band of Ag 3 PO 4 can transfer to Ag nanoparticles due to the Schottky junction and react with oxygen to produce • O 2 − , which is proved to be the main active species in the photocatalytic procedure. This tandem junction modulated between the S-scheme heterojunction and Schottky junction promotes the efficient separation of photogenerated carriers, thus significantly increasing the average PL lifetime of electrons by 2.95 times. Therefore, the Ag 3 PO 4 /Ag/AgI photocatalyst exhibits excellent photocatalytic activity for the degradation of methylene blue and norfloxacin. The seven consecutive cyclic tests prove the good stability of the photocatalyst, thus showing the application potential in the field of sewage treatment.

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Section: Resultsmentioning

confidence: 99%

Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag₃PO₄ Tetrapods as a Photocatalyst for the Degradation of Contaminants

Yao,

Shen,

Chen

et al. 2024

ACS Appl. Nano Mater.

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“…The XRD pattern of CC/Ag 3 PO 4 shows diffraction peaks corresponding to both carbon fiber and Ag 3 PO 4 (JCPDS card No. 74-1876, labeled with ▼) [ 39 ]. As for the CC/ZnO@Ag 3 PO 4 composite, its XRD pattern displays strong diffraction peaks of Ag 3 PO 4 and extremely weak diffraction peaks of ZnO, which is probably due to the full coverage of ZnO by Ag 3 PO 4 .…”

Section: Resultsmentioning

confidence: 99%

Recyclable Carbon Cloth-Supported ZnO@Ag3PO4 Core–Shell Structure for Photocatalytic Degradation of Organic Dye

Guan

Wang

et al. 2023

Toxics

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The extensive use of organic dyes in industry has caused serious environmental problems, and photocatalysis is a potential solution to water pollution by organic dyes. The practical application of powdery photocatalysts is usually limited by the rapid recombination of charge carriers and difficulty in recycling. In this study, recyclable carbon cloth-supported ZnO@Ag3PO4 composite with a core–shell structure was successfully prepared by solvothermal treatment and subsequent impregnation–deposition. The as-prepared carbon cloth-supported ZnO@Ag3PO4 composite showed an improved photocatalytic activity and stability for the degradation of rhodamine B (RhB), a model organic dye, under visible light irradiation. The decomposition ratio of RhB reached 87.1% after exposure to visible light for 100 min, corresponding to a reaction rate constant that was 4.8 and 15.9 times that of carbon cloth-supported Ag3PO4 or ZnO alone. The enhanced performance of the composite can be attributed to the effectively inhibited recombination of photoinduced electron–hole pairs by the S-scheme heterojunction. The carbon fibers further promoted the transfer of charges. Moreover, the carbon cloth-supported ZnO@Ag3PO4 can be easily separated from the solution and repeatedly used, demonstrating a fair recyclability and potential in practical applications.

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“…[8] Among various advanced oxidation technologies, photocatalysis is a potential method to achieve high selectivity using O 2 as a green and mild oxidant. Some semiconductor photocatalysts have great potential in the synthesis of imines, such as TiO 2 , [9] In 2 S 3 , [10] BiOX (X = Cl, I, Br), [11] g-C 3 N 4 , [12] triazine photocatalysts. [13,14] In order to ensure the selectivity of imine products through coupling oxidation synthesis, homogeneous molecular catalysts have attracted extensive attention due to their advantages such as high activity and selectivity, tunable structure, and fine control of the active site environment.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Photocatalytic Selective Oxidation of Benzylamines over Cobalt Molecular Catalyst Covalently Bonded to Carboxyl Functionalized Carbon Nitride

Wang,

Li,

Guo

et al. 2023

Adv Energy and Sustain Res

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Photocatalysis is accepted as a promising method for selective oxidative coupling of amine to imine. However, owing to the rapid dehydrogenation of the generated imine intermediate of α‐amino hydrogen to butyronitrile, it remains a huge challenge to fabricate an exquisite catalyst with enhanced conversion and selectivity. Herein, a novel heterogeneous catalyst (Bpy‐CoCl2/CNCOOH) is developed, where carboxyl functionalized carbon nitride (CNCOOH) serves as a substrate material and couples with highly efficient cobalt‐aminopyridine (Bpy‐CoCl2) molecular catalyst through covalent bonding. The catalyst not only effectively facilitates the transfer of photogenerated charges, but also generates mildly oxidatively active species of superoxide radicals, which can effectively oxidize various functionalized benzylamines to corresponding imines in the presence of oxygen with at least 78.5% conversion and >99% selectivity using O2 as oxygen source, especially for the unmodified benzylamine with >99% conversion and >99% selectivity. This unique combination of a selective molecular catalyst and a simple and robust semiconducting material open new avenues for the selective oxidative coupling of amines.

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Efficient porous carbon nitride/Ag3PO4 photocatalyst for selective oxidation of amines to imines: Z-scheme heterojunction and interfacial adsorption

Cited by 6 publications

References 57 publications

Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag₃PO₄ Tetrapods as a Photocatalyst for the Degradation of Contaminants

Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag₃PO₄ Tetrapods as a Photocatalyst for the Degradation of Contaminants

Recyclable Carbon Cloth-Supported ZnO@Ag3PO4 Core–Shell Structure for Photocatalytic Degradation of Organic Dye

Efficient Photocatalytic Selective Oxidation of Benzylamines over Cobalt Molecular Catalyst Covalently Bonded to Carboxyl Functionalized Carbon Nitride

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Efficient porous carbon nitride/Ag3PO4 photocatalyst for selective oxidation of amines to imines: Z-scheme heterojunction and interfacial adsorption

Cited by 6 publications

References 57 publications

Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag3PO4 Tetrapods as a Photocatalyst for the Degradation of Contaminants

Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag3PO4 Tetrapods as a Photocatalyst for the Degradation of Contaminants

Recyclable Carbon Cloth-Supported ZnO@Ag3PO4 Core–Shell Structure for Photocatalytic Degradation of Organic Dye

Efficient Photocatalytic Selective Oxidation of Benzylamines over Cobalt Molecular Catalyst Covalently Bonded to Carboxyl Functionalized Carbon Nitride

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Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag₃PO₄ Tetrapods as a Photocatalyst for the Degradation of Contaminants

Ag/AgX (X = Cl, Br, or I) Nanocomposite Loaded on Ag₃PO₄ Tetrapods as a Photocatalyst for the Degradation of Contaminants