Article
Chemistry, Multidisciplinary
Yujie Liu, Haijun Zhou, Jinling Wang, Ding Yu, Zhaolei Li, Rui Liu
Summary: Core-shell nanoparticles (Fe3O4@PDA) wrapped with Ag were prepared using a simple and green synthesis method. The obtained nanoparticles showed excellent catalytic activity and selectivity, indicating their potential applications in various fields.
Article
Chemistry, Physical
Ricca Rahman Nasaruddin, Max J. Hulsey, Jianping Xie
Summary: The bimetallic AuAg NCs with silver doping showed enhanced catalytic activity, better stability, and provided a wider opportunity to tailor the catalytic properties of atomically precise Au-based 25-metal atom NCs by engineering their metal composition.
MOLECULAR CATALYSIS
(2022)
Article
Engineering, Environmental
Ru Hu, Rui Xu, Zizhu Wang, Junyou Wang, Shenghu Zhou
Summary: In this study, Au nanoparticles were synthesized and encapsulated in hollow porous silica nanospheres (Au@HPSNs). The Au@HPSNs consisted of extremely small Au nanoclusters (-1.3 nm) enclosed in high specific surface area (-800 m2/g) HPSNs. The formation of PEI-PAA@SiO2 core-shell structures was achieved by using electrostatic attraction between poly(acrylic acid) (PAA) anions and protonated poly(ethylenimine) (PEI) in an ethanol-water system. The Au@HPSNs were obtained by soaking PEI-PAA@SiO2 in HAuCl4 solution and subsequent calcination. The Au@HPSNs exhibited highly efficient catalytic activity for 4-nitrophenol (4-NP) reduction with NaBH4, surpassing the current record for heterogeneous Au-based catalysts in 4-NP reduction. The enhanced performance of Au@HPSNs can be attributed to the ultra-fine Au nanoclusters and the small mass transfer hindrance with high specific surface area hollow porous silica.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Paritosh Mahato, Shashi Shekhar, Rahul Yadav, Saptarshi Mukherjee
Summary: This study comprehensively elucidates the role of the core and electrostatic surface of metal nanoclusters in catalytic reduction reactions. The electrostatic surface dramatically modulates the reactivity of metal nanoclusters.
Article
Materials Science, Multidisciplinary
Haejoo Moon, Younghun Kim
Summary: The study investigated the use of core-satellite structures in photothermal-mediated catalytic reactions, enhancing the photothermal effect by adjusting the structure and spacing of HAuNPs. The results demonstrated that localized heating effectively increased catalytic activity without the need to heat the entire solution additionally.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Multidisciplinary Sciences
Chun-Yu Liu, Shang-Fu Yuan, Song Wang, Zong-Jie Guan, De-en Jiang, Quan-Ming Wang
Summary: This study uncovers the role of the amidinate ligand in yielding two closely related copper hydride clusters with different catalytic hydrogenation activities. The researchers synthetized stable copper hydride clusters using ligand engineering strategy and observed reversible interconversion between the clusters triggered by solvent. Deuteration experiments demonstrated that the type of hydride in the clusters dictates the catalytic activity.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Meriem Banou, Yubiao Niu, Fatima Ammari, Tom Dunlop, Richard E. Palmer, Chedly Tizaoui
Summary: The study presents a new catalyst (AuNP/GNP/MgAl-LDH) consisting of gold nanoparticles (AuNP) supported on graphene nanoplatelets (GNP) intercalated in MgAl layered double hydroxides (MgAl-LDH). The catalyst was used for the reduction of 4-nitrophenol to 4-aminophenol using NaBH4 as a reducing agent. Characterization techniques such as FTIR, XRD, STEM, TEM, and BET specific surface area were employed. The results showed that AuNP/GNP/MgAl-LDH exhibited the highest reaction rate constant and stability after five repeated cycles.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Chemistry, Multidisciplinary
Rocio Lopez-Domene, Krishan Kumar, Jose Eduardo Barcelon, Gabriela Guedes, Ana Beloqui, Aitziber L. Cortajarena
Summary: Metalloenzymes are exemplary systems that combine an organic scaffold with a functional inorganic entity to produce excellent redox catalysts. Inspired by these natural biomolecules, biomolecular templates have garnered significant attention for controlled synthesis of inorganic nanostructures. In this study, protein-templated platinum (Pt)-based nanoclusters of different sizes and compositions were investigated, demonstrating remarkable oxidase, catalase, and reductase-like activities. The size of the nanoclusters was found to be the most prominent factor influencing the catalytic performance of the nanozymes. Additionally, protein-templated nanozymes were successfully used as co-catalysts with enzymes for coupled reactions, under both sequential and concurrent one-pot conditions. This study provides valuable insights into nanozyme design and their application in complex catalytic systems.
Article
Chemistry, Multidisciplinary
Rocio Lopez-Domene, Krishan Kumar, Jose Eduardo Barcelon, Gabriela Guedes, Ana Beloqui, Aitziber L. Cortajarena
Summary: Metalloenzymes are excellent redox catalysts that combine an organic scaffold with a functional inorganic entity. Inspired by these natural biomolecules, protein-templated nanostructures have gained attention for controlled synthesis. This study focuses on protein-templated Pt nanoclusters of different sizes and compositions, which exhibit remarkable oxidase, catalase, and reductase-like activities. The size of the nanocluster was found to be the key factor determining the performance of the nanozymes. Furthermore, protein-templated nanozymes were shown to be potential co-catalysts for coupled reactions. This study provides insights into nanozyme design and their applications in complex catalytic systems.
Article
Chemistry, Multidisciplinary
Xia Xu, Liming Yang, Yanjun Cui, Bing Hu
Summary: The successful development of efficient and stable catalysts for 4-nitrophenol (4-NP) reduction reactions is important for environmental and ecological benefits. Fe3O4@Pt exhibits excellent catalytic performance for 4-NP reduction due to the synergistic effect between Fe and Pt, but suffers from instability. In this study, a stable composite nanomaterial is synthesized by utilizing the small-scale organic compound 2-hydroxyethylamine as a surfactant. The influence of monochromatic light and temperature on the kinetics of 4-NP reduction reaction by 2-hydroxyethylamine stabilized Fe3O4@Pt is investigated. The results show that both temperature and monochromatic light radiation have an impact on the kinetic regulation, with increased temperature promoting catalytic rate and monochromatic light radiation inducing agglomeration and inhibiting catalytic rate. This study provides a new approach for developing and regulating catalysts for heterogeneous catalysis reactions.
Article
Chemistry, Inorganic & Nuclear
Yan-Li Gao, Xueli Sun, Xiongkai Tang, Zhenlang Xie, Guolong Tian, Zi-Ang Nan, Huayan Yang, Hui Shen
Summary: A novel alkynyl-stabilized silver-copper alloy nanocluster was synthesized and it was found that the structure of the alkynyl ligands played an important role in dictating the structure of the nanocluster. This nanocluster showed high performance in the catalytic hydrogenation of 4-nitrophenol.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Qiaoya Zhu, Wenjing Zhang, Jun Cai, Jin Li, Lian Zhong, Shuai Pu, Aifeng Li
Summary: Gold nanoparticles were synthesized using chitosan as a reducing agent and stabilizer, and their catalytic activity in the reduction of nitrophenol was investigated. The results showed that the morphology of the nanoparticles could be controlled by adjusting the concentration, molecular weight, and deacetylation degree of chitosan. The catalytic activity of the nanoparticles was found to be dependent on their morphology and the nature of the reducing agent and stabilizer.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Multidisciplinary
Danyi Li, Lin Lin, Manli Lu, Linfan Li, Jihao Li
Summary: The magnetic graphene noble metal aerogels (GA-Fe3O4-Au-(ethanol)) were prepared through self-assembly induced by radiation reduction. The prepared material GA-Fe3O4-Au-(ethanol) can be easily attracted by a magnet. Meanwhile, GA-Fe3O4-Au-(ethanol) successfully achieved the degradation of 4-nitrophenol (4-NP), an environmentally harmful pollutant. It is worth noting that the prepared materials exhibited better catalytic performance than general noble metal catalysts, and the content of noble metals in the composite significantly influenced the catalytic reaction rate. The successful preparation of this material provides a feasible approach for treating the pollutant 4-NP.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Applied
Krishnamoorthy Shanmugaraj, Tatiana M. Bustamante, Cecilia C. Torres, Cristian H. Campos
Summary: In this study, gold nanoparticles supported on aluminum oxide and titanate nanotubes were successfully synthesized and used as catalysts for the reduction of 4-nitrophenol. Through modification of the nanotube supports, the gold nanoparticles were uniformly dispersed, resulting in excellent catalytic activity and selectivity. The catalysts showed high operational stability even after multiple cycles. This research highlights the potential application of these gold nanoparticles catalysts in organic synthesis.
Article
Chemistry, Multidisciplinary
Helen K. Brown, Jamal El Haskouri, Maria D. Marcos, Jose Vicente Ros-Lis, Pedro Amoros, M. Angeles Ubeda Picot, Francisco Perez-Pla
Summary: This study reports on the synthesis of nine materials containing Cu, Ag, Au, and Ag/Cu nanoparticles deposited on magnetite particles coated with polydopamine. The materials were characterized using various techniques and their recyclability was evaluated. Catalysts prepared using soft reducing agents and/or thin polydopamine films showed the highest activity, while those reduced with NaBH4 remained stable for a longer time. The order of activity was Au>Ag>Cu, with Ag-based materials showing higher recyclability than Au-based materials.
