Layered Double Hydroxides and the Environment: An Overview

Jaiswal, Amita; Gautam, Ravindra Kumar; Chattopadhyaya, M. C.

doi:10.1002/9781118773857.ch1

Cited by 12 publications

(12 citation statements)

References 134 publications

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“…On one hand, the use of LDH has been investigated for environmental remediation and phosphate adsorption [ 18 , 19 ]. For instance, Luengo et al [ 20 ] studied LDH matrices synthesized by the coprecipitation method for phosphate adsorption and the results showed these to be promising environmentally friendly materials for use in aquatic systems.…”

Section: Introductionmentioning

confidence: 99%

Potential Sustainable Slow-Release Fertilizers Obtained by Mechanochemical Activation of MgAl and MgFe Layered Double Hydroxides and K2HPO4

et al. 2019

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This study describes the behavior of potential slow-release fertilizers (SRF), prepared by the mechanochemical activation of calcined Mg2Al-CO3 or Mg2Fe-CO3 layered double hydroxides (LDH) mixed with dipotassium hydrogen phosphate (K2HPO4). The effects of LDH thermal treatment on P/K release behavior were investigated. Characterizations of the inorganic composites before and after release experiments combined X-Ray diffraction (XRD), Fourier-transform infra-red spectroscopy (FTIR), solid-state nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). The best release profile (<75% in 28 days and at least 75% release) was obtained for MgAl/K2HPO4 (9 h milling, 2:1 molar ratio, MR). Compared to readily used K2HPO4, milling orthophosphate into LDH matrices decreases its solubility and slows down its release, with 60% and 5.4% release after 168 h for MgAl/K2HPO4 and MgFe/K2HPO4 composites, respectively. Mechanochemical addition of carboxymethylcellulose to the LDH/K2HPO4 composites leads to a noticeable improvement of P release properties.

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Section: Introductionmentioning

confidence: 99%

Potential Sustainable Slow-Release Fertilizers Obtained by Mechanochemical Activation of MgAl and MgFe Layered Double Hydroxides and K2HPO4

et al. 2019

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“…The hybrid material is beneficial in the light olefins production because it also provides the alkaline basic sites, which are highly dispersed on external surfaces of zeolites obtained from the transformation of layered double hydroxides (LDH) at high temperature. [51,52,53,54] These behaviors relate to a decrease in the strong Brønsted acidity of zeolites, eventually resulting in a significant enchantment of light olefin selectivity compared with the pristine zeolite. To maximize the light olefins yield, the effect of LDH coating content in the composite on the catalytic performance in n-pentane cracking is systemically investigated in order to suppress completing hydride transfers and further side reactions.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, we report using the core‐shell composite of ZSM‐5@aqueous miscible organic‐layered double hydroxides (ZSM‐5@AMO‐LDHs) as the modified acid‐base catalyst in the catalytic cracking of hydrocarbon oils. The hybrid material is beneficial in the light olefins production because it also provides the alkaline basic sites, which are highly dispersed on external surfaces of zeolites obtained from the transformation of layered double hydroxides (LDH) at high temperature . These behaviors relate to a decrease in the strong Brønsted acidity of zeolites, eventually resulting in a significant enchantment of light olefin selectivity compared with the pristine zeolite.…”

Section: Introductionmentioning

confidence: 99%

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

et al. 2020

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Over the past decades, the catalytic cracking catalysts for hydrocarbon oil upgrading have been extensively developed to increase the yield of light olefins. In this context, we report the fabrication of the core‐shell ZSM‐5@aqueous miscible organic‐layered double hydroxides prepared by the growth of layered double hydroxides (LDH) precursors on zeolite surfaces. The deposited LDH results in a decrease of the number of strong Brønsted acid sites on zeolite surfaces and its transformation at high temperature leads to produce the highly dispersed metal oxides deposited on external surfaces of zeolites. Therefore, the acid‐base properties of designed surfaces are modified, eventually resulting in the suppression of competing hydride transfers and further side reactions. As a result, there is a significant enhancement in light olefins production compared with the pristine zeolite. In addition, the designed catalysts exhibit high recycling stability and reusability. This first example opens up the new perspectives for the development of modified acid‐base zeolites using zeolite@aqueous miscible organic‐layered double hydroxides for the catalytic upgrading of hydrocarbons.

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“…Layered double hydroxides (LDHs) have a favorable adsorbtion capacity of dye molecules and can compete well with other adsorbants. LDHs have shown a high capability for dye elimination by adsorption [3].…”

Section: Introductionmentioning

confidence: 99%

“…By adding magnetic property to Co-Al LDHs, the collecting of the particles becomes much easier. LDHs are named as hydrotalcite-like materials (because of the structure similarity) or named anion clays and lamellar host-guest materials which are very rare in nature [3] Most of the LDHs have a structure formula of [M(II)1−x M(III)x (OH)2] (A n− )x/n·H2O, which is similar to the hydrotalcites formula, [Mg6Al2 (OH)2] CO3·4H2O. In the LDH formula, M(II) and M(III) are di-and trivalent metals, respectively, 0.2 < x < 0.33 and A n− is the anion which is transferable between layers.…”

Section: Introductionmentioning

confidence: 99%

Methyl Orange Adsorption by Fe2O3@Co-Al-Layered Double Hydroxide

Jamshidi

Manteghi

2020

The 23rd International Electronic Conference on Synthetic Organic Chemistry

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A magnetic composite consisting of iron oxide and a cobalt-aluminum-layered double hydroxide, Fe2O3@Co-Al-layered double hydroxide was prepared through linking of Fe2O3 to Co-Al layered double hydroxide (LDH) by sodium acetate. Layered double hydroxides are generally described as [M 2+ 1-xM 3+ x(OH)2] [An-x/n·mH2O], where M 2+ and M 3+ are divalent and trivalent metal cations, respectively, and A is an n-valent interlayer guest anion. The composite was characterized by XRD, FTIR and UV-Vis. spectroscopy methods. Afterwards, the composite was used for methylorange adsorption in aqueous solution. The UV-Vis spectrum indicates that the adsorption process was satisfying. In effect, after several washings of the composite, no decrease of the adsorption capacity was observed.

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Layered Double Hydroxides and the Environment: An Overview

Cited by 12 publications

References 134 publications

Potential Sustainable Slow-Release Fertilizers Obtained by Mechanochemical Activation of MgAl and MgFe Layered Double Hydroxides and K2HPO4

Potential Sustainable Slow-Release Fertilizers Obtained by Mechanochemical Activation of MgAl and MgFe Layered Double Hydroxides and K2HPO4

Modified Acid‐Base ZSM‐5 Derived from Core‐Shell ZSM‐5@ Aqueous Miscible Organic‐Layered Double Hydroxides for Catalytic Cracking of n‐Pentane to Light Olefins

Methyl Orange Adsorption by Fe2O3@Co-Al-Layered Double Hydroxide

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