Special Issue "Layered Double Hydroxides (LDH) and LDH-based hybrid composites"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: 31 December 2019.

Special Issue Editor

Prof. Dr. Jakub Matusik
E-Mail Website
Guest Editor
Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
Interests: layered double hydroxides (LDHs); clays and clay minerals; zeolites; organo-minerals; advanced adsorbents; mineral-based composites; mineral-based structures for wastewater purification and remediation; polymer–mineral nanocomposites

Special Issue Information

Dear Colleagues,

LDHs are a class of two-dimensional layered anionic structures. They are composed of positively charged brucite-like layers and charge balancing hydrated anions located in the interlayer. The features of LDH phases include the following: ease of synthesis, controllable and flexible chemical composition, and relatively large surface area. These contribute to their potential applications in adsorption-based processes, catalysis, electrochemistry, polymer chemistry, biomedicine, and wastewater treatment.

In recent years, LDH materials have been extensively studied as components of hybrid materials. It is possible and desirable that the support can play a synergistic role in the tested system (e.g. it can induce dual adsorption properties, increase the composite stability at a low pH). Such approach can also reduce production costs of the materials where the active LDH component is in a sufficient amount for the desired application.

The Special Issue will cover, but not be limited to, the following topics:

+ the synthesis of pure LDH phases of different chemical compositions by various experimental approaches;

+ the synthesis of hybrid LDH-based materials involving the use of clays and clay minerals, zeolites, metals, and oxides/hydroxides;

+ the characterization of LDH and LDH-based materials at an atomic level with advanced analytical methods;

+ applications of LDH and LDH-based materials in the adsorption, catalysis, and synthesis of polymer composites and drug delivery.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full research papers, short communications, and reviews are welcome.

Prof. Dr. Jakub Matusik
Guest Editor

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 papers will be 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. Materials 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 1800 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 hydroxides
  • LDH-based hybrids
  • adsorption
  • catalysis
  • drug delivery
  • composites

Published Papers (2 papers)

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Research

Open AccessArticle
Performance of Halloysite-Mg/Al LDH Materials for Aqueous As(V) and Cr(VI) Removal
Materials 2019, 12(21), 3569; https://doi.org/10.3390/ma12213569 - 31 Oct 2019
Abstract
This research focused on the investigation of layered double hydroxide (LDH)/halloysite materials’ adsorption efficiency and mechanisms in reactions with aqueous As(V) and Cr(VI) in a broad pH range. The materials consisting of Mg/Al LDH and halloysite were synthesized using both direct precipitation and [...] Read more.
This research focused on the investigation of layered double hydroxide (LDH)/halloysite materials’ adsorption efficiency and mechanisms in reactions with aqueous As(V) and Cr(VI) in a broad pH range. The materials consisting of Mg/Al LDH and halloysite were synthesized using both direct precipitation and physical mixing methods. The XRD, FTIR, DTA, SEM and XPS methods were used to evaluate the quality of the obtained materials and get insight into removal mechanisms. The XRD, FTIR and DTA confirmed LDH formation and showed the dominating presence of intercalated carbonates in the LDH structure. The SEM of the materials revealed characteristic agglomerates of layered LDH particles deposited on halloysite tubular forms. The raw LDH phases showed high removal efficiency of both As(V) and Cr (VI) for initial pH in the range of 3–7. In the studied concentration range the materials containing 25 wt % of LDH exhibited a removal efficiency very similar to the raw LDH. In particular, the halloysite presence in the materials’ mass had a positive effect in the reactions with As(V), which was removed by chemisorption. At a low pH the LDH component underwent partial dissolution, which lowered the adsorption efficiency. Apart from the anion exchange mechanism at a low pH the Cr(VI) was removed via formation of MgCrO4 with Mg (II) being released from the LDH structure. The XPS spectra for As(V) did not show changes in oxidation state in the reactions. In turn, a partial reduction of Cr(VI) to Cr(III) was observed, especially at a high pH. The use of materials composed of two different minerals is promising due to reduction of costs as well as prevention of adsorbent swelling. This opens the possibility of its use in dynamic adsorption flow through systems. Full article
(This article belongs to the Special Issue Layered Double Hydroxides (LDH) and LDH-based hybrid composites)
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Open AccessArticle
Mg/Al LDH Enhances Sulfate removal and Clarification of AMD Wastewater in Precipitation Processes
Materials 2019, 12(14), 2334; https://doi.org/10.3390/ma12142334 - 23 Jul 2019
Cited by 2
Abstract
The sulfate removal from acid mine drainage (AMD) water (initial concentration: 5301 mg/L) was investigated by precipitation and/or adsorption using calcium hydroxide (Ca(OH)2) and synthetic layered double hydroxide (LDH) of the Mg/Al type. The exclusive use of LDH efficiently removed sulfates [...] Read more.
The sulfate removal from acid mine drainage (AMD) water (initial concentration: 5301 mg/L) was investigated by precipitation and/or adsorption using calcium hydroxide (Ca(OH)2) and synthetic layered double hydroxide (LDH) of the Mg/Al type. The exclusive use of LDH efficiently removed sulfates (64.2% reduction); however, alteration of its structure was observed due to low pH. The use of Ca(OH)2 in different doses calculated in relation to gypsum stoichiometry allowed to achieve an 86% removal of sulfates. Depending on the equilibrium pH, gypsum or ettringite were the main identified phases. The two-step removal, involving the use of Ca(OH)2 followed by LDH, was less efficient than the use of the Ca(OH)2/LDH mixture when the stoichiometric amount of Ca(OH)2 in relation to gypsum was applied. The application of mixture resulted in a fast pH increase, which prevented destruction of the LDH structure. Most importantly, the use of mixture significantly reduced the sludge volume and enhanced its settling velocity. Full article
(This article belongs to the Special Issue Layered Double Hydroxides (LDH) and LDH-based hybrid composites)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Zein-layered hydroxides bio-hybrids: strategies of synthesis and characterization
Authors: Ana C. S. Alcântara, Margarita Darder, Pilar Aranda, Eduardo Ruiz-Hitzky

Title: Starch as template for synthesis of nanocrystalline hydrotalcites
Authors: A. Michalik, B. D. Napruszewska, A. Walczyk, J. Kryściak-Czerwenka, D. Duraczyńska, R. Dula, E.M. Serwicka
Affiliation: Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland

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