Preparation of hydroxy double salts exchanged by organic compounds

1998 ◽  
Vol 13 (4) ◽  
pp. 848-851 ◽  
Author(s):  
Hiroyuki Morioka ◽  
Hideyuki Tagaya ◽  
Masa Karasu ◽  
Jun-ichi Kadokawa ◽  
Koji Chiba
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Layered Double Hydroxides ◽  
Interlayer Spacing ◽  
Layered Materials ◽  
Exchange Reactions ◽  
Double Salts ◽  
Hydroxy Double Salts ◽  
Double Hydroxides ◽  
Positively Charged

Hydroxy double salts (HDS's) comprise a class of layered materials that are similar to layered double hydroxides (LDH's) and show a comparable intracrystalline reactivity. Their anion exchange reactions occur with preincorporated anions in the hydroxide layer and with anions bound as gegenions of the positively charged layers, respectively. In this study, nitrate and acetate anions of HDS's were exchanged with anionic monoand di-carboxylic acids, and we confirmed that interlayer spacing of HDS's increased depending on the size of mono- and di-carboxylic acids. Moreover, we have prepared photofunctional materials by exchange reaction with azobenzene-p-carboxylic acid and 4–4′-azobenzenedicarboxylic acid.

scholarly journals Controlled Release Kinetics in Hydroxy Double Salts: Effect of Host Anion Structure

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Stephen Majoni ◽  
Jeanne M. Hossenlopp
Keyword(s):  
Controlled Release ◽  
Dipole Moments ◽  
Release Kinetics ◽  
Strong Dependence ◽  
Exchange Reactions ◽  
Metal Hydroxides ◽  
Double Salts ◽  
Rate Of Reaction ◽  
Hydroxy Double Salts ◽  
Double Hydroxides

Nanodimensional layered metal hydroxides such as layered double hydroxides (LDHs) and hydroxy double salts (HDSs) can undergo anion exchange reactions releasing intercalated anions. Because of this, these metal hydroxides have found applications in controlled release delivery of bioactive species such as drugs and pesticides. In this work, isomers of hydroxycinnamate were used as model compounds to systematically explore the effects of anion structure on the rate and extent of anion release in HDSs. Following intercalation and subsequent release of the isomers, it has been demonstrated that the nature and position of substituent groups on intercalated anions have profound effects on the rate and extent of release. The extent of release was correlated with the magnitude of dipole moments while the rate of reaction showed strong dependence on the extent of hydrogen bonding within the layers. The orthoisomer showed a more sustained and complete release as compared to the other isomers.

Synthesis of Li/Al layered double hydroxide-guest composites under mild acid conditions

Clay Minerals ◽  
2004 ◽  
Vol 39 (2) ◽  
pp. 115-121 ◽  
Author(s):  
Deng-Shiu Yang ◽  
Ming-Kuang Wang ◽  
Shan-Li Wang
Keyword(s):  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Starting Material ◽  
Anionic Clays ◽  
Step Procedure ◽  
Alkaline Conditions ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Mild Acid ◽  
Positively Charged

AbstractLayered double hydroxides (LDHs) are known as ‘anionic clays’. They comprise a class of material with positively charged octahedral double hydroxyl layers and exchangeable anions. The Li/Al LDH term includes a group of LDHs with Li/Al octahedral double hydroxyl layers. We have demonstrated a modifed method, using Li/Al LDH-OH (OH− as interlayer anions) as the starting material, for preparing Li/Al LDH-X (X represents interlayer anions, including dioctyl sulphosuccinate (DOSS), dodecyl sulphate (DDS), mercaptoacetate (MA), EDTA, Tiron and dichromate) under mild acid conditions (pH in the range 4 to 5). However, in the case of acidsensitive anions, Fe(CN)64−, Li/Al LDH-Fe(CN)64− can be prepared by a two-step procedure using Li/Al LDH-DOSS or similar compounds as intermediates to react with acid-sensitive anions under mild alkaline conditions (pH ≈ 9).

Anion-exchange reactions of layered double hydroxides

1990 ◽  
Vol 29 (26) ◽  
pp. 5201-5207 ◽  
Author(s):  
Martina Meyn ◽  
Klaus Beneke ◽  
Gerhard Lagaly
Keyword(s):  
Anion Exchange ◽  
Layered Double Hydroxides ◽  
Exchange Reactions ◽  
Double Hydroxides

scholarly journals Mn-Fe Layered Double Hydroxide Intercalated with Ethylene-Diaminetetraacetate Anion: Synthesis and Removal of As(III) from Aqueous Solution around pH 2–11

2020 ◽  
Vol 17 (24) ◽  
pp. 9341
Author(s):  
Guifeng Liu ◽  
Zongqiang Zhu ◽  
Ningning Zhao ◽  
Yali Fang ◽  
Yingying Gao ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Layered Double Hydroxides ◽  
Interlayer Spacing ◽  
Maximum Adsorption Capacity ◽  
Hydroxyl Groups ◽  
Surface Hydroxyl ◽  
Xps Characterization ◽  
Ph Range ◽  
Double Hydroxide ◽  
Double Hydroxides

A novel adsorbent Mn-Fe layered double hydroxides intercalated with ethylenediaminete-traacetic (EDTA@MF-LDHs) was synthesized by a low saturation coprecipitation method. The behavior and mechanism of As(III) removed by EDTA@MF-LDHs were investigated in detail in comparison with the carbonate intercalated Mn-Fe layered double hydroxides (CO3@MF-LDHs). The results showed that EDTA@MF-LDHs had a higher removal efficiency for As(III) than As(V) with a broader pH range than CO3@MF-LDH. The large adsorption capacity of EDTA@MF-LDHs is related to its large interlayer spacing and the high affinity of its surface hydroxyl groups. The maximum adsorption capacity for As(III) is 66.76 mg/g at pH 7. The FT-IR and XPS characterization indicated that the removal mechanism of the As(III) on EDTA@MF-LDHs include surface complexation, redox, and ion exchange.

scholarly journals Liquid phase exfoliation of carbonate-intercalated layered double hydroxides

2019 ◽  
Vol 55 (23) ◽  
pp. 3315-3318 ◽  
Author(s):  
Jose A. Carrasco ◽  
Andrew Harvey ◽  
Damien Hanlon ◽  
Vicent Lloret ◽  
Dave McAteer ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Anion Exchange ◽  
Layered Double Hydroxides ◽  
Exchange Reactions ◽  
Liquid Phase Exfoliation ◽  
Double Hydroxides

Direct exfoliation of carbonate layered double hydroxides has been achieved by using a novel horn-probe sonic tip, avoiding the development of time-consuming anion-exchange reactions.

scholarly journals Highlights on the Catalytic Properties of Polyoxometalate-Intercalated Layered Double Hydroxides: A Review

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 57 ◽  
Author(s):  
Stamate ◽  
Pavel ◽  
Zavoianu ◽  
Marcu
Keyword(s):  
Layered Double Hydroxides ◽  
Review Paper ◽  
Hybrid Composites ◽  
Layered Architecture ◽  
Fine Organic Synthesis ◽  
Current Review ◽  
Anionic Species ◽  
Double Hydroxides ◽  
Positively Charged ◽  
Fine Organic

Layered double hydroxides (LDH) are an extended class of two-dimensional anionic materials that are known for their unique lamellar structure, versatile composition, and tunable properties. The layered architecture allows the intercalation between the positively charged sheets of a vast variety of anionic species, including oxometalates and polyoxometalates (POM). The hybrid composites that were developed using POM and LDH show great advantages when compared to both parent materials causing the appearance of new functionalities, which may lead to remarkable contributions in many areas of application, especially in catalysis. The current review paper emphases all of the crucial works already existing in literature that are related to the large group of POM-LDH solids and their use as catalysts for fine organic synthesis. The new trends in the development of the POM-LDH catalysts are highlighted based on the overview of 121 scientific articles that were published between 1984 and 2019. The main topics are focused primarily on the synthesis, characterization, and the catalytic applications of different LDH systems hosting polyoxometalates with low, medium, and high nuclearity. The intense exploration of the POM-LDH field has led to the obtaining of countless effective catalysts used in various types of reactions, from condensation, esterification, halodecarboxylation, to oxidation and epoxidation.

Rationalization of liquid assisted grinding intercalation yields of organic molecules into layered double hydroxides by multivariate analysis

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 108431-108439 ◽  
Author(s):  
E. Conterosito ◽  
M. Milanesio ◽  
L. Palin ◽  
V. Gianotti
Keyword(s):  
Multivariate Analysis ◽  
Layered Double Hydroxides ◽  
Organic Molecules ◽  
Molecular Descriptors ◽  
Layered Materials ◽  
Double Hydroxides

PCA, coupled to molecular descriptors, proved to be an effective tool to rationalize the mechanochemical intercalation yields of layered materials.

ChemInform Abstract: Anion-Exchange Reactions of Hydroxy Double Salts.

ChemInform ◽  
2010 ◽  
Vol 24 (28) ◽  
pp. no-no
Author(s):  
M. MEYN ◽  
K. BENEKE ◽  
G. LAGALY
Keyword(s):  
Anion Exchange ◽  
Exchange Reactions ◽  
Double Salts ◽  
Hydroxy Double Salts

scholarly journals Recent Advances on the Application of Layered Double Hydroxides in Concrete—A Review

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1426
Author(s):  
Zahid M. Mir ◽  
Alexandre Bastos ◽  
Daniel Höche ◽  
Mikhail L. Zheludkevich
Keyword(s):  
Layered Double Hydroxides ◽  
Economic Losses ◽  
Recent Past ◽  
New Class ◽  
Recent Advances ◽  
Chloride Resistance ◽  
Potential Applications ◽  
Balanced Structure ◽  
Double Hydroxides ◽  
Positively Charged

The issue of chloride induced corrosion of reinforced concrete is a serious problem affecting infrastructure globally and causing huge economic losses. As such this issue has gained a considerable attention in the scientific community in the recent past. Layered Double Hydroxides (LDHs) have recently emerged as a new class of concrete-additives with a potential to increase the chloride resistance of concrete and mitigate corrosion. LDHs are clay like structures consisting of positively charged layers of cations with associated hydroxides and exchangeable anions in between the layers. Due to this charge balanced structure, LDHs possess the property of encapsulating an anion from the environment and replacing it with an exchangeable anion present in its layers. Potential applications include chloride entrapment in concrete and delivery of corrosion inhibiting anions. However, many versatile compositions of LDHs can be easily synthesized and their application as cement additives reach far beyond corrosion mitigation in concrete. This review presents a summary of recent advances on the applications of LDH in concrete. An extensive set of recently published literature has been critically reviewed and trends have been identified.

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