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Heterogeneous asymmetric β-C-H functionalization of aldehydes under O2 catalyzed by hydroxide-layered Fe(III) sites synergistic with confined interlayer amine. J Catal 2022. [DOI: 10.1016/j.jcat.2022.09.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Yan M, Huang Y, He H, Xie Y, Li Y. Efficient removal of arsenic (III) from aqueous solutions by new layered hydroxides (Ca–Fe–Cl LDHs). J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2020.1724799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Mengmeng Yan
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
| | - Yongbing Huang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
| | - Hongchang He
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
| | - Yiting Xie
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
| | - Yao Li
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
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Szabados M, Adél Ádám A, Traj P, Muráth S, Baán K, Bélteky P, Kónya Z, Kukovecz Á, Sipos P, Pálinkó I. Mechanochemical and wet chemical syntheses of CaIn-layered double hydroxide and its performance in a transesterification reaction compared to those of other Ca2M(III) hydrocalumites (M: Al, Sc, V, Cr, Fe, Ga) and Mg(II)-, Ni(II)-, Co(II)- or Zn(II)-based hydrotalcites. J Catal 2020. [DOI: 10.1016/j.jcat.2020.07.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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On the Reconstruction Peculiarities of Sol–Gel Derived Mg2−xMx/Al1 (M = Ca, Sr, Ba) Layered Double Hydroxides. CRYSTALS 2020. [DOI: 10.3390/cryst10060470] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this study, the reconstruction peculiarities of sol–gel derived Mg2−xMx/Al1 (M = Ca, Sr, Ba) layered double hydroxides were investigated. The mixed metal oxides (MMO) were synthesized by two different routes. Firstly, the MMO were obtained directly by heating Mg(M)–Al–O precursor gels at 650 °C, 800 °C, and 950 °C. These MMO were reconstructed to the Mg2−xMx/Al1 (M = Ca, Sr, Ba) layered double hydroxides (LDHs) in water at 50 °C for 6 h (pH 10). Secondly, in this study, the MMO were also obtained by heating reconstructed LDHs at the same temperatures. The synthesized materials were characterized using X-ray powder diffraction (XRD) analysis and scanning electron microscopy (SEM). Nitrogen adsorption by the Brunauer, Emmett, and Teller (BET) and Barrett, Joyner, and Halenda (BJH) methods were used to determine the surface area and pore diameter of differently synthesized alkaline earth metal substituted MMO compounds. It was demonstrated for the first time that the microstructure of reconstructed MMO from sol–gel derived LDHs showed a “memory effect”.
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Structural reconstruction of mechanochemically disordered CaFe-layered double hydroxide. APPLIED CLAY SCIENCE 2019. [DOI: 10.1016/j.clay.2019.03.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Szabados M, Ádám AA, Kónya Z, Kukovecz Á, Carlson S, Sipos P, Pálinkó I. Effects of ultrasonic irradiation on the synthesis, crystallization, thermal and dissolution behaviour of chloride-intercalated, co-precipitated CaFe-layered double hydroxide. ULTRASONICS SONOCHEMISTRY 2019; 55:165-173. [PMID: 30853533 DOI: 10.1016/j.ultsonch.2019.02.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Revised: 01/26/2019] [Accepted: 02/25/2019] [Indexed: 02/08/2023]
Abstract
The output power (30-150 W) and the periodicity (20-100%) of ultrasound emission were varied in a wide range to regulate and improve the crystallization process in the commonly used co-precipitation technique of chloride-intercalated CaFe-layered double hydroxides. The influence of ultrasound irradiation on the as-prepared materials was studied by X-ray diffractometry, dynamic light scattering, UV-Vis-NIR diffuse reflectance spectroscopy, specific surface area measurement, pore size analysis, ion-selective electrode potentiometric investigations and thermogravimetry. Additionally, structural alterations due to heat treatment at various temperatures were followed in detail by Fourier-transform infrared and X-ray absorption spectroscopies as well as scanning electron microscopy. The ultrasonic treatment was capable of controlling the sizes of primarily formed (from 19 nm to 30 nm) as well as the aggregated (secondary) particles (between 450 nm and 700 nm), and thus modifying their textural parameters and enhancing the incorporation of chloride anions into the interlamellar space. For the first time, the optical energy gap of CaFe-LDH was reported here depending on the nature of applied stirring (4.18-4.34 eV). The heat-treatment investigations revealed that the layered structure was stabile until 200 °C, even at the atomic level.
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Affiliation(s)
- Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Adél Anna Ádám
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary; MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich B tér 1, Szeged H-6720, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary
| | - Stefan Carlson
- MAX-IV Laboratory, Ole Römers väg 1, Lund SE-223 63, Sweden
| | - Pál Sipos
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary; Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged H-6720, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary.
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Sipos P, Pálinkó I. As-prepared and intercalated layered double hydroxides of the hydrocalumite type as efficient catalysts in various reactions. Catal Today 2018. [DOI: 10.1016/j.cattod.2016.12.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Szabados M, Varga G, Kónya Z, Kukovecz Á, Carlson S, Sipos P, Pálinkó I. Ultrasonically-enhanced preparation, characterization of CaFe-layered double hydroxides with various interlayer halide, azide and oxo anions (CO 32-, NO 3-, ClO 4-). ULTRASONICS SONOCHEMISTRY 2017; 40:853-860. [PMID: 28946496 DOI: 10.1016/j.ultsonch.2017.08.041] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 08/24/2017] [Accepted: 08/24/2017] [Indexed: 11/29/2022]
Abstract
An ultrasonically-enhanced mechanochemical method was developed to synthesize CaFe-layered double hydroxides (LDHs) with various interlayer anions (CO32-, NO3-, ClO4-, N3-, F-, Cl-, Br- and I-). The duration of pre-milling and ultrasonic irradiation and the variation of synthesis temperature in the wet chemical step were investigated to obtain the optimal parameters of preparation. The main method to characterize the products was X-ray diffractometry, but infrared and synchrotron-based X-ray absorption spectroscopies as well as thermogravimetric measurements were also used to learn about fine structural details. The synthesis method afforded successful intercalation of the anions, among others the azide anion, a rarely used counter ion providing a system, which enables safe handling the otherwise highly reactive anion. The X-ray absorption spectroscopic measurements revealed that the quality of the interlayered anions could modulate the spatial arrangement of the calcium ions around the iron(III) ions, but only in the second coordination sphere.
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Affiliation(s)
- Márton Szabados
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Gábor Varga
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary; MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich B tér 1, Szeged H-6720, Hungary
| | - Ákos Kukovecz
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1, Szeged H-6720, Hungary
| | - Stefan Carlson
- MAX IV Laboratory, University of Lund, Ole Römers väg 1, Lund SE-223 63, Sweden
| | - Pál Sipos
- Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary; Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged H-6720, Hungary
| | - István Pálinkó
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged H-6720, Hungary; Material and Solution Structure Research Group, Institute of Chemistry, University of Szeged, Aradi Vértanúk tere 1, Szeged H-6720, Hungary.
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