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Arif M, Rauf A, Raza H, Moussa SB, Haroon SM, Alzahrani AYA, Akhter T. Catalytic reduction of nitroarenes by palladium nanoparticles decorated silica@poly(chitosan-N-isopropylacrylamide-methacrylic acid) hybrid microgels. Int J Biol Macromol 2024; 275:133633. [PMID: 38964695 DOI: 10.1016/j.ijbiomac.2024.133633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 06/28/2024] [Accepted: 07/01/2024] [Indexed: 07/06/2024]
Abstract
Conversion of toxic nitroarenes into less toxic aryl amines, which are the most suitable precursors for different types of compounds, is done with various materials which are costly or take more time for this conversion. In this regards, a silica@poly(chitosan-N-isopropylacrylamide-methacrylic acid) Si@P(CS-NIPAM-MAA) Si@P(CNM) core-shell microgel system was synthesized through free radical precipitation polymerization (FRPP) and then fabricated with palladium nanoparticles (Pd NPs) by in situ-reduction method to form Si@Pd-P(CNM) and characterized with XRD, TEM, FTIR, SEM, and EDX. The catalytic efficiency of Si@Pd-P(CNM) hybrid microgels was studied for reduction of 4-nitroaniline (4NiA) under diverse conditions. Different nitroarenes were successfully transformed into their corresponding aryl amines with high yields using the Si@Pd-P(CNM) system as catalyst and NaBH4 as reductant. The Si@Pd-P(CNM) catalyst exhibited remarkable catalytic efficiency and recyclability as well as maintaining its catalytic effectiveness over multiple cycles.
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Affiliation(s)
- Muhammad Arif
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan.
| | - Abdul Rauf
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | - Hamid Raza
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | - Sana Ben Moussa
- Department of Chemistry, Faculty of Science and Arts, Mohail Asser, King Khalid University, Abha 61413, Saudi Arabia
| | - Shah M Haroon
- Department of Chemistry, School of Science, University of Management and Technology, Lahore 54770, Pakistan
| | | | - Toheed Akhter
- Department of Chemical and Biological Engineering, Gachon University, Seongnam 13120, Republic of Korea.
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2
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Chiu TH, Liao JH, Silalahi RPB, Pillay MN, Liu CW. Hydride-doped coinage metal superatoms and their catalytic applications. NANOSCALE HORIZONS 2024; 9:675-692. [PMID: 38507282 DOI: 10.1039/d4nh00036f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
Superatomic constructs have been identified as a critical component of future technologies. The isolation of coinage metal superatoms relies on partially reducing metallic frameworks to accommodate the mixed valent state required to generate a superatom. Controlling this reduction requires careful consideration in reducing the agent, temperature, and the ligand that directs the self-assembly process. Hydride-based reducing agents dominate the synthetic wet chemical routes to coinage metal clusters. However, within this category, a unique subset of superatoms that retain a hydride/s within the nanocluster post-reduction have emerged. These stable constructs have only recently been characterized in the solid state and have highly unique structural features and properties. The difficulty in identifying the position of hydrides in electron-rich metallic constructs requires the combination and correlation of several analytical methods, including ESI-MS, NMR, SCXRD, and DFT. This text highlights the importance of NMR in detecting hydride environments in these superatomic systems. Added to the complexity of these systems is the dual nature of the hydride, which can act as metallic hydrogen in some cases, resulting in entirely different physical properties. This review includes all hydride-doped superatomic nanoclusters emphasizing synthesis, structure, and catalytic potential.
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Affiliation(s)
- Tzu-Hao Chiu
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, Republic of China.
| | - Jian-Hong Liao
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, Republic of China.
| | - Rhone P Brocha Silalahi
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, Republic of China.
| | - Michael N Pillay
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, Republic of China.
| | - C W Liu
- Department of Chemistry, National Dong Hwa University, Hualien 97401, Taiwan, Republic of China.
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3
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Brown HK, El Haskouri J, Marcos MD, Ros-Lis JV, Amorós P, Úbeda Picot MÁ, Pérez-Pla F. Synthesis and Catalytic Activity for 2, 3, and 4-Nitrophenol Reduction of Green Catalysts Based on Cu, Ag and Au Nanoparticles Deposited on Polydopamine-Magnetite Porous Supports. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2162. [PMID: 37570480 PMCID: PMC10421209 DOI: 10.3390/nano13152162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 08/13/2023]
Abstract
This work reports on the synthesis of nine materials containing Cu, Ag, Au, and Ag/Cu nanoparticles (NPs) deposited on magnetite particles coated with polydopamine (PDA). Ag NPs were deposited on two PDA@Fe3O4 supports differing in the thickness of the PDA film. The film thickness was adjusted to impart a textural porosity to the material. During synthesis, Ag(I) was reduced with ascorbic acid (HA), photochemically, or with NaBH4, whereas Au(III), with HA, with the PDA cathecol groups, or NaBH4. For the material characterization, TGA, XRD, SEM, EDX, TEM, STEM-HAADF, and DLS were used. The catalytic activity towards reduction of 4-, 3- and 2-nitrophenol was tested and correlated with the synthesis method, film thickness, metal particle size and NO2 group position. An evaluation of the recyclability of the materials was carried out. In general, the catalysts prepared by using soft reducing agents and/or thin PDA films were the most active, while the materials reduced with NaBH4 remained unchanged longer in the reactor. The activity varied in the direction Au > Ag > Cu. However, the Ag-based materials showed a higher recyclability than those based on gold. It is worth noting that the Cu-containing catalyst, the most environmentally friendly, was as active as the best Ag-based catalyst.
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Affiliation(s)
- Helen K Brown
- Institut de Ciència dels Materials (ICMUV), c/Catedrático José Beltrán 2, Paterna, 46980 Valencia, Spain
| | - Jamal El Haskouri
- Institut de Ciència dels Materials (ICMUV), c/Catedrático José Beltrán 2, Paterna, 46980 Valencia, Spain
| | - María D Marcos
- Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de València-Universitat de València, Departamento de Química, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - José Vicente Ros-Lis
- Centro de Reconocimiento Molecular y Desarrollo Tecnológico (IDM), Unidad Mixta Universitat Politècnica de València-Universitat de València, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Spain
| | - Pedro Amorós
- Institut de Ciència dels Materials (ICMUV), c/Catedrático José Beltrán 2, Paterna, 46980 Valencia, Spain
| | - M Ángeles Úbeda Picot
- Departamento de Química Inorgànica, Universitat de València, Dr. Moliner 50, Burjassot, 46100 València, Spain
| | - Francisco Pérez-Pla
- Institut de Ciència dels Materials (ICMUV), c/Catedrático José Beltrán 2, Paterna, 46980 Valencia, Spain
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Gazil O, Bernardi J, Lassus A, Virgilio N, Unterlass MM. Urethane functions can reduce metal salts under hydrothermal conditions: synthesis of noble metal nanoparticles on flexible sponges applied in semi-automated organic reduction. JOURNAL OF MATERIALS CHEMISTRY. A 2023; 11:12703-12712. [PMID: 37346738 PMCID: PMC10281335 DOI: 10.1039/d2ta09405c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 02/04/2023] [Indexed: 06/23/2023]
Abstract
We report an additive-free one-pot hydrothermal synthesis of Au, Ag, Pd, and alloy AuPd nanoparticles (NPs) anchored on commercial polyurethane (PU) foams. While unable to reduce the precursor metal salts at room temperature, PU is able to serve as a reducing agent under hydrothermal conditions. The resulting NP@PU sponge materials perform comparably to reported state-of-the-art reduction catalysts, and are additionally very well suited for use in semi-automated synthesis: the NP anchoring is strong enough and the support flexible enough to be used as a 'catalytic sponge' that can be manipulated with a robotic arm, i.e., be repeatedly dipped into and drawn out of solutions, wrung out, and re-soaked.
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Affiliation(s)
- Olivier Gazil
- Universität Konstanz, Department of Chemistry, Solid State Chemistry Universitätsstrasse 10 D-78464 Konstanz Germany
- CREPEC, Department of Chemical Engineering, Polytechnique Montréal C.P. 6079 Succursale Centre-Ville Montréal Québec H3C 3A7 Canada
| | - Johannes Bernardi
- University Service Centre for Transmission Electron Microscopy, Vienna University of Technology Wiedner Hauptstrasse 8-10/137 A-1040 Vienna Austria
| | - Arthur Lassus
- CREPEC, Department of Chemical Engineering, Polytechnique Montréal C.P. 6079 Succursale Centre-Ville Montréal Québec H3C 3A7 Canada
| | - Nick Virgilio
- CREPEC, Department of Chemical Engineering, Polytechnique Montréal C.P. 6079 Succursale Centre-Ville Montréal Québec H3C 3A7 Canada
| | - Miriam M Unterlass
- Universität Konstanz, Department of Chemistry, Solid State Chemistry Universitätsstrasse 10 D-78464 Konstanz Germany
- Center for Molecular Medicine of the Austrian Academy of Sciences (CeMM) Lazarettgasse 14, AKH BT25.3 1090 Vienna Austria
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5
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Wang WL, Kanno A, Ishiguri A, Jin RH. Generation of sub-5 nm AuNPs in the special space of the loop-cluster corona of a polymer vesicle: preparation and its unique catalytic performance in the reduction of 4-nitrophenol. NANOSCALE ADVANCES 2023; 5:2199-2209. [PMID: 37056615 PMCID: PMC10089077 DOI: 10.1039/d2na00893a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 02/22/2023] [Indexed: 06/19/2023]
Abstract
The hybrid vesicle AuNP@LCCV, in which a large number of AuNPs with an average size of about 2.8 nm were densely and uniformly distributed in an isolated state throughout the corona of the unusual polymer vesicle, was prepared via in situ reduction of Au3+ ions, which were encapsulated in advance in the unique polymer vesicle (LCCV) consisting of a hydrophobic membrane of poly(2-phenyl-2-oxazoline) and a hydrophilic loop-cluster corona of polyethyleneimine. The vesicle was formed via self-assembly from a comb-like block copolymer in which a polystyrenic main chain was grafted densely with diblock polyethyleneimine-b-poly(2-phenyl-2-oxazoline) and acted as a reactor for the reduction of Au3+. The hybrid vesicle AuNP@LCCV showed powerful catalytic ability in the reduction of nitrophenols (NPs). Interestingly, the reduction reactions of NPs showed a remarkably long induction time, which could be shortened dramatically from 60 min to 1-2 min by greatly increasing the concentration of NaBH4. It is revealed that the oxygen adsorbed on the AuNPs significantly inhibited the reduction, causing the induction time. Once the oxygen is chemically cleaned from the surface of the AuNPs, the reduction of 4-NP proceeds gradually for a while and then completes suddenly. The reduction mechanism accompanying the oxygen-dependent induction time is proposed from the view of the strong oxygen affinity of the catalyst AuNP@LCCV.
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Affiliation(s)
- Wen-Li Wang
- Department of Material and Life Chemistry, Kanagawa University 3-27-1 Rokkakubashi Yokohama 221-8686 Japan
| | - Ayaka Kanno
- Department of Material and Life Chemistry, Kanagawa University 3-27-1 Rokkakubashi Yokohama 221-8686 Japan
| | - Amika Ishiguri
- Department of Material and Life Chemistry, Kanagawa University 3-27-1 Rokkakubashi Yokohama 221-8686 Japan
| | - Ren-Hua Jin
- Department of Material and Life Chemistry, Kanagawa University 3-27-1 Rokkakubashi Yokohama 221-8686 Japan
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6
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Ma A, Yang W, Gao K, Tang J. Concave gold nano-arrows (AuCNAs) for efficient catalytic reduction of 4-nitrophenol. CHEMOSPHERE 2023; 310:136800. [PMID: 36244421 DOI: 10.1016/j.chemosphere.2022.136800] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/01/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
Anisotropic gold nanostructures have attracted great attention in different fields including catalysis. Thermodynamically driven selective surface growth offers a reliable and reproducible method for anisotropic gold nanoparticle synthesis with specific morphologies. Herein, monocrystalline concave gold nano-arrows (AuCNAs) are prepared by the over-growth method using Au nanorods (AuNRs) as seeds. The as-prepared AuCNAs consist of a biconical head and four concave structures. Interestingly, silver ions (Ag+) concentration significantly affects the product morphology by tuning the peak positions of surface plasmon resonance (SPR), aspect ratio, arrow, and concave morphology of AuCNAs. The position of longitudinal SPR peaks is observed at 810, 805 and 782 nm at [Ag+]/[Au3+] molar ratios of 1:2, 1:1, and 2:1, respectively. Diameters and lengths of AuCNAs varied from 25 nm to 36 nm; 104 nm, 78 nm, and 120 nm, respectively. Additionally, the AuCNAs are applied for the catalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in presence of excess NaBH4. Compared to gold nanorods (AuNRs), the prepared AuCNAs catalyst shows excellent catalytic activity, demonstrating that concave structures and sharp corners significantly enhance the catalytic activity. The value of pseudo-first-order reaction kinetic constants (kapp) increased from 0.0051 to 0.0195 s-1 with increasing catalyst valume from 7.5 to 37.5 μL. The highest normalized reaction rate constant (Knor) and turnover frequency (TOF) reach 5.84 × 104 min-1 mmol-1 and 443.47 h-1, respectively, at [Ag+]/[Au3+] ratio of 1:1 in AuCNAs catalyst. This study expands catalytic applications of anisotropic gold nanostructures and widens their potential application areas, such as surface plasmon exciton photonics, biomedical photonics, and photocatalysis.
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Affiliation(s)
- Ang Ma
- College of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, China
| | - Weiye Yang
- College of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, China
| | - Kunpeng Gao
- College of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, China
| | - Junqi Tang
- College of Physics and Electronic Information, Yunnan Normal University, Kunming, 650500, China.
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7
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Jiang J, Wei W, Tang Y, Yang S, Wang X, Xu Y, Ai L. In Situ Implantation of Bi 2S 3 Nanorods into Porous Quasi-Bi-MOF Architectures: Enabling Synergistic Dissociation of Borohydride for an Efficient and Fast Catalytic Reduction of 4-Nitrophenol. Inorg Chem 2022; 61:19847-19856. [PMID: 36453837 DOI: 10.1021/acs.inorgchem.2c03073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Catalytic hydrogenation reduction based on sodium borohydride (NaBH4) has gained attention as an appealing "one-stone-two-birds" approach for the simultaneous elimination of nitroaromatic pollutants and the production of high-value aminoaromatics under mild conditions. However, the slow kinetics of NaBH4 dissociation on the surface of catalysts restrict the catalytic hydrogenation reduction efficiency. Herein, we report an intelligent localized sulfidation strategy for an in situ implantation of Bi2S3 nanorods within quasi-Bi-MOF architectures (Bi2S3@quasi-Bi-MOF) by fine-tuning the pyrolysis temperature. In this novel Bi2S3@quasi-Bi-MOF, the porous quasi-Bi-MOF enables efficient adsorption of BH4- and 4-nitrophenol (4-NP), while Bi2S3 facilitates the BH4- dissociation to form Hads* species adsorbed on the catalyst surface. Benefiting from the synergistic structure, Bi2S3@quasi-Bi-MOF exhibits excellent performance 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 (knor) 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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Affiliation(s)
- Jing Jiang
- College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
| | - Wei Wei
- College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
| | - Ying Tang
- College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
| | - Shiyu Yang
- College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
| | - Xinzhi Wang
- College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
| | - Ying Xu
- College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
| | - Lunhong Ai
- College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
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8
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Electric field direction-induced gas/water selectively entering nanochannel. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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9
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Abdul Hakkeem HM, Babu A, Shilpa N, Venugopal AA, Mohamed AP, Kurungot S, Pillai S. Tailored synthesis of ultra-stable Au@Pd nanoflowers with enhanced catalytic properties using cellulose nanocrystals. Carbohydr Polym 2022; 292:119723. [PMID: 35725192 DOI: 10.1016/j.carbpol.2022.119723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 06/04/2022] [Accepted: 06/07/2022] [Indexed: 11/02/2022]
Abstract
A green strategy for the synthesis of bimetallic core-shell Au@Pd nanoflowers (NFs) employing banana pseudo-stem-derived TEMPO-oxidized cellulose nanocrystals (TCNC) as both capping and shape-directing agent via seed-mediated method is presented. Flower-like nanostructures of Au@Pd bound to TEMPO-oxidized cellulose nanocrystals (TCNC-Au@Pd) were decorated on amino-functionalized graphene (NH2-RGO) without losing their unique structure, allowing them to be deployed as an efficient, reusable and a green alternative heterogeneous catalyst. The decisive role of TCNC in the structural metamorphosis of nanoparticle morphology were inferred from the structural and morphology analyses. According to our study, the presence of -OH rich TCNC appears to play a pivotal role in the structured evolution of intricate nanostructure morphology. The feasibility of the bio-supported catalyst has been investigated in two concurrently prevalent model catalytic reactions, namely the oxygen reduction reaction (ORR) and the reduction of 4-nitrophenol, the best model reactions in fuel cell and industrial catalytic applications, respectively.
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Affiliation(s)
- Hasna M Abdul Hakkeem
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695 019, Kerala, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Aswathy Babu
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695 019, Kerala, India
| | - Nagaraju Shilpa
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Adithya A Venugopal
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695 019, Kerala, India
| | - A P Mohamed
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695 019, Kerala, India
| | - Sreekumar Kurungot
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India; Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Saju Pillai
- Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695 019, Kerala, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India.
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10
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Nickel on Oxidatively Modified Carbon as a Promising Cost-Efficient Catalyst for Reduction of P-Nitrophenol. Molecules 2022; 27:molecules27175637. [PMID: 36080402 PMCID: PMC9458120 DOI: 10.3390/molecules27175637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 08/24/2022] [Accepted: 08/28/2022] [Indexed: 11/16/2022] Open
Abstract
The reduction of p-nitrophenol to p-aminophenol has become a benchmark reaction for testing the efficiency of new catalytic systems. In this study, we use oxidatively modified carbon (OMC) as a structural support to develop a new cost-efficient nickel-based catalytic system. The newly developed material comprises single nickel ions, chemically bound to the oxygen functional groups on the OMC surface. The highly oxidized character of OMC ensures the high lateral density of nickel ions on its surface at relatively low nickel content. We demonstrate excellent catalytic properties of the new material by using it as a stationary phase in a prototype of a continuous flow reactor: the reagent fed into the reactor is p-nitrophenol, and the product, exiting the reactor, is the fully converted p-aminophenol. The catalytic properties of the new catalyst are associated with its specific morphology, and with high lateral density of active sites on the surface. The reaction can be considered as an example of single-atom catalysis. The resulting material can be used as an inexpensive but efficient catalyst for industrial wastewater treatment. The study opens the doors for the synthesis of a new series of catalytic systems comprising transition metal atoms on the OMC structural support.
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11
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Reddy Bogireddy NK, Mejia YR, Aminabhavi TM, Barba V, Becerra RH, Ariza Flores AD, Agarwal V. The identification of byproducts from the catalytic reduction reaction of 4-nitrophenol to 4-aminophenol: A systematic spectroscopic study. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 316:115292. [PMID: 35658257 DOI: 10.1016/j.jenvman.2022.115292] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 04/20/2022] [Accepted: 05/09/2022] [Indexed: 06/15/2023]
Abstract
Acetaminophenol, commonly recognized as paracetamol (considered safer than aspirin) is formed by nitration of phenol (4-nitrophenol (4-NP)) for its conversion to 4-aminophenol (4-AP), followed by the acetylation for the final product. As 4-NP is an intermediate product in acetaminophenol (paracetamol) production from phenol the dynamic analysis of acetylation of amine group is important. This study focuses on the feasibility of spectroscopic studies to monitor the removal of 4-NP using sodium borohydride (NaBH4) probe reaction in the presence of silver, gold, and bimetallic Ag/Au nanoparticles. UV-visible absorbance and fluorescence spectroscopy measurements reveal the formation of 1,4-benzoquinone (BQ), hydroquinone (HQ), and phenol (Ph) as the final products, in addition to the formation of typically reported 4-AP. The intermediates of NaBH4 seem to play a significant role in the formation of BQ, which converts to HQ in the basic medium followed by the formation of phenol in an acidic medium. Complete kinetic analysis with respect to spectroscopic studies of the standard compounds is presented. Similar results were obtained with 4-NP spiked river and seawater samples. The present findings may lead to catalytic benchmarking that can differ from most of the current practices and highlight the importance of adopting a holistic approach towards the fundamental understanding of 4-NP catalytic reduction that must take into account the concentration of NaBH4 and pH interdependencies.
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Affiliation(s)
| | - Yetzin Rodriguez Mejia
- Facultad de Química, Universidad Autónoma Del Estado de México, Paseo Colón esq, Paseo Tollocan s/n, Toluca, Estado de México, C.P., 50120, Mexico
| | - Tejraj M Aminabhavi
- School of Advanced Sciences, KLE Technological University, Hubballi, Karnataka, 580031, India; School of Engineering, University of Petroleum and Energy Studies, Dehradun, Mohali, 248 007, India
| | - Victor Barba
- Centro de Investigaciones Químicas-IICBA, Universidad Autónoma Del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos CP, 62209, Mexico
| | - Raul Herrera Becerra
- Instituto de Física, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, C.P., 04510, Mexico
| | - A David Ariza Flores
- CONACyT-Universidad Autónoma de San Luis Potosí, Karakorum 1470, Lomas 4ta Secc, San Luis Potosí, S.L.P., 78210, Mexico
| | - Vivechana Agarwal
- Centro de Investigación en Ingeniería y Ciencias Aplicadas, UAEM, Av. Univ. 1001, Col. Chamilpa, Cuernavaca, Morelos, 62209, Mexico.
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12
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Shultz LR, Preradovic K, Ghimire S, Hadley HM, Xie S, Kashyap V, Beazley MJ, Crawford KE, Liu F, Mukhopadhyay K, Jurca T. Nickel foam supported porous copper oxide catalysts with noble metal-like activity for aqueous phase reactions. Catal Sci Technol 2022; 12:3804-3816. [PMID: 35965882 PMCID: PMC9373473 DOI: 10.1039/d1cy02313f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
Contiguous metal foams offer a multitude of advantages over conventional powders as supports for nanostructured heterogeneous catalysts; most critically a preformed 3-D porous framework ensuring full directional coverage of supported catalyst, and intrinsic ease of handling and recyclability. Nonetheless, metal foams remain comparatively underused in thermal catalysis compared to more conventional supports such as amorphous carbon, metal oxides, zeolites and more recently MOFs. Herein, we demonstrate a facile preparation of highly-reactive, robust, and easy to handle Ni foam-supported Cu-based metal catalysts. The highly sustainable synthesis requires no specialized equipment, no surfactants or additive redox reagents, uses water as solvent, and CuCl2(H2O)2 as precursor. The resulting material seeds as well-separated micro-crystalline Cu2(OH)3Cl evenly covering the Ni foam. Calcination above 400 °C transforms the Cu2(OH)3Cl to highly porous CuO. All materials display promising activity towards the reduction of 4-nitrophenol and methyl orange. Notably, our leading CuO-based material displays 4-nitrophenol reduction activity comparable with very reactive precious-metal based systems. Recyclability studies highlight the intrinsic ease of handling for the Ni foam support, and our results point to a very robust, highly recyclable catalyst system.
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Affiliation(s)
- Lorianne R Shultz
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
| | - Konstantin Preradovic
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
| | - Suvash Ghimire
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida, 32816, USA
| | - Hayden M Hadley
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
| | - Shaohua Xie
- Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, Florida, 32816, USA
| | - Varchaswal Kashyap
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida, 32816, USA
| | - Melanie J Beazley
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
| | - Kaitlyn E Crawford
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida, 32816, USA
- NanoScience and Technology Center (NSTC), University of Central Florida, Orlando, Florida, 32826, USA
- Biionix Faculty Cluster, University of Central Florida, Orlando, Florida, 32816, USA
| | - Fudong Liu
- Department of Civil, Environmental, and Construction Engineering, University of Central Florida, Orlando, Florida, 32816, USA
- Biionix Faculty Cluster, University of Central Florida, Orlando, Florida, 32816, USA
- Renewable Energy and Chemical Transformation Faculty Cluster (REACT), University of Central Florida, Orlando, Florida, 32816, USA
| | - Kausik Mukhopadhyay
- Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida, 32816, USA
- Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, Florida, 32826, USA
| | - Titel Jurca
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA
- NanoScience and Technology Center (NSTC), University of Central Florida, Orlando, Florida, 32826, USA
- Renewable Energy and Chemical Transformation Faculty Cluster (REACT), University of Central Florida, Orlando, Florida, 32816, USA
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13
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Behera M, Tiwari N, Banerjee S, Sheik AR, Kumar M, Pal M, Pal P, Chatterjee RP, Chakrabortty S, Tripathy SK. Ag/biochar nanocomposites demonstrate remarkable catalytic activity towards reduction of p-nitrophenol via restricted agglomeration and leaching characteristics. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128616] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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14
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Wang W, Wang Z, Sun M, Zhang H, Wang H. Ligand-free sub-5 nm platinum nanocatalysts on polydopamine supports: size-controlled synthesis and size-dictated reaction pathway selection. NANOSCALE 2022; 14:5743-5750. [PMID: 35348174 DOI: 10.1039/d2nr00805j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Noble metal nanoparticles exhibit intriguing size-dependent catalytic activities toward a plethora of important chemical reactions. A particularly interesting but rarely explored scenario is that some catalytic molecule-transforming processes may even inter-switch among multiple reaction pathways when the dimensions of a metal nanocatalyst are deliberately tuned within specific size windows. Here, we take full advantage of the adhesive surface properties of polydopamine to kinetically maneuver the surface-mediated nucleation and growth of Pt nanocrystals, which enables us to synthesize polydopamine-supported sub-5 nm Pt nanocatalysts with precisely tunable particle sizes, narrow size distributions, ligand-free clean surfaces, and uniform dispersion over the supports. The success in precisely tuning the particle size of ligand-free Pt nanocatalysts within the sub-5 nm size window provides unique opportunities for us to gain detailed, quantitative insights concerning the intrinsic particle size effects on the pathway selection of catalytic molecular transformations. As exemplified by Pt-catalyzed nitrophenol reduction by ammonia borane, catalytic transfer hydrogenation reactions may inter-switch between two fundamentally distinct bimolecular reaction pathways, specifically the Langmuir-Hinshelwood and the Eley-Rideal mechanisms, as the size of the Pt nanocatalysts varies in the sub-5 nm regime.
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Affiliation(s)
- Wei Wang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
| | - Zixin Wang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
| | - Mengqi Sun
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
| | - Hui Zhang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
| | - Hui Wang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
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15
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da Silva RTP, Córdoba De Torresi SI, de Oliveira PFM. Mechanochemical Strategies for the Preparation of SiO2-Supported AgAu Nanoalloy Catalysts. Front Chem 2022; 10:836597. [PMID: 35186886 PMCID: PMC8847606 DOI: 10.3389/fchem.2022.836597] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/05/2022] [Indexed: 11/18/2022] Open
Abstract
Silver-gold nanoalloys were prepared from their metal salts precursors through bottom-up mechanochemical synthesis, using one-pot or galvanic replacement reaction strategies. The nanostructures were prepared over amorphous SiO2 as an inert supporting material, facilitating their stabilization without the use of any stabilizing agent. The nanomaterials were extensively characterized, confirming the formation of the bimetallic nanostructures. The nanoalloys were tested as catalysts in the hydrogenation of 2-nitroaniline and exhibited up to 4-fold the rate constant and up to 37% increased conversion compared to the respective single metal nanoparticles. Our approach is advantageous to produce nanoparticles with clean surfaces with available catalytic sites, directly in the solid-state and in an environmentally friendly manner.
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16
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Lomonosov V, Asselin J, Ringe E. Solvent effects on the kinetics of 4-nitrophenol reduction by NaBH 4 in the presence of Ag and Au nanoparticles. REACT CHEM ENG 2022; 7:1728-1741. [PMID: 35966409 PMCID: PMC9316932 DOI: 10.1039/d2re00044j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 04/22/2022] [Indexed: 11/21/2022]
Abstract
The reduction of 4-nitrophenol (4-NiP) to 4-aminophenol (4-AP) with an excess of sodium borohydride is commonly used as a model reaction to assess the catalytic activity of metallic nanoparticles. This reaction is considered both a potentially important step in industrial water treatment and an attractive, commercially relevant synthetic pathway. Surprisingly, an important factor, the role of the reaction medium on the reduction performance, has so far been overlooked. Here, we report a pronounced effect of the solvent on the reaction kinetics in the presence of silver and gold nanoparticles. We demonstrate that the addition of methanol, ethanol, or isopropanol to the reaction mixture leads to a dramatic decrease in the reaction rate. For typical concentrations of reactants, the reduction is completely suppressed in the presence of 50 vol% alcohols. 4-NiP reduction rate in aqueous alcohol mixtures can, however, be improved noticeably by increasing the borohydride concentration or the reaction temperature. The analysis of various factors responsible for solvent effects reveals that the decrease in the reduction rate in the presence of alcohols is related, amongst others, to a substantially higher oxygen solubility in alcohols compared to water. The results of this work show that the effects of solvent properties on reaction kinetics must be considered for unambiguous comparison and optimization of the catalytic performance of metallic nanoparticles in the liquid phase 4-NiP reduction. The presence of methanol, ethanol, or isopropanol in the reaction mixture substantially affects the kinetics of 4-nitrophenol reduction in aqueous medium.![]()
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Affiliation(s)
- Vladimir Lomonosov
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
| | - Jérémie Asselin
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
| | - Emilie Ringe
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK
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17
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Mollazehi F. Catalytic nanoparticles and magnetic nanocatalysts in organic reactions: A mini review. MAIN GROUP CHEMISTRY 2022. [DOI: 10.3233/mgc-210170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Nanocatalysts, as a part of nanotechnology, have been seen very useful for various fileds of applications capturing a large contribution of the world market. Indeed, several unsolved issues of catalysts have been reconsidered by employing the new nanocatalysts including single core metal atoms and ions with surrounding holes. Moreover, it was expected that the future of catalytic reactions, especially those organic ones, will deal with the nanocatalyst applications. To this aim, the features of catalytic nanoparticles and magnetic nanocatalysts regarding evaluation of their advantages and applications in organic reactions were investigated in this work. Developments of catalytic nanoparticles and magnetic nanocatalysts were discussed in this work regarding the novel applications of such materials at the nanoscale for approaching advantageous features. Increased availability, activity, and stability are very important for applications of the catalysts in various organic reactions. Therefore, it is a must to discuss features of such nanocatalytic systems to provide more information about their advantages and even disadvantages of their applications.
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Affiliation(s)
- Fouziyeh Mollazehi
- Department of Chemistry, Faculty of Science, Saravan Branch, Islamic Azad University, Saravan, Iran
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18
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Mejía YR, Reddy Bogireddy NK. Reduction of 4-nitrophenol using green-fabricated metal nanoparticles. RSC Adv 2022; 12:18661-18675. [PMID: 35873318 PMCID: PMC9228544 DOI: 10.1039/d2ra02663e] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Accepted: 05/30/2022] [Indexed: 01/19/2023] Open
Abstract
Noble metal (silver (Ag), gold (Au), platinum (Pt), and palladium (Pd)) nanoparticles have gained increasing attention due to their importance in several research fields such as environmental and medical research. This review focuses on the basic perceptions of the green synthesis of metal nanoparticles and their supported-catalyst-based reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The mechanisms for the formation of these nanoparticles and the catalytic reduction of 4-NP are discussed. Furthermore, the parameters that need to be considered in the catalytic efficiency calculations and perspectives for future studies are also discussed. Noble metal (silver (Ag), gold (Au), platinum (Pt), and palladium (Pd)) nanoparticles have gained increasing attention due to their importance in several research fields such as environmental and medical research.![]()
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Affiliation(s)
- Yetzin Rodriguez Mejía
- Facultad de Química, Universidad Autónoma del estado de México, Paseo Colón esq. Paseo Tollocan s/n, Toluca, Estado de México, C.P. 50120, Mexico
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19
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Raza W, Ahmad K, Kim H. Fabrication of defective graphene oxide for efficient hydrogen production and enhanced 4-nitro-phenol reduction. NANOTECHNOLOGY 2021; 32:495404. [PMID: 34399410 DOI: 10.1088/1361-6528/ac1dd4] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Accepted: 08/16/2021] [Indexed: 06/13/2023]
Abstract
Hydrogen has been considered as one of the most promising alternative energy source to solve the future energy demands due to its high energy capacity and emission-free character. The generation of hydrogen from non-fossil sources is necessary for the sustainable development of human life on this planet. The hydrolysis of sodium borohydride can quickly produce a large amount of hydrogenin situand on-demand in the presence of the catalyst, which can be used as an alternative energy source. So, it is crucial to fabricate the highly efficient, robust, and economical catalyst for the production of hydrogen via hydrolysis of sodium borohydride. Herein, a facile and efficient approach for the synthesis of metal-functionalized reduced graphene oxide for the production of hydrogen at room temperature was used. Moreover, the synthesized catalyst has also been tested in the field of environmental catalysis for the reduction of toxic 4-nitrophenol to valuable 4-aminophenol in the presence of sodium borohydride. The enhanced activity of prepared metal-functionalized reduced graphene oxide is ascribed to a strong affinity between Fe-NXand reduced graphene oxide which facilitates electron transfer as well as synergistic effect. Overall, this work presents a crucial procedure for green chemistry reactions when a carbonaceous material is selected as a catalyst.
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Affiliation(s)
- Waseem Raza
- Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Khursheed Ahmad
- School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea
| | - Haekyoung Kim
- School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, Republic of Korea
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20
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M. Abdul Hakkeem H, Babu A, Kumar Pal S, Peer Mohamed A, Kumar Ghosh S, Pillai S. Cellulose nanocrystals directed in-situ assembly of Au@Ag nanostructures with multifunctional activities. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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21
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Analysis of the Reduction of 4-Nitrophenol Catalyzed by Para-Mercaptobenzoic Acid Capped Magic Number Gold Clusters. Catal Letters 2021. [DOI: 10.1007/s10562-021-03727-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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22
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Forsythe RC, Cox CP, Wilsey MK, Müller AM. Pulsed Laser in Liquids Made Nanomaterials for Catalysis. Chem Rev 2021; 121:7568-7637. [PMID: 34077177 DOI: 10.1021/acs.chemrev.0c01069] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Catalysis is essential to modern life and has a huge economic impact. The development of new catalysts critically depends on synthetic methods that enable the preparation of tailored nanomaterials. Pulsed laser in liquids synthesis can produce uniform, multicomponent, nonequilibrium nanomaterials with independently and precisely controlled properties, such as size, composition, morphology, defect density, and atomistic structure within the nanoparticle and at its surface. We cover the fundamentals, unique advantages, challenges, and experimental solutions of this powerful technique and review the state-of-the-art of laser-made electrocatalysts for water oxidation, oxygen reduction, hydrogen evolution, nitrogen reduction, carbon dioxide reduction, and organic oxidations, followed by laser-made nanomaterials for light-driven catalytic processes and heterogeneous catalysis of thermochemical processes. We also highlight laser-synthesized nanomaterials for which proposed catalytic applications exist. This review provides a practical guide to how the catalysis community can capitalize on pulsed laser in liquids synthesis to advance catalyst development, by leveraging the synergies of two fields of intensive research.
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Affiliation(s)
- Ryland C Forsythe
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States
| | - Connor P Cox
- Materials Science Program, University of Rochester, Rochester, New York 14627, United States
| | - Madeleine K Wilsey
- Materials Science Program, University of Rochester, Rochester, New York 14627, United States
| | - Astrid M Müller
- Department of Chemical Engineering, University of Rochester, Rochester, New York 14627, United States.,Materials Science Program, University of Rochester, Rochester, New York 14627, United States.,Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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23
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Mravljak R, Bizjak O, Božič B, Podlogar M, Podgornik A. Flow-Through PolyHIPE Silver-Based Catalytic Reactor. Polymers (Basel) 2021; 13:880. [PMID: 33809358 PMCID: PMC8000888 DOI: 10.3390/polym13060880] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 03/05/2021] [Accepted: 03/08/2021] [Indexed: 11/16/2022] Open
Abstract
Catalytic reactors performing continuously are an important step towards more efficient and controllable processes compared to the batch operation mode. For this purpose, homogenous high internal phase emulsion polymer materials with an immobilized silver catalyst were prepared and used as a continuous plug flow reactor. Porous material with epoxide groups was functionalized to bear aldehyde groups which were used to reduce silver ions using Tollens reagent. Investigation of various parameters revealed that the mass of deposited silver depends on the aldehyde concentration as well as the composition of Tollens reagent. Nanoparticles formed on the pore surface showed high crystallinity with a cuboctahedra crystal shape and highly uniform surface coverage. The example of the 4-nitrophenol catalytic reduction in a continuous process was studied and demonstrated to be dependent on the mass of deposited silver. Furthermore, productivity increased with the volumetric silver density and flow rate, and it was preserved during prolonged usage and storage.
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Affiliation(s)
- Rok Mravljak
- Department of Chemical Engineering and Technical Safety, Faculty for Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia; (R.M.); (O.B.); (B.B.); (M.P.)
| | - Ožbej Bizjak
- Department of Chemical Engineering and Technical Safety, Faculty for Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia; (R.M.); (O.B.); (B.B.); (M.P.)
| | - Benjamin Božič
- Department of Chemical Engineering and Technical Safety, Faculty for Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia; (R.M.); (O.B.); (B.B.); (M.P.)
| | - Matejka Podlogar
- Department of Chemical Engineering and Technical Safety, Faculty for Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia; (R.M.); (O.B.); (B.B.); (M.P.)
- Department for Nanostructured Materials, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia
| | - Aleš Podgornik
- Department of Chemical Engineering and Technical Safety, Faculty for Chemistry and Chemical Technology, University of Ljubljana, SI-1000 Ljubljana, Slovenia; (R.M.); (O.B.); (B.B.); (M.P.)
- COBIK, Tovarniška 26, 5270 Ajdovščina, Slovenia
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24
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Ultralow Loading Ruthenium on Alumina Monoliths for Facile, Highly Recyclable Reduction of p-Nitrophenol. Catalysts 2021. [DOI: 10.3390/catal11020165] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The pervasive use of toxic nitroaromatics in industrial processes and their prevalence in industrial effluent has motivated the development of remediation strategies, among which is their catalytic reduction to the less toxic and synthetically useful aniline derivatives. While this area of research has a rich history with innumerable examples of active catalysts, the majority of systems rely on expensive precious metals and are submicron- or even a few-nanometer-sized colloidal particles. Such systems provide invaluable academic insight but are unsuitable for practical application. Herein, we report the fabrication of catalysts based on ultralow loading of the semiprecious metal ruthenium on 2–4 mm diameter spherical alumina monoliths. Ruthenium loading is achieved by atomic layer deposition (ALD) and catalytic activity is benchmarked using the ubiquitous para-nitrophenol, NaBH4 aqueous reduction protocol. Recyclability testing points to a very robust catalyst system with intrinsic ease of handling.
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25
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Xie Z, Li Z, Li J, Kou J, Yao J, Fan J. Electric field-induced gas dissolving in aqueous solutions. J Chem Phys 2021; 154:024705. [PMID: 33445907 DOI: 10.1063/5.0037387] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Gas dissolution or accumulation regulating in an aqueous environment is important but difficult in various fields. Here, we performed all-atom molecular dynamics simulations to study the dissolution/accumulation of gas molecules in aqueous solutions. It was found that the distribution of gas molecules at the solid-water interface is regulated by the direction of the external electric field. Gas molecules attach and accumulate to the interface with an electric field parallel to the interface, while the gas molecules depart and dissolve into the aqueous solutions with a vertical electric field. The above phenomena can be attributed to the redistribution of water molecules as a result of the change of hydrogen bonds of water molecules at the interface as affected by the electric field. This finding reveals a new mechanism of regulating gas accumulation and dissolution in aqueous solutions and can have tremendous applications in the synthesis of drugs, the design of microfluidic device, and the extraction of natural gas.
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Affiliation(s)
- Zhang Xie
- Institute of Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004, China
| | - Zheng Li
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
| | - Jingyuan Li
- Department of Physics, Zhejiang University, Hangzhou 310058, China
| | - Jianlong Kou
- Institute of Condensed Matter Physics, Zhejiang Normal University, Jinhua 321004, China
| | - Jun Yao
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
| | - Jintu Fan
- Department of Fiber Science and Apparel Design, Cornell University, Ithaca, New York 14853-4401, USA
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26
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Saren RK, Banerjee S, Mondal B, Senapati S, Tripathy T. Studies of simultaneous electrochemical sensing of Hg 2+ and Cd 2+ ions and catalytic reduction properties of 4-nitrophenol by CuO, Au, and CuO@Au composite nanoparticles synthesised using a graft copolymer as a bio-template. NEW J CHEM 2021. [DOI: 10.1039/d1nj04702g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Simultaneous electrochemical detection of Hg2+ and Cd2+ ions and catalytic reduction of 4NP to 4AP using a novel synthesized graft copolymer/CuO@Au NPs composite.
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Affiliation(s)
- Rakesh Kumar Saren
- Postgraduate Division of Chemistry, Midnapore College (Autonomous), Paschim Medinipur, Midnapore 721101, West Bengal, India
| | - Shankha Banerjee
- Department of Biotechnology, BJM School of Bioscience, Indian Institute of Technology Madras, Chennai 600036, India
| | - Barun Mondal
- Postgraduate Division of Chemistry, Midnapore College (Autonomous), Paschim Medinipur, Midnapore 721101, West Bengal, India
| | - Sanjib Senapati
- Department of Biotechnology, BJM School of Bioscience, Indian Institute of Technology Madras, Chennai 600036, India
| | - Tridib Tripathy
- Postgraduate Division of Chemistry, Midnapore College (Autonomous), Paschim Medinipur, Midnapore 721101, West Bengal, India
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27
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Li J, Li Q, Steinberg CEW, Zhao Q, Pan B, Pignatello JJ, Xing B. Reaction of Substituted Phenols with Lignin Char: Dual Oxidative and Reductive Pathways Depending on Substituents and Conditions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:15811-15820. [PMID: 33241687 DOI: 10.1021/acs.est.0c04991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Biomass chars are known to be intrinsically redox-reactive toward some organic compounds, but the mechanisms are still unclear. To address this, a char made anoxically at 500 °C from dealkaline lignin was reacted either in the fresh state or after 180-day aging in air with p-nitrophenol (NO2-P), p-hydroxybenzaldehyde (CHO-P), phenol (H-P), or p-methoxyphenol (MeO-P). The reactions were carried out under oxic or anoxic conditions. Degradation occurred in all cases. Both oxidation and reduction products were identified, with yields dependent on the presence or absence of air during reaction or storage. They included oligomers, amines, and ring-hydroxylated compounds, among others. Exposure to air suppressed sorption, annihilated reducing sites, and provided a source of reactive oxygen species that assisted degradation. Sorption suppression was due to the incorporation of hydrophilic groups by chemisorption of oxygen, and possibly blockage of sites by products. Fresh char has comparable electron-donating and accepting capacity, whereas there is a preponderance of electron-accepting over donating capacity in aged char. Under anoxic conditions, both oxidation and reduction occurred. Under oxic conditions or after aging in air, oxidation predominated, and linear free energy relationships were found between the rate constant and the Hammett or Brown substituent electronic parameter or the standard electrode potential of the phenol. The results demonstrate that chars possess heterogeneous redox activities depending on reaction pairs, reaction conditions, and aging.
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Affiliation(s)
- Jing Li
- Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500 Yunnan, China
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Qingqing Li
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Christian E W Steinberg
- Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500 Yunnan, China
- Faculty of Life Sciences, Laboratory of Freshwater & Stress Ecology, Humboldt-Universität zu Berlin, Arboretum, Späthstr. 80/81, 12437 Berlin, Germany
| | - Qing Zhao
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Bo Pan
- Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming, 650500 Yunnan, China
| | - Joseph J Pignatello
- Department of Environmental Sciences, The Connecticut Agricultural Experiment Station, New Haven, Connecticut 06504, United States
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, Massachusetts 01003, United States
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28
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Sharma B, Rajput P, Rana RK. Influencing the Electron Density of Nanosized Au Colloids via Immobilization on MgO to Stimulate Surface Reaction Activities. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:14203-14213. [PMID: 33206535 DOI: 10.1021/acs.langmuir.0c02238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Heterogenization of colloidal gold on MgO is demonstrated to facilitate its catalytic surface reactivity. We show that the electron density on Au influenced by its immobilization on MgO along with the ensued metal-support interaction is one of the key parameters to obtain high activity. As elucidated by X-ray absorption spectroscopic (X-ray photoelectron spectroscopy, X-ray absorption near-edge structure, and extended X-ray absorption fine structure) studies, the presence of well-dispersed nanosized Au on MgO is observed to result in an enhancement in the electron density of Au. The consequence of this electron-rich gold on the catalytic activity is then investigated using the nitroarene reduction as a model reaction with a detailed kinetic study. The kinetic study is an attempt to use a true heterogeneous system rather than the usually studied quasi-homogeneous systems. The results obtained reveal that the Au/MgO catalyst has a surface rate constant of ∼1.39 × 10-3 mol m-2 s-1, which is significantly higher than those of the reported catalysts. While it validates the higher catalytic activity with a TOF of 9456 h-1 observed for Au/MgO, the increased adsorption constant for 4-nitrophenol on Au/MgO further reflects the efficacy of MgO as the support. This not only allows effective heterogenization of the Au nanoparticles keeping the catalyst stable under the reaction conditions and being reused several times but also renders a capability in reduction of other nitro group-containing substrates. Therefore, the results are believed to be of importance in designing heterogeneous catalysts utilizing the distinctive properties of the nanosized colloids and tuning their surface reactivity as well.
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Affiliation(s)
- Bikash Sharma
- Nanomaterials Laboratory, Department of Catalysis & Fine Chemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Parasmani Rajput
- Atomic & Molecular Physics Division, Bhabha Atomic Research Center, Mumbai 400085, India
| | - Rohit Kumar Rana
- Nanomaterials Laboratory, Department of Catalysis & Fine Chemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Verma A, Shukla M, Kumar S, Pal S, Sinha I. Mechanism of visible light enhanced catalysis over curcumin functionalized Ag nanocatalysts. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 240:118534. [PMID: 32534428 DOI: 10.1016/j.saa.2020.118534] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/19/2020] [Accepted: 05/23/2020] [Indexed: 06/11/2023]
Abstract
There is little research on the visible light photocatalytic properties of the hybrids of plasmonic metals and organic molecules (OM) with the HOMO-LUMO gap in the visible range. Here, we investigate the mechanism of the visible light enhanced reduction of p-nitrophenol (PNP) by glycerol (a green reductant) at ambient temperature over curcumin functionalized Ag nanoparticles (c-AgNPs). The catalytic activity got significantly boosted under visible light irradiation. Reaction kinetics indicated that the catalytic mechanism followed under visible light and in the dark were different. DFT calculations showed that in the ground state, the HOMO resides on Ag while the LUMO is on the curcumin part of the composite. TD-DFT calculations demonstrated the transfer of charge from Ag to curcumin on photo-excitation. Based on this information, we propose a mechanism for understanding the role of curcumin in this photocatalytic phenomenon.
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Affiliation(s)
- Alkadevi Verma
- Department of Chemistry, Rewa Engineering College, Rewa 486002, India
| | - Madhulata Shukla
- G.B. College, Veer Kunwar Singh University, Ramgarh, Kaimur, Arrah, India
| | - Sunil Kumar
- Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India
| | - Shaili Pal
- Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India
| | - Indrajit Sinha
- Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi 221005, India.
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30
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You J, Jin D, Tseng W, Tseng W, Lin P. Gold(I)‐Thiolate Oligomers for Catalytic Hydrogenation of Nitroaromatics in Aqueous and Organic Medium. ChemCatChem 2020. [DOI: 10.1002/cctc.202000885] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jyun‐Guo You
- Department of Chemistry National Sun Yat-sen University No.70 Lien-hai Rd. Kaohsiung 80424 Taiwan
| | - Dun‐Yuan Jin
- Department of Chemistry National Sun Yat-sen University No.70 Lien-hai Rd. Kaohsiung 80424 Taiwan
| | - Wei‐Bin Tseng
- Department of Chemistry National Sun Yat-sen University No.70 Lien-hai Rd. Kaohsiung 80424 Taiwan
| | - Wei‐Lung Tseng
- Department of Chemistry National Sun Yat-sen University No.70 Lien-hai Rd. Kaohsiung 80424 Taiwan
- School of Pharmacy Kaohsiung Medical University No. 100, Shiquan 1st Road Sanmin District Kaohsiung 80708 Taiwan
| | - Po‐Chiao Lin
- Department of Chemistry National Sun Yat-sen University No.70 Lien-hai Rd. Kaohsiung 80424 Taiwan
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31
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Neal RD, Hughes RA, Sapkota P, Ptasinska S, Neretina S. Effect of Nanoparticle Ligands on 4-Nitrophenol Reduction: Reaction Rate, Induction Time, and Ligand Desorption. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02759] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Robert D. Neal
- College of Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Robert A. Hughes
- College of Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Pitambar Sapkota
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, Unites States
- Notre Dame Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Sylwia Ptasinska
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, Unites States
- Notre Dame Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Svetlana Neretina
- College of Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Department of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, Unites States
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32
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Varshney S, Bar‐Ziv R, Zidki T. On the Remarkable Performance of Silver‐based Alloy Nanoparticles in 4‐Nitrophenol Catalytic Reduction. ChemCatChem 2020. [DOI: 10.1002/cctc.202000584] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shalaka Varshney
- Department of Chemical Sciences, and the Center for Radical Reactions Ariel University Kyriat Hamada 3 Ariel 40700 Israel
| | - Ronen Bar‐Ziv
- Department of Chemistry Nuclear Research Center Negev Beer-Sheva 84190 Israel
| | - Tomer Zidki
- Department of Chemical Sciences, and the Center for Radical Reactions Ariel University Kyriat Hamada 3 Ariel 40700 Israel
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33
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Shultz LR, Hu L, Feng X, Jurca T. Using a Nitrophenol Cocktail Screen to Improve Catalyst Down-selection. Chemphyschem 2020; 21:1627-1631. [PMID: 32529796 DOI: 10.1002/cphc.202000400] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/09/2020] [Indexed: 11/05/2022]
Abstract
The catalytic reduction of 4-nitrophenol (4NP) with excess NaBH4 is the benchmark model for quantifying catalytic activity of nanoparticles. Although broadly useful, the reaction can be very selective. This can lead to false positives and negatives when utilized for catalyst down-selection from a broader materials candidate pool. We report a multi-nitrophenol cocktail screening methodology incorporating 4NP and other amino-nitrophenols, utilizing Ag, Au, Pt, and Pd nanoparticles on carbon support. The reduction of the cocktail proceeds with no deleterious side reactions on the time-scale tested. The resulting kinetic rates provide an improved correlation of relative catalyst activity when compared to performance with other reducible moieties (e. g. azo bonds), or when compared to solely 4NP screening.
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Affiliation(s)
- Lorianne R Shultz
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA.,Renewable Energy and Chemical Transformations Cluster, University of Central Florida, Orlando, Florida, 32816, USA
| | - Lin Hu
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, Orlando, Florida, 32816, USA.,Department of Materials Science and Engineering, University of Central Florida, Orlando, Florida, 32816, USA
| | - Xiaofeng Feng
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, Orlando, Florida, 32816, USA.,Department of Physics, University of Central Florida, Orlando, Florida, 32816, USA
| | - Titel Jurca
- Department of Chemistry, University of Central Florida, Orlando, Florida, 32816, USA.,Renewable Energy and Chemical Transformations Cluster, University of Central Florida, Orlando, Florida, 32816, USA.,NanoScience Technology Center, University of Central Florida, Orlando, Florida, 32826, USA
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34
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Kinetic Analysis of 4-Nitrophenol Reduction by "Water-Soluble" Palladium Nanoparticles. NANOMATERIALS 2020; 10:nano10061169. [PMID: 32549394 PMCID: PMC7353196 DOI: 10.3390/nano10061169] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/10/2020] [Accepted: 06/12/2020] [Indexed: 11/21/2022]
Abstract
The most important model catalytic reaction to test the catalytic activity of metal nanoparticles is the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride as it can be precisely monitored by UV–vis spectroscopy with high accuracy. This work presents the catalytic reduction of 4-nitrophenol (4-Nip) to 4-aminophenol (4-Amp) in the presence of Pd nanoparticles and sodium borohydride as reductants in water. We first evaluate the kinetics using classical pseudo first-order kinetics. We report the effects of different initial 4-Nip and NaBH4 concentrations, reaction temperatures, and mass of Pd nanoparticles used for catalytic reduction. The thermodynamic parameters (activation energy, enthalpy, and entropy) were also determined. Results show that the kinetics are highly dependent on the reactant ratio and that pseudo first-order simplification is not always fit to describe the kinetics of the reaction. Assuming that all steps of this reaction proceed only on the surface of Pd nanoparticles, we applied a Langmuir−Hinshelwood model to describe the kinetics of the reaction. Experimental data of the decay rate of 4-nitrophenol were successfully fitted to the theoretical values obtained from the Langmuir–Hinshelwood model and all thermodynamic parameters, the true rate constant k, as well as the adsorption constants of 4-Nip, and BH4− (K4-Nip and KBH4−) were determined for each temperature.
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Strachan J, Barnett C, Masters AF, Maschmeyer T. 4-Nitrophenol Reduction: Probing the Putative Mechanism of the Model Reaction. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00725] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jyah Strachan
- Laboratory for Advanced Catalysis for Sustainability, The University of Sydney, Sydney, 2006, NSW Australia
| | - Christopher Barnett
- Laboratory for Advanced Catalysis for Sustainability, The University of Sydney, Sydney, 2006, NSW Australia
| | - Anthony F. Masters
- Laboratory for Advanced Catalysis for Sustainability, The University of Sydney, Sydney, 2006, NSW Australia
| | - Thomas Maschmeyer
- Laboratory for Advanced Catalysis for Sustainability, The University of Sydney, Sydney, 2006, NSW Australia
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36
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Highly Active Hydrogenation Catalysts Based on Pd Nanoparticles Dispersed along Hierarchical Porous Silica Covered with Polydopamine as Interfacial Glue. Catalysts 2020. [DOI: 10.3390/catal10040449] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
New catalysts based on Pd(0) nanoparticles (Pd NPs) on a bimodal porous silica of the UVM-7/polydopamine (PDA) support have been synthesized following two preparative strategies based on the sequential or joint incorporation of two components of the composite (Pd and PDA). We analyzed the role played by the PDA as ‘interfacial glue’ between the silica scaffold and the Pd NPs. The catalysts were tested for the hydrogenation of 4-nitrophenol using (NEt4)BH4 as the hydrogenating agent. In addition to the palladium content, the characterization of the catalysts at the micro and nanoscale has highlighted the importance of different parameters, such as the size and dispersion of the Pd NPs, as well as their accessibility to the substrate (greater or lesser depending on their entrapment level in the PDA) on the catalytic efficiency. Staged sequential synthesis has led to better catalytic results. The most active Pd(0) centers seem to be Pd NPs of less than 1 nm on the PDA surface. The efficiency of the catalysts obtained is superior to that of similar materials without PDA. A comprehensive comparison has been made with other catalysts based on Pd NPs in a wide variety of supports. The TOF values achieved are among the best described in the literature.
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37
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Manivannan S, An S, Jeong J, Viji M, Kim K. Hematite/M (M = Au, Pd) Catalysts Derived from a Double-Hollow Prussian Blue Microstructure: Simultaneous Catalytic Reduction of o- and p-Nitrophenols. ACS APPLIED MATERIALS & INTERFACES 2020; 12:17557-17570. [PMID: 32207290 DOI: 10.1021/acsami.0c01704] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Present study deals with hematite/M (M = Au, Pd) catalysts converted from a double-hollow Prussian blue microstructure (DHPM). The unique Prussian blue (PB) microstructure (MS) is prepared by a template-free solvothermal synthetic route in a single-step reaction. An amine-functionalized silicate sol-gel matrix (SSG) has served as the structure-directing agent cum stabilizer for making DHPM. Synthesized DHPM is having a unique structure: a hollow core and an in situ etched porous surface. Growth mechanism is explored and revealed by analyzing several experimental parameters such as HCl concentration, Fe source, effect of the added EtOH, silane concentration, and role of silanes' amine groups. It is identified that the superstructure consisted of well-aligned PB cubes growing radially from the core of the superstructure. Metal (Au and Pd) nanoparticles (NPs) are deposited on both interior and exterior of the PB MS through galvanic displacement reaction, and thus metal NP-loaded hematite phase iron oxide (α-Fe2O3) nanomaterials were derived by annealing them in air. Catalytic activities of the hematite/M(M = Au, Pd) MS are investigated toward simultaneous catalytic reduction of o-nitrophenol and p-nitrophenol. The resultant hematite/Pd MS showed high structural stability and catalytic active sites than the hematite/Au MS, which enhances the catalytic properties for the simultaneous catalytic reduction of both nitrophenols.
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Affiliation(s)
- Shanmugam Manivannan
- Electrochemistry Laboratory for Sensors & Energy (ELSE), Department of Chemistry, Incheon National University, Incheon 22012, Republic of Korea
| | - Seonghwi An
- Electrochemistry Laboratory for Sensors & Energy (ELSE), Department of Chemistry, Incheon National University, Incheon 22012, Republic of Korea
| | - Juwon Jeong
- Electrochemistry Laboratory for Sensors & Energy (ELSE), Department of Chemistry, Incheon National University, Incheon 22012, Republic of Korea
| | - Mayavan Viji
- College of Pharmacy and Medicinal Research Center (MRC), Chungbuk National University, Cheongju 28160, Republic of Korea
| | - Kyuwon Kim
- Electrochemistry Laboratory for Sensors & Energy (ELSE), Department of Chemistry, Incheon National University, Incheon 22012, Republic of Korea
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38
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Nariya P, Das M, Shukla F, Thakore S. Synthesis of magnetic silver cyclodextrin nanocomposite as catalyst for reduction of nitro aromatics and organic dyes. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112279] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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39
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Yahagi T, Togashi T, Kurihara M. An exclusive deposition method of silver nanoparticles on TiO 2 particles via low-temperature decomposition of silver-alkyldiamine complexes in aqueous media. RSC Adv 2020; 10:4545-4553. [PMID: 35495263 PMCID: PMC9049126 DOI: 10.1039/c9ra10307d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 01/17/2020] [Indexed: 11/21/2022] Open
Abstract
The low-temperature decomposition of Ag(i)–dmpda complexes catalytically occurs on TiO2 surfaces in water.
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Affiliation(s)
- Tomohiro Yahagi
- Faculty of Science
- Yamagata University
- Japan
- Technical Support Center
- National Institute of Technology
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40
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Neelam, Meyerstein D, Adhikary J, Burg A, Shamir D, Albo Y. Zero-valent iron nanoparticles entrapped in SiO2 sol-gel matrices: A catalyst for the reduction of several pollutants. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2019.105819] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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41
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Karuppusamy S, Marken F, Kulandainathan MA. Role of dissolved oxygen in nitroarene reduction by a heterogeneous silver textile catalyst in water. NEW J CHEM 2020. [DOI: 10.1039/d0nj03713c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of dissolved oxygen concentration on the rate constant of the 4-nitrophenol reduction reaction with a silver-coated textile as a ‘dip-catalyst’ were studied.
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Affiliation(s)
- Sembanadar Karuppusamy
- Academy of Scientific and Innovative Research (AcSIR)
- Ghaziabad 201002
- India
- CSIR-Central Electrochemical Research Institute
- Karaikudi 630003
| | - Frank Marken
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
| | - Manickam Anbu Kulandainathan
- Academy of Scientific and Innovative Research (AcSIR)
- Ghaziabad 201002
- India
- CSIR-Central Electrochemical Research Institute
- Karaikudi 630003
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42
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Shultz LR, McCullough B, Newsome WJ, Ali H, Shaw TE, Davis KO, Uribe-Romo FJ, Baudelet M, Jurca T. A Combined Mechanochemical and Calcination Route to Mixed Cobalt Oxides for the Selective Catalytic Reduction of Nitrophenols. Molecules 2019; 25:E89. [PMID: 31881734 PMCID: PMC6982874 DOI: 10.3390/molecules25010089] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 12/14/2019] [Accepted: 12/15/2019] [Indexed: 12/28/2022] Open
Abstract
Para-, or 4-nitrophenol, and related nitroaromatics are broadly used compounds in industrial processes and as a result are among the most common anthropogenic pollutants in aqueous industrial effluent; this requires development of practical remediation strategies. Their catalytic reduction to the less toxic and synthetically desirable aminophenols is one strategy. However, to date, the majority of work focuses on catalysts based on precisely tailored, and often noble metal-based nanoparticles. The cost of such systems hampers practical, larger scale application. We report a facile route to bulk cobalt oxide-based materials, via a combined mechanochemical and calcination approach. Vibratory ball milling of CoCl2(H2O)6 with KOH, and subsequent calcination afforded three cobalt oxide-based materials with different combinations of CoO(OH), Co(OH)2, and Co3O4 with different crystallite domains/sizes and surface areas; Co@100, Co@350 and Co@600 (Co@###; # = calcination temp). All three prove active for the catalytic reduction of 4-nitrophenol and related aminonitrophenols. In the case of 4-nitrophenol, Co@350 proved to be the most active catalyst, therein its retention of activity over prolonged exposure to air, moisture, and reducing environments, and applicability in flow processes is demonstrated.
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Affiliation(s)
- Lorianne R. Shultz
- Department of Chemistry, University of Central Florida, 4111 Libra Drive, Orlando, FL 32816, USA; (L.R.S.); (B.M.); (W.J.N.); (T.E.S.)
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA
| | - Bryan McCullough
- Department of Chemistry, University of Central Florida, 4111 Libra Drive, Orlando, FL 32816, USA; (L.R.S.); (B.M.); (W.J.N.); (T.E.S.)
- National Center for Forensic Science, University of Central Florida, 12354 Research Parkway #225, Orlando, FL 32826, USA
| | - Wesley J. Newsome
- Department of Chemistry, University of Central Florida, 4111 Libra Drive, Orlando, FL 32816, USA; (L.R.S.); (B.M.); (W.J.N.); (T.E.S.)
| | - Haider Ali
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (K.O.D.)
| | - Thomas E. Shaw
- Department of Chemistry, University of Central Florida, 4111 Libra Drive, Orlando, FL 32816, USA; (L.R.S.); (B.M.); (W.J.N.); (T.E.S.)
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA
| | - Kristopher O. Davis
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA; (H.A.); (K.O.D.)
- CREOL—The College of Optics & Photonics, Building 53, University of Central Florida, 4304 Scorpius Street, Orlando, FL 32816, USA
| | - Fernando J. Uribe-Romo
- Department of Chemistry, University of Central Florida, 4111 Libra Drive, Orlando, FL 32816, USA; (L.R.S.); (B.M.); (W.J.N.); (T.E.S.)
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA
| | - Matthieu Baudelet
- Department of Chemistry, University of Central Florida, 4111 Libra Drive, Orlando, FL 32816, USA; (L.R.S.); (B.M.); (W.J.N.); (T.E.S.)
- National Center for Forensic Science, University of Central Florida, 12354 Research Parkway #225, Orlando, FL 32826, USA
- CREOL—The College of Optics & Photonics, Building 53, University of Central Florida, 4304 Scorpius Street, Orlando, FL 32816, USA
| | - Titel Jurca
- Department of Chemistry, University of Central Florida, 4111 Libra Drive, Orlando, FL 32816, USA; (L.R.S.); (B.M.); (W.J.N.); (T.E.S.)
- Renewable Energy and Chemical Transformations Cluster, University of Central Florida, 4353 Scorpius Street, Orlando, FL 32816, USA
- NanoScience Technology Center, University of Central Florida, Orlando, FL 32826, USA
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43
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Larm NE, Thon JA, Vazmitsel Y, Atwood JL, Baker GA. Borohydride stabilized gold-silver bimetallic nanocatalysts for highly efficient 4-nitrophenol reduction. NANOSCALE ADVANCES 2019; 1:4665-4668. [PMID: 36133135 PMCID: PMC9418733 DOI: 10.1039/c9na00645a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2019] [Accepted: 10/17/2019] [Indexed: 06/16/2023]
Abstract
Bimetallic Au x Ag1-x nanoparticles, prepared using sodium borohydride as the sole reducing and capping agent for various NaBH4 : metal molar ratios, were investigated as catalysts for 4-nitrophenol reduction. This approach yielded the highest catalytic activities observed for this model reaction to date.
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Affiliation(s)
- Nathaniel E Larm
- Department of Chemistry, University of Missouri Columbia MO 65211 USA
| | - Jason A Thon
- Department of Chemistry, University of Missouri Columbia MO 65211 USA
| | - Yahor Vazmitsel
- Department of Chemistry, University of Missouri Columbia MO 65211 USA
| | - Jerry L Atwood
- Department of Chemistry, University of Missouri Columbia MO 65211 USA
| | - Gary A Baker
- Department of Chemistry, University of Missouri Columbia MO 65211 USA
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44
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Wang YX, Ma S, Huang MN, Yang H, Xu ZL, Xu Z. Ag NPs coated PVDF@TiO2 nanofiber membrane prepared by epitaxial growth on TiO2 inter-layer for 4-NP reduction application. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.115700] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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45
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García-Dalí S, Paredes JI, Munuera JM, Villar-Rodil S, Adawy A, Martínez-Alonso A, Tascón JMD. Aqueous Cathodic Exfoliation Strategy toward Solution-Processable and Phase-Preserved MoS 2 Nanosheets for Energy Storage and Catalytic Applications. ACS APPLIED MATERIALS & INTERFACES 2019; 11:36991-37003. [PMID: 31516002 DOI: 10.1021/acsami.9b13484] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The production of MoS2 nanosheets by electrochemical exfoliation routes holds great promise as a means to access this two-dimensional material in large quantities for different practical applications. However, the use of electrolytes based on synthetic organic salts and solvents, as well as issues related to the unwanted oxidation and/or phase transformation of the exfoliated nanosheets, constitute significant obstacles that hinder the industrial adoption of the electrochemical approach. Here, we introduce a safe and sustainable method for the cathodic delamination of MoS2 that makes use of aqueous solutions of very simple and widely available salts, mainly KCl, as the electrolyte. Combined with an appropriate biomolecule-based solvent transfer protocol, such an electrolytic exfoliation route is shown to afford colloidally dispersed, oxide-free, and phase-preserved MoS2 nanosheets of high structural quality in considerable yields. The mechanisms behind the efficient aqueous delamination of the bulk MoS2 cathode are also discussed and rationalized on the basis of the penetration of hydrated cations from the electrolyte between its layers and the immediate reduction of the accompanying water molecules. An asymmetric supercapacitor assembled with a cathodic MoS2 nanosheet-single walled carbon nanotube hybrid as the positive electrode and activated carbon as the negative electrode delivered energy densities (e.g., 26 W h kg-1 at 750 W kg-1 in 6 M KOH) that were competitive with those of other MoS2-based asymmetric devices. When used as a catalyst for the reduction of nitroarenes, the present cathodically exfoliated nanosheets exhibited one of the highest activities reported so far with MoS2 nanostructures, the origin of which is accounted for as well. Overall, by facilitating access to this two-dimensional material through a particularly simple, efficient, and cost-effective technique, these results should expedite the practical implementation of MoS2 nanosheets in energy storage, catalysis, and beyond.
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Affiliation(s)
- Sergio García-Dalí
- Instituto Nacional del Carbón, INCAR-CSIC , C/Francisco Pintado Fe 26 , 33011 Oviedo , Spain
| | - Juan I Paredes
- Instituto Nacional del Carbón, INCAR-CSIC , C/Francisco Pintado Fe 26 , 33011 Oviedo , Spain
| | - José M Munuera
- Instituto Nacional del Carbón, INCAR-CSIC , C/Francisco Pintado Fe 26 , 33011 Oviedo , Spain
| | - Silvia Villar-Rodil
- Instituto Nacional del Carbón, INCAR-CSIC , C/Francisco Pintado Fe 26 , 33011 Oviedo , Spain
| | - Alaa Adawy
- Laboratory of High-Resolution Transmission Electron Microscopy, Scientific and Technical Services , University of Oviedo-CINN , 33006 Oviedo , Spain
| | - Amelia Martínez-Alonso
- Instituto Nacional del Carbón, INCAR-CSIC , C/Francisco Pintado Fe 26 , 33011 Oviedo , Spain
| | - Juan M D Tascón
- Instituto Nacional del Carbón, INCAR-CSIC , C/Francisco Pintado Fe 26 , 33011 Oviedo , Spain
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46
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Ponprapakaran K, Hariharasubramani R, Baskaran R, Tung KL, Anbarasan R. Synthesis, characterization, and application of fluorescent electrically conducting copolymer/metal-oxide nanocomposites. POLYM-PLAST TECH MAT 2019. [DOI: 10.1080/25740881.2018.1563132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- K. Ponprapakaran
- Department of Polymer Technology, Kamaraj College of Engineering and Technology, Virudhunagar, India
| | - R. Hariharasubramani
- Department of Polymer Technology, Kamaraj College of Engineering and Technology, Virudhunagar, India
| | - R. Baskaran
- Department of Polymer Technology, Kamaraj College of Engineering and Technology, Virudhunagar, India
| | - Kuo-Lun Tung
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - R. Anbarasan
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
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Begum R, Farooqi ZH, Aboo AH, Ahmed E, Sharif A, Xiao J. Reduction of nitroarenes catalyzed by microgel-stabilized silver nanoparticles. JOURNAL OF HAZARDOUS MATERIALS 2019; 377:399-408. [PMID: 31176075 DOI: 10.1016/j.jhazmat.2019.05.080] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 03/18/2019] [Accepted: 05/26/2019] [Indexed: 06/09/2023]
Abstract
Poly(N-isopropylacrylamide-co-acrylamide) (PNA-BIS-2) microgels were synthesized by free radical precipitation polymerization in aqueous medium. Spherical Ag nanoparticles with diameter of 10-20 nm were fabricated inside the PNA-BIS-2 microgels by in-situ reduction of silver nitrate using sodium borohydride as reducing agent. The Ag nanoparticles- loaded hybrid microgels were characterized by Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Energy dispersive X-ray (EDX), Scanning transmission electron microscopy (STEM), Ultraviolet visible spectroscopy (UV Visible), Thermogravimetric analysis (TGA) and X-ray diffraction (XRD). Ag contents in the hybrid system were determined by inductively coupled plasma - optical emission spectrometry (ICP-OES). Various nitroarenes were successfully converted into their respective aromatic amines with good to excellent yields (ranging from 75% to 97%) under mild reaction conditions. The catalyst has ability to successfully convert substituted nitroarenes into desired products keeping many functionalities intact. The catalyst can be stored for long time without any sign of aggregation and can be used multiple times without any significant loss in its catalytic activity.
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Affiliation(s)
- Robina Begum
- Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK; Institute of Chemistry, University of the Punjab, New Campus Lahore, 54590, Pakistan; Centre for Undergraduate Studies, University of the Punjab, New Campus Lahore, 54590, Pakistan
| | - Zahoor H Farooqi
- Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK; Institute of Chemistry, University of the Punjab, New Campus Lahore, 54590, Pakistan.
| | - Ahmed H Aboo
- Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK
| | - Ejaz Ahmed
- Institute of Chemistry, University of the Punjab, New Campus Lahore, 54590, Pakistan
| | - Ahsan Sharif
- Institute of Chemistry, University of the Punjab, New Campus Lahore, 54590, Pakistan
| | - Jianliang Xiao
- Department of Chemistry, University of Liverpool, Liverpool, L69 7ZD, UK.
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Rodríguez Molina H, Santos Muñoz JL, Domínguez Leal MI, Reina TR, Ivanova S, Centeno Gallego MÁ, Odriozola JA. Carbon Supported Gold Nanoparticles for the Catalytic Reduction of 4-Nitrophenol. Front Chem 2019; 7:548. [PMID: 31475132 PMCID: PMC6706980 DOI: 10.3389/fchem.2019.00548] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 07/19/2019] [Indexed: 12/03/2022] Open
Abstract
This work is a detailed study on how to optimize gold colloids preparation and their deposition to very different in nature carbon materials. The change of the continuous phase and its dielectric constant is used to assure the good dispersion of the hydrophilic/hydrophobic carbons and the successful transfer of the preformed small size colloids to their surface. The sintering behavior of the particles during the calcination step is also studied and the optimal conditions to reduce to a minimum the particle size increase during the protecting agent removal phase are found. The as prepared catalysts have been tested in a relevant reaction in the field of environmental catalysis such as the reduction of 4-nitrophenol leading to promising results. Overall, this work proposes an important methodology to follow when a carbonaceous material are selected as catalyst supports for green chemistry reactions.
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Affiliation(s)
- Hugo Rodríguez Molina
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Sevilla, Seville, Spain
| | - José Luis Santos Muñoz
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Sevilla, Seville, Spain
| | | | - Tomas Ramírez Reina
- Department of Chemical and Process Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, United Kingdom
| | - Svetlana Ivanova
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Sevilla, Seville, Spain
| | | | - José Antonio Odriozola
- Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Sevilla, Seville, Spain
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Jeya Ranchani AA, Parthasarathy V, Hu C, Lin YF, Tung KL, Anbarasan R. Structural modification of aminoclay for catalytic applications. CHEM ENG COMMUN 2019. [DOI: 10.1080/00986445.2019.1630394] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- A. Amala Jeya Ranchani
- Department of Physics, Hindustan Institute of Technology and Science, Padur, Chennai, Tamil Nadu, India
| | - V. Parthasarathy
- Department of Physics, Hindustan Institute of Technology and Science, Padur, Chennai, Tamil Nadu, India
| | - Chechia Hu
- Department of Chemical Engineering, Luh Hwa Research Centre for Circular Economy and R&D Centre for Membrane Technology, Chung Yuan Christian University, Taipei, Taiwan
| | - Yi-Feng Lin
- Department of Chemical Engineering, Luh Hwa Research Centre for Circular Economy and R&D Centre for Membrane Technology, Chung Yuan Christian University, Taipei, Taiwan
| | - Kuo-Lun Tung
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - R. Anbarasan
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
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50
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Ibrahim I, Athanasekou C, Manolis G, Kaltzoglou A, Nasikas NK, Katsaros F, Devlin E, Kontos AG, Falaras P. Photocatalysis as an advanced reduction process (ARP): The reduction of 4-nitrophenol using titania nanotubes-ferrite nanocomposites. JOURNAL OF HAZARDOUS MATERIALS 2019; 372:37-44. [PMID: 30606617 DOI: 10.1016/j.jhazmat.2018.12.090] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 12/06/2018] [Accepted: 12/22/2018] [Indexed: 05/27/2023]
Abstract
TiO2 photocatalysis is an advanced process, employed worldwide for the oxidation of organic compounds, that leads to significant technological applications in the fields of health and environment. The use of the photocatalytic approach in reduction reactions seems very promising and can open new horizons for green chemistry synthesis. For this purpose, titanium dioxide nanotubes (TNTs) were developed in autoclave conditions using TiO2 P25 as a precursor material. Based on these nanotubular substrates, TiO2/CoFe2O4 (TCF) nanocomposites were further obtained by wet impregnation method. The materials were thoroughly characterized and their structural, textural, vibrational, optoelectronic and magnetic properties were determined. The composite materials combine absorbance in the visible optical range and high BET surface area values (˜100 m2/g), showing extremely high yield in the photocatalytic reduction of 4-nitrophenol (4-NP), exceeding 94% within short illumination time (only 35 min). The developed nanocomposites were successfully reused in consecutive photocatalytic experiments and were easily removed from the reaction medium using magnets. Both remarkable recycling ability and high-performance stability in the photocatalytic reduction of nitrophenol were observed, thus justifying the significant economic potential and industrial perspectives for this advanced reduction process.
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Affiliation(s)
- Islam Ibrahim
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece; Department of Chemistry, National and Kapodistrian University of Athens, Zografou 157 84, Greece
| | - Chrysoula Athanasekou
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Georgios Manolis
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Andreas Kaltzoglou
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Nektarios K Nasikas
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Fotios Katsaros
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Eamonn Devlin
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Athanassios G Kontos
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece
| | - Polycarpos Falaras
- Institute of Nanoscience and Nanotechnology, NCSR "Demokritos", 15341 Agia Paraskevi, Athens, Greece.
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