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New Applications of Layered Double Hydroxide-Based Materials
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New Applications of Layered Double Hydroxide-Based Materials

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 8142

Special Issue Editors

Dr. Adriana Urda

E-Mail Website
Guest Editor
Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 4-12 Blvd. Regina Elisabeta, Sector 3, 030018 Bucharest, Romania
Interests: layered double hydroxide catalysts; catalytic combustion of hydrocarbons; selective oxidation of hydrocarbons; hydrodeoxygenation of oxygenates
Dr. Gheorghita Mitran

E-Mail Website
Guest Editor
Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 4-12 Blvd. Regina Elisabeta, sector 3, 030018 Bucharest, Romania
Interests: layered double hydroxide catalysts; selective oxidation of hydrocarbons and oxygenates; steam reforming over mixed oxides derived from LDHs; kinetic studies for esterification reactions; dehydogenation

Special Issue Information

Dear Colleagues,

Layered double hydroxides (LDHs), known also as hydrotalcite-like compounds, are two-dimensional anionic clays with a unique structure due to the uniform distribution of metal cations in the brucite layers and a good ability to intercalate different anions in the interlayer space. They are promising materials with various applications in chemistry and chemical engineering (e.g., catalysts, catalytic supports, adsorbents), biochemistry, medicine (due to their antimicrobial activity) and pharmaceutics (for drug delivery). Functionalized layered double hydroxides are also investigated in the environmental chemistry for organic contaminants’ degradation; in the energy field for hydrogen generation, oxygen evolution, and for enhancing photoelectrochemical water splitting. As they are easy to synthesize, have interesting acid-base and redox properties, and possess good thermal and chemical stability, LDH-based materials offer numerous advantages for applications in all domains of chemistry and materials science.

The aim of this Special Issue is to update recent developments regarding layered double hydroxides preparation, characterization, and uses in various fields, especially new applications and new strategies to improve the properties of LDH-based materials.

Dr. Adriana Urda
Dr. Gheorghita Mitran
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • layered double hydroxide
  • LDH-derived catalysts
  • LDH acid-base properties
  • LDH redox properties
  • memory effect
  • environmental catalysis
  • biomass valorization
  • selective oxidation

Published Papers (4 papers)

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Research

18 pages, 3833 KiB  
Article
Development of New Efficient Adsorbent by Functionalization of Mg3Al-LDH with Methyl Trialkyl Ammonium Chloride Ionic Liquid
by Samuel Nick Țolea, Laura Cocheci, Lavinia Lupa, Raluca Vodă and Rodica Pode
Molecules 2021, 26(23), 7384; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26237384 - 05 Dec 2021
Cited by 4 | Viewed by 1476
Abstract
The present paper describes a new way of obtaining an efficient adsorbent material by functionalization of Mg3Al layered double hydroxides (LDH) with methyl trialkyl ammonium chloride-ionic liquid (IL) using two methods: ultrasound and cosynthesis. Layered double hydroxides are good solid support [...] Read more.
The present paper describes a new way of obtaining an efficient adsorbent material by functionalization of Mg3Al layered double hydroxides (LDH) with methyl trialkyl ammonium chloride-ionic liquid (IL) using two methods: ultrasound and cosynthesis. Layered double hydroxides are good solid support for the functionalization with ionic liquids due to their well-ordered structure. The immobilization of the ILs in suitable solid supports combine the advantages of the ILs with the properties of the solid supports bringing more benefits such as use of lower quantity of ILs and avoiding of ILs loss in the aqua phase which overall decrease the treatment costs. In case of ultrasound method of functionalization is assured a uniform distribution of IL on the solid surface, but through immobilization by cosynthesis due to the tunable properties of LDH, is assured an intercalation of the ILs between the LDH layers. This fact was highlighted by the X-ray diffraction (RXD), scanning electron microscopy (SEM) analyses and Fourier-transform infrared (FTIR) spectroscopy of the obtained adsorbent. The added value brought by the functionalization of Mg3Al with the studied IL was underlined by the adsorption studies conducted in the treatment process of water with diclofenac content. Kinetic, thermodynamic, and equilibrium studies were performed. DCF adsorption onto the studied materials correspond to a chemisorption, the pseudo-second-order kinetic model describing the most accurately the experimental data. DCF adsorption onto the studied materials occurs as a heterogeneous process, with the experimental data fitting best with the SIPS isotherm. The sample obtained through cosynthesis developed a maximum adsorption capacity of 648 mg/g. Full article
(This article belongs to the Special Issue New Applications of Layered Double Hydroxide-Based Materials)
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16 pages, 31153 KiB  
Article
Co-Precipitated Ni-Mg-Al Hydrotalcite-Derived Catalyst Promoted with Vanadium for CO2 Methanation
by Paulina Summa, Katarzyna Świrk, Dominik Wierzbicki, Monika Motak, Ivo Alxneit, Magnus Rønning and Patrick Da Costa
Molecules 2021, 26(21), 6506; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26216506 - 28 Oct 2021
Cited by 12 | Viewed by 2000
Abstract
Co-precipitated Ni-Mg-Al hydrotalcite-derived catalyst promoted with vanadium were synthesized with different V loadings (0–4 wt%) and studied in CO2 methanation. The promotion with V significantly changes textural properties (specific surface area and mesoporosity) and improves the dispersion of nickel. Moreover, the vanadium [...] Read more.
Co-precipitated Ni-Mg-Al hydrotalcite-derived catalyst promoted with vanadium were synthesized with different V loadings (0–4 wt%) and studied in CO2 methanation. The promotion with V significantly changes textural properties (specific surface area and mesoporosity) and improves the dispersion of nickel. Moreover, the vanadium promotion strongly influences the surface basicity by increasing the total number of basic sites. An optimal loading of 2 wt% leads to the highest activity in CO2 methanation, which is directly correlated with specific surface area, as well as the basic properties of the studied catalysts. Full article
(This article belongs to the Special Issue New Applications of Layered Double Hydroxide-Based Materials)
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16 pages, 20790 KiB  
Article
The Influence of the Preparation Method on the Physico-Chemical Properties and Catalytic Activities of Ce-Modified LDH Structures Used as Catalysts in Condensation Reactions
by Alexandra-Elisabeta Stamate, Rodica Zăvoianu, Octavian Dumitru Pavel, Ruxandra Birjega, Andreea Matei, Marius Dumitru, Ioana Brezeștean, Mariana Osiac and Ioan-Cezar Marcu
Molecules 2021, 26(20), 6191; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26206191 - 14 Oct 2021
Cited by 5 | Viewed by 2033
Abstract
Mechanical activation and mechanochemical reactions are the subjects of mechanochemistry, a special branch of chemistry studied intensively since the 19th century. Herein, we comparably describe two synthesis methods used to obtain the following layered double hydroxide doped with cerium, Mg3Al0.75 [...] Read more.
Mechanical activation and mechanochemical reactions are the subjects of mechanochemistry, a special branch of chemistry studied intensively since the 19th century. Herein, we comparably describe two synthesis methods used to obtain the following layered double hydroxide doped with cerium, Mg3Al0.75Ce0.25(OH)8(CO3)0.5·2H2O: the mechanochemical route and the co-precipitation method, respectively. The influence of the preparation method on the physico-chemical properties as determined by multiple techniques such as XRD, SEM, EDS, XPS, DRIFT, RAMAN, DR-UV-VIS, basicity, acidity, real/bulk densities, and BET measurements was also analyzed. The obtained samples, abbreviated HTCe-PP (prepared by co-precipitation) and HTCe-MC (prepared by mechanochemical method), and their corresponding mixed oxides, Ce-PP (resulting from HTCe-PP) and Ce-MC (resulting from HTCe-MC), were used as base catalysts in the self-condensation reaction of cyclohexanone and two Claisen–Schmidt condensations, which involve the reaction between an aromatic aldehyde and a ketone, at different molar ratios to synthesize compounds with significant biologic activity from the flavonoid family, namely chalcone (1,3-diphenyl-2-propen-1-one) and flavone (2-phenyl-4H-1benzoxiran-4-one). The mechanochemical route was shown to have indisputable advantages over the co-precipitation method for both the catalytic activity of the solids and the costs. Full article
(This article belongs to the Special Issue New Applications of Layered Double Hydroxide-Based Materials)
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12 pages, 3493 KiB  
Article
Synthesis of Hybrid Organic-Inorganic Hydrotalcite-Like Materials Intercalated with Duplex Herbicides: The Characterization and Simultaneous Release Properties
by Sheikh Ahmad Izaddin Sheikh Mohd Ghazali, Is Fatimah and Farah Liyana Bohari
Molecules 2021, 26(16), 5086; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26165086 - 22 Aug 2021
Cited by 2 | Viewed by 1699
Abstract
In this study, a controlled-release formulation of duplex herbicides, namely, 2,4,5-trichlorophenoxybutyric acid (TBA) and 3,4-dichlorophenoxy-acetic acid (3,4D), was simultaneously embedded into Zn-Al-layered double hydroxides (LDHs). The resulting nanohybrid Zinc-Aluminium-3,4D-TBA (ZADTX) was composed of a well-ordered crystalline layered structure with increasing basal spacing from [...] Read more.
In this study, a controlled-release formulation of duplex herbicides, namely, 2,4,5-trichlorophenoxybutyric acid (TBA) and 3,4-dichlorophenoxy-acetic acid (3,4D), was simultaneously embedded into Zn-Al-layered double hydroxides (LDHs). The resulting nanohybrid Zinc-Aluminium-3,4D-TBA (ZADTX) was composed of a well-ordered crystalline layered structure with increasing basal spacing from 8.9 Å to 20.0 Å in the Powder X-ray Diffraction (PXRD) with 3,4D and TBA anions located in the gallery of LDHs with bilayer arrangement. The release of 3,4D and TBA fit the pseudo-second-order model. This duplex nanohybrid possessed a well-controlled release property (53.4% release from TBA and 27.8% release from 3,4D), which was highly effective, requiring the use of a small quantity and, hence, environmentally safer. Full article
(This article belongs to the Special Issue New Applications of Layered Double Hydroxide-Based Materials)
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