Kinetically controlled synthesis of atomically precise silver nanocluster for catalytic reduction of 4-nitrophenol

Xian-hu Liu; Fei-hong Wang; Cong-ying Shao; Gang-feng Du; Bing-qing Yao

doi:10.1007/s12613-020-2186-x

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Kinetically controlled synthesis of atomically precise silver nanocluster for catalytic reduction of 4-nitrophenol

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Received: 3 August 2020; Revised: 3 September 2020; Accepted: 4 September 2020; Available online: 5 September 2020

Abstract

It is challenging to synthesize atom-precise silver nanoclusters (NCs), which is essential for the development of NCs. In this study, we report the synthesis of atom-precise silver NCs in high purity by a kinetically controlled strategy. The silver NCs were prepared using a mild reducing agent via a one-pot method. The as-prepared silver NCs were confirmed to be Ag₄₉(D-pen)₂₄ (D-pen: D-penicillamine) based on the discussion of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) and thermogravimetry (TG) characterizations. Interface structures of the silver NCs were illustrated by both ¹H-NMR and FTIR spectroscopy. The silver NCs were supported on the active carbon (AC) to form the Ag NCs/AC which displayed excellent activity for the catalytic reduction of 4-nitrophenol with the kinetic reaction rate constant k of 0.21 min⁻¹, outperforming several catalysts reported previously. Besides, the catalytic activity of Ag NCs/AC kept almost constant after six times of recycle, suggesting its good stability.

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沈阳化工大学材料科学与工程学院沈阳 110142

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Kinetically controlled synthesis of atomically precise silver nanocluster for catalytic reduction of 4-nitrophenol

Corresponding author:

Xian-hu Liu E-mail: liuxhv@126.com

1. Department of Chemistry, Huaibei Normal University, Huaibei 235000, China

2. Henan Key Laboratory of High-temperature Structural and Functional Materials, National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials, Henan University of Science and Technology, Luoyang, 471003, China

3. Department of Public Teaching, Nanyang Medical College, Nanyang 473061, China

4. Department of School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore

Received: 3 August 2020
Revised: 3 September 2020
Accepted: 4 September 2020
Available online: 5 September 2020

Abstract: It is challenging to synthesize atom-precise silver nanoclusters (NCs), which is essential for the development of NCs. In this study, we report the synthesis of atom-precise silver NCs in high purity by a kinetically controlled strategy. The silver NCs were prepared using a mild reducing agent via a one-pot method. The as-prepared silver NCs were confirmed to be Ag₄₉(D-pen)₂₄ (D-pen: D-penicillamine) based on the discussion of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) and thermogravimetry (TG) characterizations. Interface structures of the silver NCs were illustrated by both ¹H-NMR and FTIR spectroscopy. The silver NCs were supported on the active carbon (AC) to form the Ag NCs/AC which displayed excellent activity for the catalytic reduction of 4-nitrophenol with the kinetic reaction rate constant k of 0.21 min⁻¹, outperforming several catalysts reported previously. Besides, the catalytic activity of Ag NCs/AC kept almost constant after six times of recycle, suggesting its good stability.

Kinetically controlled synthesis of atomically precise silver nanocluster for catalytic reduction of 4-nitrophenol

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