Inorganics

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Special Issue Editors

Dr. Haihua Xu

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Guest Editor

School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Interests: environmental engineering; heterogeneous catalysis; degradation of pharmaceutical pollutants; nanocatalysts for wastewater treatment; functionalized layered double hydroxides application

Dr. Sadaf Mutahir

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Guest Editor

Department of Chemistry, University of Sialkot, Sialkot, Pakistan
Interests: functional materials; MOFs and MOFs based materials for LIBs; water treatment; clay materials; computational studies

Dr. Sidi Zhu

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Guest Editor

Department of Chemical and Materials Engineering, University of Alberta, Alberta T6G 1H9, Canada
Interests: nanomaterials; interface science; computer simulation; water treatment; environmental engineering

Special Issue Information

Dear Colleagues,

Layered Double Hydroxides (LDHs) are two-dimensional (2D) anionic clays composed of positively charged M(OH) octahedra in host layers and both anions and water molecules in the interlayer gallery. LDHs have many underlying applications in heterogeneous catalysis owing to their desirable performance, including moderate chemistry stable characteristics, broad specific surface area, high customization possibility and environmental friendliness, relatively simple preparation, and low cost. Besides, LDH-based catalysts are also widely applied as catalysis materials in wastewater treatment.

Therefore, this Special Issue will focus on the recent advances in Catalytic Applications via Layered Double Hydroxides. We invite the submission of original research articles and short critical reviews on themes including, but not limited to:

Heterogeneous Catalysis
Degradation of Pharmaceutical Pollutants
Nanocatalysts for Wastewater Treatment
Functionalized Layered Double Hydroxides application

We look forward to receiving your contributions.

Dr. Haihua Xu
Dr. Sadaf Mutahir
Dr. Sidi Zhu
Guest Editors

Manuscript Submission Information

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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. Inorganics is an international peer-reviewed open access monthly 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

nanocatalysts
pharmaceutical pollutants
heterogeneous catalysis
wastewater treatment
layered double hydroxides

Published Papers (2 papers)

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Research

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16 pages, 4189 KiB

Open AccessArticle

Synthesis of CuAl-LDHs by Co-Precipitation and Mechanochemical Methods and Selective Hydrogenation Catalysts Based on Them

by Olga B. Belskaya, Elena N. Terekhova, Oksana V. Gorbunova, Ivan V. Muromtsev, Mikhail V. Trenikhin, Aleksei N. Salanov and Vladimir A. Likholobov

Inorganics 2023, 11(6), 247; https://doi.org/10.3390/inorganics11060247 - 7 Jun 2023

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Abstract

The paper presents the results of the synthesis and study of CuAl layered double hydroxides (LDHs) as well as their application as catalysts for the selective hydrogenation of crotonaldehyde. Phase-homogeneous LDHs were obtained by co-precipitation and mechanochemical methods, and critical parameters ensuring the formation of the target product were identified. In the case of coprecipitation, the formation of LDH is most affected by the pH of the reaction medium and the CO₃²⁻/Al³⁺ ratio. The optimal CO₃²⁻/Al³⁺ ratio is ca. 0.5–0.8 and pH 9.5–10.0. When mechanochemical synthesis is used, at 500 m·s⁻² and 60 min, it is possible to obtain a single-phase CuAl LDH, whereas at higher energies, LDH is destroyed. The mechanochemical method makes it possible not only to reduce the synthesis time and the amount of alkaline wash water but also to obtain more dispersed copper particles with a higher hydrogenating activity. The conversion of 2-butenal (T = 80 °C, P = 0.5 MPa, 180 min, ethanol) for this sample was 99.9%, in contrast to 50.5% for the catalyst obtained by co-precipitation. It is important that, regardless of the conversion, both catalysts showed high selectivity (S = 90–95%) for the double bond hydrogenation. Full article

(This article belongs to the Special Issue Layered Double Hydroxides for Catalytic Applications)

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Review

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22 pages, 5134 KiB

Open AccessReview

In Situ Techniques for Characterization of Layered Double Hydroxide-Based Oxygen Evolution Catalysts

by Andraž Mavrič and Matjaž Valant

Inorganics 2023, 11(7), 296; https://doi.org/10.3390/inorganics11070296 - 13 Jul 2023

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Abstract

Functional layered double hydroxide (LDH) usually contains different cationic substitutes to increase the activity of the oxygen evolution reaction (OER). The intrinsic OER activity of LDH materials is connected with the chemical composition and dispersion of metal cations substitutions in the matrix phase. The potential induced phase transitions, in particular hydroxide-to-oxyhydroxide transitions, are a predisposition for the high OER activity of LDH materials and can be followed by coupling the electrochemical experiments with spectroscopic techniques. The understanding of LDH catalysts under electrochemical conditions also allows an understanding of the behavior of OER catalysts based on transition metals, metal-chalcogenides, -pnictides, -carbides, and metal–organic frameworks. The surfaces of those materials are intrinsically poor OER catalysts. However, they act as precursors to catalysts, which are oxidized into a metal (oxy)hydroxide. This review summarizes the use of in situ techniques for the characterization of LDH-based OER electrocatalysts and presents the influence of these techniques on the understanding of potential induced phase transitions, identification of active sites, and reaction mechanisms. Full article

(This article belongs to the Special Issue Layered Double Hydroxides for Catalytic Applications)

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