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Wu L, Wu Q, Han Y, Zhang D, Zhang R, Song N, Wu X, Zeng J, Yuan P, Chen J, Du A, Huang K, Yao X. Strengthening the Synergy between Oxygen Vacancies in Electrocatalysts for Efficient Glycerol Electrooxidation. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2401857. [PMID: 38594018 DOI: 10.1002/adma.202401857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 03/24/2024] [Indexed: 04/11/2024]
Abstract
Defect-engineered bimetallic oxides exhibit high potential for the electrolysis of small organic molecules. However, the ambiguity in the relationship between the defect density and electrocatalytic performance makes it challenging to control the final products of multi-step multi-electron reactions in such electrocatalytic systems. In this study, controllable kinetics reduction is used to maximize the oxygen vacancy density of a Cu─Co oxide nanosheet (CuCo2O4 NS), which is used to catalyze the glycerol electrooxidation reaction (GOR). The CuCo2O4-x NS with the highest oxygen-vacancy density (CuCo2O4-x-2) oxidizes C3 molecules to C1 molecules with selectivity of almost 100% and a Faradaic efficiency of ≈99%, showing the best oxidation performance among all the modified catalysts. Systems with multiple oxygen vacancies in close proximity to each other synergistically facilitate the cleavage of C─C bonds. Density functional theory calculations confirm the ability of closely spaced oxygen vacancies to facilitate charge transfer between the catalyst and several key glycolic-acid (GCA) intermediates of the GOR process, thereby facilitating the decomposition of C2 intermediates to C1 molecules. This study reveals qualitatively in tuning the density of oxygen vacancies for altering the reaction pathway of GOR by the synergistic effects of spatial proximity of high-density oxygen vacancies.
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Affiliation(s)
- Liyun Wu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Qilong Wu
- Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Yun Han
- School of Engineering and Built Environment, Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan Campus, Queensland, 4111, Australia
| | - Dongdong Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Rongrong Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Nan Song
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xiaofeng Wu
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, P. R. China
| | - Jianrong Zeng
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, P. R. China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P. R. China
| | - Pei Yuan
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350002, P. R. China
| | - Jun Chen
- Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science, Australian Institute for Innovative Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Aijun Du
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Gardens Point Campus, Brisbane, 4001, Australia
| | - KeKe Huang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xiangdong Yao
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
- School of Advanced Energy and IGCME, Sun Yat-Sen University (Shenzhen), Shenzhen, Guangdong, 518107, P. R. China
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Palladium Nanoparticles Incorporated Fumed Silica as an Efficient Catalyst for Nitroarenes Reduction via Thermal and Microwave Heating. Catalysts 2023. [DOI: 10.3390/catal13020445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
The reduction of nitroarenes to arylamines is a synthetically important transformation both in the laboratory and in industry. Herein, Palladium (Pd) nanoparticles were synthesized via incorporation with mesoporous fumed silica material by doping technique. Water was used as a solvent and the as-synthetized material was reduced by using NaBH4 to ensure the total transformation of PdO into Pd nanoparticles. The synthesized sample was characterized by using inductively coupled plasma (ICP) elemental analysis, X-ray powder diffraction (XRD), N2 sorption measurement, scanning electron microscope (SEM), energy-dispersive spectroscopy (EDX), and transmission electron microscopy (TEM). Data showed that the Pd nanoparticles were successfully synthesized and supported on the mesoporous silica with an average size in the ranges of 10–20 nm, with an irregular shape. The purity of the synthesized sample was confirmed by EDX analysis which exhibits the presence of Si, O, and Pd. The catalytic activity of the prepared sample was evaluated in the heterogeneous reduction of nitroarenes to aromatic amines. Reduction reaction was monitored by Shimadzu GC-17A gas chromatography (GC, Japan) equipped with flam ionization detector and RTX-5 column, 30 m × 0.25 mm, 1-μm film thickness. Helium was used as carrier gas at flow rate 0.6 mL/min. Interestingly, the green hydrogenation of nitroarenes to primary amine compounds was achieved in an aqueous solution with high efficiency and in a short time; moreover, the reusability of heterogeneous Pd-SiO2 was performed for four repeated cycles with more than 88% of efficiency at the fourth run. Finally, the heterogeneity of catalysis with high reliability and eco-friendly processes is a super new trend of nitroarenes reduction in the industry and economic scales.
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Agarwal S, Dowara B, Kumar S, Kumar V, Deori K. Magnetically Separable Visible Light-Active Ag 0.75Ni 0.25 Binary Alloy Nanoparticles as a Highly Efficient Photocatalyst for the Selective Oxidative Coupling of Aniline to Azobenzene. ACS OMEGA 2022; 7:48615-48622. [PMID: 36591159 PMCID: PMC9798513 DOI: 10.1021/acsomega.2c07441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Aniline wastes can be converted to useful pharmaceutical and industrial compounds like azobenzene. For this purpose, a bimetallic Ag0.75Ni0.25 alloy is designed in the nanoscale range resembling a fivefold twinned morphology using water as the solvent. These newly developed alloy nanoparticles (NPs) are employed for the first time as an efficient visible light-active photocatalyst for the oxidative homocoupling of aniline to azobenzene. Our catalytic protocol is highly sustainable for a large number of aniline substrates with a high yield of the product (up to 95%), which might be attributed to the combinational and superior properties achieved on alloy formation in comparison to the monometallic counterparts. High-electron density amines (p-anisidine) display greater photocatalytic proficiency than that of low-electron density amines (4-fluoroaniline). The developed photocatalyst is magnetically well-separable and can be reused for at least five catalytic cycles without appreciable loss in its activity.
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Affiliation(s)
- Soniya Agarwal
- Department
of Chemistry, Dibrugarh University, Dibrugarh786004, Assam, India
| | - Bidisa Dowara
- Department
of Chemistry, Dibrugarh University, Dibrugarh786004, Assam, India
| | - Sanjeev Kumar
- Department
of Chemistry, University of Delhi, Delhi110007, India
| | - Vinod Kumar
- Department
of Chemistry, University of Delhi, Delhi110007, India
- Special
Centre for Nano Sciences, Jawaharlal Nehru
University, Delhi110067, India
| | - Kalyanjyoti Deori
- Department
of Chemistry, Dibrugarh University, Dibrugarh786004, Assam, India
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Naime J, Mamun MSA, Aly Saad Aly M, Maniruzzaman M, Badal MMR, Karim KMR. Synthesis, characterization and application of a novel polyazo dye as a universal acid-base indicator. RSC Adv 2022; 12:28034-28042. [PMID: 36320250 PMCID: PMC9527568 DOI: 10.1039/d2ra04930a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Accepted: 09/19/2022] [Indexed: 06/16/2023] Open
Abstract
A novel organic polyazo dye is synthesized by the diazotization of aromatic aniline, followed by coupling it with sulfanilic acid and N,N-dimethylaniline. Characterization was done by 1H-NMR, 13C-NMR, and FTIR spectroscopy. Differential scanning calorimetry (DSC) reveals that phase transition for this molecule is exothermic. The optical band gap is estimated from the absorption cutoff point using UV-Visible spectroscopy. Thermal gravimetric analysis (TGA) addresses the thermal stability of the molecule and is found to be at ∼250 °C. The structure of the synthesized molecule is analogous to that of methyl orange and contains three azo groups. These three azo groups help accept more than two protons and provide two pK a values when diprotic acid or a mixture of acids is used in different titrations. Specifically, when a polybasic acid is in strong base titration, the pK a values were found to be 3.5 and 9.1. Moreover, for strong base and (strong + weak) acid mixture titration, the pK a values are found to be 9.2 and 3.3. Furthermore, the pK a values are found to be 8.6 and 2.8 for (strong and weak) base mixture and (strong and weak) acid mixture titration, respectively. Owing to its increased proton accepting capacity, it can be found in the two pH ranges of 2.1-3.8 for orange color and 8.2-9.8 for yellow color, thus indicating a unique property as a universal indicator for acid-base titration. The dissociation constant of this dye is found to be 3.4 × 10-6, determined in a mixed aqueous solution of 10 wt% ethanol, and a linear relationship between pK a and pH is observed in this solvent system.
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Affiliation(s)
- Jannatul Naime
- Chemistry Discipline, School of Science, Engineering and Technology, Khulna University Khulna-9208 Bangladesh
| | - Muhammad Shamim Al Mamun
- Chemistry Discipline, School of Science, Engineering and Technology, Khulna University Khulna-9208 Bangladesh
| | - Mohamed Aly Saad Aly
- Department of Electrical and Computer Engineering at Georgia Tech Shenzhen Institute (GTSI), Tianjin University Shenzhen Guangdong 518052 China
| | - Md Maniruzzaman
- Department of Chemistry, Khulna University of Engineering and Technology Khulna-9203 Bangladesh
| | - Md Mizanur Rahman Badal
- Department of Chemistry, Khulna University of Engineering and Technology Khulna-9203 Bangladesh
| | - Kaykobad Md Rezaul Karim
- Chemistry Discipline, School of Science, Engineering and Technology, Khulna University Khulna-9208 Bangladesh
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Xie K, Han R, Sun P, Wang H, Fang Y, Zhai Z, Ma D, Liu H. Rice husk biochar modified-CuCo 2O 4 as an efficient peroxymonosulfate activator for non-radical degradation of organic pollutants from aqueous environment. RSC Adv 2021; 11:39467-39475. [PMID: 35492460 PMCID: PMC9044812 DOI: 10.1039/d1ra06914d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Accepted: 12/06/2021] [Indexed: 12/16/2022] Open
Abstract
A series of rice husk biochar (RHBC) modified bimetallic oxides were prepared using a simple pyrolysis method to activate peroxymonosulfate (PMS) for the degradation of acid orange G (OG). The results demonstrated that 50 mg L−1 OG was completely decomposed by 1 mM PMS activated with 100 mg L−1 RHBC–CuCo2O4 within 15 min at initial pH 3.4. The OG degradation rate constant k of RHBC–CuCo2O4/PMS (0.95 × 10−1 min−1) was five times greater than that of CuCo2O4/PMS (0.19 × 10−1 min−1), suggesting that the introduction of RHBC significantly improved the activity of bimetallic oxides. The effects of the initial pH, catalyst dosage, PMS concentration and reaction temperature on OG removal were also studied. The degradation products of OG were analysed using a gas chromatography-mass spectrometer (GC-MS). Electron paramagnetic resonance (EPR) and quenching experiments showed that singlet oxygen (1O2) was the main active species. The RHBC–CuCo2O4/PMS oxidation system is not only unaffected by inorganic anions (Cl−, NO3−, HCO3−) and humic acid (HA), but also could remove other typical pollutants of acetaminophen (ACT), sulfathiazole (STZ), rhodamine B (RhB), and bisphenol A (BPA). These findings show that RHBC–CuCo2O4 has great potential for practical applications in the removal of typical organic pollutants. A series of rice husk biochar (RHBC) modified bimetallic oxides were prepared using a simple pyrolysis method to activate peroxymonosulfate (PMS) for the degradation of acid orange G (OG).![]()
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Affiliation(s)
- Kai Xie
- College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang PR China .,College of Petroleum Engineering, Liaoning Petrochemical University Fushun 113001 Liaoning PR China
| | - Ruirui Han
- College of Advanced Materials and Engineering, Jiaxing Nanhu University Jiaxing 314001 Zhejiang PR China
| | - Ping Sun
- College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang PR China
| | - Hui Wang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang PR China
| | - Yingsen Fang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang PR China
| | - Zhicai Zhai
- College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang PR China
| | - Danzhu Ma
- College of Petroleum Engineering, Liaoning Petrochemical University Fushun 113001 Liaoning PR China
| | - Hui Liu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang PR China
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