Covalent organic framework-supported Fe–TiO<sub>2</sub> nanoparticles as ambient-light-active photocatalysts

Zhang, Yumin; Hu, Yueyun; Zhao, Jianhong; Park, Eunsol; Jin, Yinghua; Liu, Qingju; Zhang, Wei

doi:10.1039/c9ta03649k

Cited by 115 publications

(78 citation statements)

References 45 publications

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“…There are mainly two reasons to select these two dyes. First, the degradation of these two dyes has been widely used as model reactions to probe the photocatalytic ability of various materials including metal and oxide nanoparticles, quantum dots, and carbon-based nanomaterials [88][89][90]. Second, these two dyes are both positively charged, while our C-dots have a negative zeta potential (−11.6).…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Peng

Zhou

et al. 2020

Nanomaterials

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Carbon dots (C-dots) were facilely fabricated via a hydrothermal method and fully characterized. Our study shows that the as-synthesized C-dots are nontoxic, negatively charged spherical particles (average diameter 4.7 nm) with excellent water dispersion ability. Furthermore, the C-dots have a rich presence of surface functionalities such as hydroxyls and carboxyls as well as amines. The significance of the C-dots as highly efficient photocatalysts for rhodamine B (RhB) and methylene blue (MB) degradation was explored. The C-dots demonstrate excellent photocatalytic activity, achieving 100% of RhB and MB degradation within 170 min. The degradation rate constants for RhB and MB were 1.8 × 10−2 and 2.4 × 10−2 min−1, respectively. The photocatalytic degradation performances of the C-dots are comparable to those metal-based photocatalysts and generally better than previously reported C-dots photocatalysts. Collectively considering the excellent photocatalytic activity toward organic dye degradation, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, the C-dots fabricated in this work are demonstrated to be a promising alternative for pollutant degradation and environment protection.

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Section: Resultsmentioning

confidence: 99%

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Peng

Zhou

et al. 2020

Nanomaterials

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“…It exhibited a volcanic trend with an increasing weight percentage of Cu and reached the highest C 2 yield over Cu 0.1 /PC-50 (1.2 mmol h À1 ). This trend was probably observed because an excessive amount of CuO could act as a recombination centre of photoinduced electrons and holes, [18] as further discussed later.…”

Section: Angewandte Chemiementioning

confidence: 88%

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Xie

Rao

et al. 2020

Angewandte Chemie

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Oxidative coupling of methane (OCM) is considered one of the most promising catalytic technologies to upgrade methane. However, C 2 products (C 2 H 6 /C 2 H 4) from conventional methane conversion have not been produced commercially owing to competition from overoxidation and carbon accumulation at high temperatures. Herein, we report the codeposition of Pt nanoparticles and CuO x clusters on TiO 2 (PC-50) and use of the resulting photocatalyst for OCM in a flow reactor operated at room temperature under atmospheric pressure for the first time. The optimized Cu 0.1 Pt 0.5 /PC-50 sample showed a highest yield of C 2 product of 6.8 mmol h À1 at a space velocity of 2400 h À1 , more than twice the sum of the activity of Pt/PC-50 (1.07 mmol h À1) and Cu/PC-50 (1.9 mmol h À1), it might also be the highest among photocatalytic methane conversions reported so far under atmospheric pressure. A high C 2 selectivity of 60 % is also comparable to that attainable by conventional high-temperature (> 943 K) thermal catalysis. It is proposed that Pt functions as an electron acceptor to facilitate charge separation, while holes could transfer to CuO x to avoid deep dehydrogenation and the overoxidation of C 2 products.

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“…[10] Thus, ul-trafineM NPs promote photocatalytic reactions owing to the LSPR effect, which is thermodynamically not feasible in the ground state. [11] In this respect, silver nanoparticles (AgNPs) are appealing owing to their LSPR effecti nt he visible light region (400-800nm). [12] Moreover,p hotocatalytic routes under visible light are often lesst oxic, involves less energy consumption, and are more eco-friendly compared with conventionalw etchemicalm ethods.…”

Section: Introductionmentioning

confidence: 99%

Nucleation of Tiny Silver Nanoparticles by Using a Tetrafacial Organic Molecular Barrel: Potential Use in Visible‐Light‐Triggered Photocatalysis

Mondal

Bhandari

Mukherjee

2020

Chemistry A European J

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Coordination-driven self-assembly of discrete molecular architectures of diverses hapesa nd sizes has been well studied in the last three decades. Use of dynamic imine bonds ford esigning analogous metal-free architectures has become ag rowing challenge recently.T his article reports an organic molecular barrel (OB4 R)a sapotential templatef or nucleation and stabilization of very tiny (< 1.5 nm) Ag nanoparticles (AgNPs). Imine bond condensation of ar igid tetraaldehyde with af lexible diamine followed by imine-bond reduction yielded the discrete tetragonal organic barrel (OB4 R). The presence of am olecular pocket ornamented with eight diamine moieties gives the potential for encapsulation of silver(I). The organic barrelw as finally used as amolecular vesself or the controlled nucleation of silver nanopar-ticles (AgNPs) with fine size tuning through bindingo fA g I ions in the confined space of the barrel followed by reduction. Transmission electronm icroscopy (TEM) analysiso ft he Ag 0 @OB4 R composite revealed that the mean particles ize is 1.44 AE 0.16 nm. The composite materialh as approximately 52 wt %s ilver loading.T he barrel-supported ultrafine AgNPs [Ag 0 @OB4 R ]a re found to be an efficient photocatalystf or facile Ullmann-type aryl-amination coupling of haloarenes at ambient temperature without using anya dditives. The catalyst was stable fors everal cycles of reuse without any agglomeration. The new composite Ag 0 @OB4 R represents the first example of discrete organic barrel-supported AgNPs employed as ap hotocatalyst in Ullmann-typec oupling reactions at room temperature.

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Covalent organic framework-supported Fe–TiO₂ nanoparticles as ambient-light-active photocatalysts

Abstract: COF-supported ultrafine crystalline Fe–TiO2 nanoparticles were prepared, which show ambient light photocatalytic activity with high efficiency, stability, and recyclability.

Cited by 115 publications

References 45 publications

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor

Nucleation of Tiny Silver Nanoparticles by Using a Tetrafacial Organic Molecular Barrel: Potential Use in Visible‐Light‐Triggered Photocatalysis

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Covalent organic framework-supported Fe–TiO2 nanoparticles as ambient-light-active photocatalysts

Abstract: COF-supported ultrafine crystalline Fe–TiO2 nanoparticles were prepared, which show ambient light photocatalytic activity with high efficiency, stability, and recyclability.

Cited by 115 publications

References 45 publications

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Platinum‐ and CuOx‐Decorated TiO2 Photocatalyst for Oxidative Coupling of Methane to C2 Hydrocarbons in a Flow Reactor

Nucleation of Tiny Silver Nanoparticles by Using a Tetrafacial Organic Molecular Barrel: Potential Use in Visible‐Light‐Triggered Photocatalysis

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Resources

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Covalent organic framework-supported Fe–TiO₂ nanoparticles as ambient-light-active photocatalysts

Platinum‐ and CuO_x‐Decorated TiO₂ Photocatalyst for Oxidative Coupling of Methane to C₂ Hydrocarbons in a Flow Reactor