Intercalation of layered double hydroxides by poly(oxyalkylene)-amidocarboxylates: tailoring layered basal spacing

Mycotoxins in feed and food are highly toxic and pose a serious danger even at very low concentrations. The use of bentonites in animal diet can reduce toxin bioavailability. However, some mycotoxins like fumonisin B1 (FB1) form anionic species which excludes the use of negatively charged clays. Layered double hydroxides (LDH) with anion-exchange properties, in theory, can be perfect candidates to adsorb FB1. However, fundamental research on the use of LDH for mycotoxins removal is scarce and incomplete. Thus, the presented study was designed to explore such a possibility. The LDH materials with differing chemistry and layer charge were synthesized by co-precipitation both from metal nitrates and chlorides and were then tested for FB1 removal. XRD, FTIR, XPS, and chemical analysis were used for the LDH characterization and to obtain insight into the removal mechanisms. A higher adsorption capacity was observed for the Mg/Al LDH samples (~0.08–0.15 mol/kg) in comparison to the Mg/Fe LDH samples (~0.05–0.09 mol/kg) with no difference in removal efficiency between Cl and NO3 intercalated LDH. The adsorption capacity increased along with lower layer charge of Mg/Al and was attributed to the lower content of bonded carbonates and the increase of non-polar sites which led to matching between the adsorption domains of LDH with FB1. The FTIR analysis confirmed the negative effect of carbonates which hampered the adsorption at pH 7 and led to the highest adsorption at pH 5 (FB1 content ~15.8 ± 0.75 wt.%). The fast surface adsorption (1–2 min) was dominant and XRD analysis of the basal spacing indicated that no FB1 intercalation occurred in the LDH. The XPS confirmed a strong interaction of FB1 with Mg sites of LDH at pH 5 where the interaction with FB1 carboxylate moieties COO− was confirmed. The research confirmed a high affinity and selectivity of LDH structures towards anionic forms of FB1 mycotoxin.

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Modification of nano-sized layered double hydroxides by long-chain organic aliphatic surfactants

Journal of the Serbian Chemical Society ◽

10.2298/jsc0803321a ◽

2008 ◽

Vol 73 (3) ◽

pp. 321-331 ◽

Cited By ~ 4

Author(s):

Ramasamy Anbarasan ◽

Wanduc Lee ◽

Seung Soon

Keyword(s):

Thermal Stability ◽

Layered Double Hydroxides ◽

Exchange Process ◽

Xrd Analysis ◽

Basal Spacing ◽

Ion Exchange Process ◽

Dodecanedioic Acid ◽

Double Hydroxides ◽

Thermal Stability Of ◽

Long Chain

The inter-layer anion of layered double hydroxides (LDH) with a hydrotalcite (HT)-like structure was ion-exchanged with various organic surfactants, particularly with long chain aliphatic surfactants. After the ion-exchange process, the basal spacing of the LDH was increased and the increase of the basal spacing depended on various factors, such as the intercalation capacity functionality and orientation capability of the surfactant. Of the employed surfactants, stearic acid intercalated LDH showed the highest increase of the basal spacing, which was confirmed by XRD analysis. FTIR results supported the interaction of the surfactants with the LDH. In addition, an increase in the thermal stability of the dodecanedioic acid intercalated HT was evidenced by the TGA method.

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Synthesis and release behavior of layered double hydroxides–carbamazepine composites

Scientific Reports ◽

10.1038/s41598-021-00117-9 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Ma. F. Peralta ◽

S. N. Mendieta ◽

I. R. Scolari ◽

G. E. Granero ◽

M. E. Crivello

Keyword(s):

Layered Double Hydroxides ◽

Release Kinetics ◽

Sodium Cholate ◽

Basal Spacing ◽

Reconstruction Method ◽

Formal Charge ◽

Axis Parallel ◽

Double Hydroxides ◽

Ray Patterns ◽

Kinetics Of

AbstractCarbamazepine (CBZ) was incorporated into layered double hydroxides (LDH) to be used as a controlled drug system in solid tumors. CBZ has a formal charge of zero, so its incorporation in the anionic clay implies a challenge. Aiming to overcome this problem, CBZ was loaded into LDH with sodium cholate (SC), a surfactant with negative charge and, for comparison, without SC by the reconstruction method. Surprisingly, it was found that both resultant nanocomposites had similar CBZ encapsulation efficiency, around 75%, and the LDH-CBZ system without SC showed a better performance in relation to the release kinetics of CBZ in simulated body fluid (pH 7.4) and acetate buffer simulating the cellular cytoplasm (pH 4.8) than the system with SC. The CBZ dimensions were measured with Chem3D and, according to the basal spacing obtained from X-ray patterns, it can be arranged in the LDH-CBZ system as a monolayer with the long axis parallel to the LDH layers. Fourier transform infrared spectroscopy and solid state NMR measurements confirmed the presence of the drug, and thermogravimetric analyses showed an enhanced thermal stability for CBZ. These results have interesting implications since they increase the spectrum of LDH application as a controlled drug system to a large number of nonionic drugs, without the addition of other components.

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Behavior of Layered Double Hydroxides Having Different Divalent Transition Metal Groups

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.563.94 ◽

2014 ◽

Vol 563 ◽

pp. 94-101 ◽

Cited By ~ 2

Author(s):

Mazidah Mamat ◽

Tei Tagg ◽

Wan Mohd Khairul ◽

Mohd Aidil Adhha Abdullah ◽

Norhayati Mohd Tahir ◽

...

Keyword(s):

Weight Loss ◽

Transition Metal ◽

Layered Double Hydroxides ◽

Divalent Cations ◽

Precipitation Method ◽

Basal Spacing ◽

Highest Weight ◽

Ft Ir ◽

Co Precipitation ◽

Double Hydroxides

The layered double hydroxides (LDHs) with different divalent transition metal groups and nitrate as a counter anion were investigated. Three d-block divalent metals namely cobalt (Co), nickel (Ni) and copper (Cu) were selected. The cobalt/aluminium (CoAN)-, nickel/aluminium (NiAN)- and copper/aluminium (CuAN)-layered double hydroxides were successfully synthesized via co-precipitation method. All the obtained LDHs were characterized by PXRD, FT-IR, ICP-OES, CHNS and TGA/DTG analysis. Interestingly, behavior of the LDHs was dependent on the size of divalent cations. PXRD showed the basal spacing decrease in the order NiAN (0.88nm)> CuAN (0.87nm) > CoAN (0.74nm), and in a linear correlation with the increasing radii of the divalent cations. Similar trend is observed for the weight loss of LDHs, where NiAN has the highest weight loss (53%), followed by CuAN (43%) and CoAN (34%). Further elemental analysis showed the content of trivalent metal cations, nitrate anions and water molecules in the LDHs decrease with the increasing radii.

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Layered double hydroxides: matrices for storage and source of boron for plant growth

Clay Minerals ◽

10.1180/clm.2018.6 ◽

2018 ◽

Vol 53 (1) ◽

pp. 79-89 ◽

Cited By ~ 5

Author(s):

Gustavo Franco de Castro ◽

Jader Alves Ferreira ◽

Denise Eulálio ◽

Silas Junior de Souza ◽

Sarah Vieira Novais ◽

...

Keyword(s):

Plant Growth ◽

Layered Double Hydroxides ◽

Dry Matter ◽

Statistical Difference ◽

Crop Productivity ◽

Absorption Efficiency ◽

Basal Spacing ◽

Plant Yield ◽

Constant Ph ◽

Double Hydroxides

ABSTRACTThe increase of the absorption efficiency of boron (B) by plants is essential for increasing crop productivity. The intercalation of B in MgAl layered double hydroxides (LDHs) is an alternative to evaluating how these materials can provide B to plants. In this work, a MgAl LDH intercalated with borate ions (Mg2Al-B-LDH) was synthesized by the constant pH coprecipitation method, and the material produced was evaluated as a matrix for storage and as a source of B for plants. The Mg2Al-B-LDH was characterized by XRD, ATR-FTIR, TGA-DTA, specific surface area, pore size and volume, and SEM. A bioassay was performed to verify the supply of B to plants from the two sources in the forms of H3BO3 and of Mg2Al-B-LDH to sunflower plants grown in pots. The LDH basal spacing value of 12.0 Å is characteristic of intercalation of tetraborate octahydrate ions [B4O5(OH)42−]·8H2O between the layers. There was an increase in the dry matter (DM) and B content of the plants relative to those treatments where no B was added. The lack of statistical difference for plant yield between the two sources of B suggests a lack of stability of the Mg2Al-B-LDH structure under the acidic condition of the soil.

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Machine Learning Aided Discovery of the Layered Double Hydroxides with the Largest Basal Spacing for Super-Capacitors

International Journal of Electrochemical Science ◽

10.20964/2021.11.22 ◽

2021 ◽

pp. ArticleID:211146

Author(s):

Kailiang Lu ◽

Keyword(s):

Machine Learning ◽

Layered Double Hydroxides ◽

Basal Spacing ◽

Double Hydroxides ◽

Super Capacitors

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Influence on Stucture of Layered Double Hydroxides with Different Methods Synthesis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.160-162.656 ◽

2010 ◽

Vol 160-162 ◽

pp. 656-660

Author(s):

Hong Bo Yu ◽

Bing Xu ◽

Ling Xi Bian ◽

Hong Gao

Keyword(s):

Crystallite Size ◽

Hydrothermal Method ◽

Layered Double Hydroxides ◽

Target Material ◽

Basal Spacing ◽

Mechanochemical Method ◽

Ft Ir ◽

Double Hydroxides

This paper compares two methods for synthesizing a carbonate compound, Mg-Al-CO3 (Mg:Al=2:1), which is a layered double hydroxides (LDHs). The methods are mechanochemical method and hydrothermal method. The products characterized by XRD、SEM、FT-IR and TG-DTA. The results indicated that the target material was synthesized by different methods. The two kinds of well-crystallized materials with the same basal spacing d003=0.77nm, but their morphology were not same. The crystallite size of hydrothermal was larger than mechanochemistry.

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Synthesis and properties of CaAl-layered double hydroxides of hydrocalumite-type

Chemical Papers ◽

10.2478/s11696-013-0500-z ◽

2014 ◽

Vol 68 (5) ◽

Cited By ~ 12

Author(s):

Viktor Tóth ◽

Mónika Sipiczki ◽

Attila Pallagi ◽

Ákos Kukovecz ◽

Zoltán Kónya ◽

...

Keyword(s):

Layered Double Hydroxides ◽

Structural Information ◽

Basal Spacing ◽

Sem Images ◽

Alumina Production ◽

X Ray ◽

Precipitation Procedure ◽

Ion Contents ◽

Co Precipitation ◽

Double Hydroxides

AbstractCaAl-layered double hydroxides (CaAl-LDHs) with various carbonate ion contents are essentially formed in Bayer liquors during the causticisation step in alumina production. Under well-defined conditions hemicarbonate is formed, which is beneficial in the process of retrieving both Al(OH)4− and OH− ions. In the current work, Ca2Al-LDHs with various carbonate contents were prepared by the co-precipitation procedure and the products were dried in different ways. Structural information was obtained by a variety of methods, such as X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). Elemental maps were constructed through a combination of SEM images and EDX measurements. The targeted CaAl-hydrocalumites were successfully synthesised. It was found that the method used for drying did not influence the basal spacing although it significantly altered the particle sizes.

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Synthesis and release behavior of layered double hydroxides – carbamazepine composites

10.21203/rs.3.rs-112227/v1 ◽

2020 ◽

Author(s):

Maria Peralta ◽

Silvia Mendieta ◽

Ivana Scolari ◽

Gladys Granero ◽

Monica Crivello

Keyword(s):

Drug Delivery ◽

Layered Double Hydroxides ◽

Controlled Drug Delivery ◽

Sodium Cholate ◽

Basal Spacing ◽

Reconstruction Method ◽

X Rays ◽

Formal Charge ◽

Axis Parallel ◽

Double Hydroxides

Abstract Carbamazepine (CBZ) was incorporated into Layered Double Hydroxides (LDH) to be used as controlled drug delivery in solid tumors. CBZ has a formal charge of 0, which implies a challenge to be incorporated in the anionic clay. Aiming to overcome this problem, CBZ was first incorporated in micelles of sodium cholate (SC), a surfactant with negative charge. CBZ in SC micelles and, for comparison, free CBZ were incorporated in LDH by reconstruction method. It was found that resultant nano-composites had similar CBZ encapsulation efficiency, around 75 %, but drug release in simulated body fluid (pH 7.4) and acetate buffer (pH 4.8) was efficient only with the LDH-CBZ sample. CBZ dimensions were measured with Chem3D and, according to the basal spacing obtained from X rays patterns, it can arrange as monolayer with the long axis parallel to the LDH layers. Fourier Transform Infrared Spectroscopy confirmed the incorporation of the drug. Thermogravimetric analyses showed and enhanced thermal stability for CBZ. These results have interesting implications since they increase the spectrum of LDH application as controlled drug delivery to a large number of non-ionic drugs, without the addition of other components.

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