Rapid and facile synthesis of Au nanoparticle-decorated porous MOFs for the efficient reduction of 4‑nitrophenol

Hu, Congyi; Yang, Changping; Wang, Xue; Wang, Xiaoyan; Zhen, Shu Jun; Zhan, Li; Huang, Chengzhi; Li, Yuanfang

doi:10.1016/j.seppur.2022.121801

Cited by 27 publications

(14 citation statements)

References 37 publications

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“…The separation of reactor units and high dispersibility of metal NPs was crucial to ensure the molecularsize selectivity and keep the activity of metal sites. 77,78 Additionally, a spatial confinement effect offered by mesoporous shells with hierarchical pore structures and large surface areas contributed to the easy accessibility of reactants with high instantaneous concentration to active sites and rapid diffusion of products to the bulk solution because of μ , where α represents the bulk solution and β denotes the interior void of the yolk−shell particles, resulting in a driving force to facilitate the conversion from 4-NP to 4-AP. A similar confinement effect was presented for Co 3 O 4 NPs encapsulated by porous MOFs for 4-chlorophenol degradation and was reported for Pd nanoclusters confined in the MOF@covalent organic polymer (COP) for catalytic hydrogenation, 79,80 implying the superiority and scalability of those yolk−shell-structured nanoreactors for various catalytic applications.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Wang,

Zhang,

Zhang

et al. 2023

Inorg. Chem.

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Tuning the surface chemical property and the local environment of nanocrystals is crucial for realizing a high catalytic performance in various reactions. Herein, we aim to elucidate the structure sensitivity of Pd facets on the surface catalytic hydrogenation reaction and to identify what role the nanoconfinement effect plays in the catalytic properties of Pd nanocrystal catalysts. By controlling the coating structures of mesoporous silica (mSiO 2 ) on Pd nanocrystals with different exposed facets that include {100}, {111}, and {hk0}, we present a series of Pd@mSiO 2 nanoreactors in core−shell and yolk−shell structures and the discovery of a partial-coated structure, which can provide different types of nanoconfinement, and we propose a seed size-dominated growth mechanism. We demonstrate that a superior activity was exhibited in Pd nanocrystals enclosed by the {hk0} facet as compared to the Pd{100} and Pd{111} facets, and substantially enhanced efficiency and stability were achieved in Pd@mSiO 2 particles with yolk−shell structures, indicating a crucial superiority of optimizing the configuration of crystal facets and nanoconfinement. Our study provides an efficient strategy to rationally design and optimize nanocatalysts for promoting catalytic performance.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Wang,

Zhang,

Zhang

et al. 2023

Inorg. Chem.

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“…The NaBH 4 solution concentration is considered a constant during the reaction process because of its large excess amount. The rate constant k app for the catalytic 4-NP reduction can be described by the pseudo-first-order kinetic equation: ln( C t / C 0 ) = − k app t , where C 0 and C t are the initial concentration and the concentration at time t of 4-NP, respectively. Figure f shows plots of ln( C / C 0 ) against time t , showing good linear correlations.…”

Section: Resultsmentioning

confidence: 99%

In Situ Implantation of Bi₂S₃ Nanorods into Porous Quasi-Bi-MOF Architectures: Enabling Synergistic Dissociation of Borohydride for an Efficient and Fast Catalytic Reduction of 4-Nitrophenol

et al. 2022

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for the catalytic reduction of 4-NP, delivering a high turnover frequency (TOF) of 1.67 × 10 −4 mmol mg −1 min −1 and an extremely high normalized rate constant (k nor ) of 435298 s −1 g −1 . The kinetic analysis and electrochemical tests indicate that this catalytic hydrogenation reduction follows the Langmuir−Hinshelwood mechanism. This study enriches the synthetic strategy of MOF-based derivatives and offers a new catalytic platform for hydrogenation reduction reactions.

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“…They both have five peaks at 38.18, 44.39, 64.58, 77.55, and 81.72°i ndexed to (111), ( 200), ( 220), (311), and (222) planes of face-centered cubic crystalline Au, respectively (PDF#00-004-0784). 15,16,41 This is also verified by subsequent XPS (Figure 8b) and TEM analyses (Figure 6f,g). Only peaks of gold can be seen in XRD because the peak of gold is too strong due to the high adsorption capacity, which covers the original peaks of the material.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Ultrahigh Capacity and Rapid Selective Recycling of Gold Ions by Organic Intercalated and Exfoliated Few-Layer Ti₃C₂T_x Nanosheets

Liu

Han

et al. 2022

ACS Sustainable Chem. Eng.

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For the sustainable development of the ecological environment in gold recycling, it is urgently desired to develop a more efficient and highly selective process for gold ions from ewaste or mineral lixivium. As a kind of emerging two-dimensional nanomaterials, Ti 3 C 2 T x has emerged as a rapidly developing novel water treatment material. Herein, the preparation of few-layer Ti 3 C 2 T x nanosheets and their performance for recycling of gold ions were studied. Notably, it exhibits an impressive capacity of 2973.57 mg/g at room temperature, almost 124 times that of commercially available activated carbon (24 mg/g), and an exciting selectivity for Au(III) in the presence of competing ions due to perfectly weak reduction caused by the removal of the Al layer. The Langmuir isotherm and pseudo-second-order kinetic model can accurately depict the rapid adsorption process. Additionally, it can be regenerated effectively by thiourea and exhibits excellent reutilization. A critical mechanism involves an adsorptive−reduction pathway between Au(III) and active Ti sites. Excellent performance in real lixiviums from e-waste and gold-bearing sludge is also exhibited, demonstrating great potential for Au(III) recycling. It may be a sustainable direction for the capture and separation of Au(III) and also lays the foundation for the interface control of Ti 3 C 2 T x and Au NPs as a catalyst and other functional materials.

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Rapid and facile synthesis of Au nanoparticle-decorated porous MOFs for the efficient reduction of 4‑nitrophenol

Cited by 27 publications

References 37 publications

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

In Situ Implantation of Bi₂S₃ Nanorods into Porous Quasi-Bi-MOF Architectures: Enabling Synergistic Dissociation of Borohydride for an Efficient and Fast Catalytic Reduction of 4-Nitrophenol

Ultrahigh Capacity and Rapid Selective Recycling of Gold Ions by Organic Intercalated and Exfoliated Few-Layer Ti₃C₂T_x Nanosheets

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Rapid and facile synthesis of Au nanoparticle-decorated porous MOFs for the efficient reduction of 4‑nitrophenol

Cited by 27 publications

References 37 publications

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

Integrated Optimization of Crystal Facets and Nanoscale Spatial Confinement toward the Boosted Catalytic Performance of Pd Nanocrystals

In Situ Implantation of Bi2S3 Nanorods into Porous Quasi-Bi-MOF Architectures: Enabling Synergistic Dissociation of Borohydride for an Efficient and Fast Catalytic Reduction of 4-Nitrophenol

Ultrahigh Capacity and Rapid Selective Recycling of Gold Ions by Organic Intercalated and Exfoliated Few-Layer Ti3C2Tx Nanosheets

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Product

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In Situ Implantation of Bi₂S₃ Nanorods into Porous Quasi-Bi-MOF Architectures: Enabling Synergistic Dissociation of Borohydride for an Efficient and Fast Catalytic Reduction of 4-Nitrophenol

Ultrahigh Capacity and Rapid Selective Recycling of Gold Ions by Organic Intercalated and Exfoliated Few-Layer Ti₃C₂T_x Nanosheets