Layered Double Hydroxides

Shanmuganathan, Kadhiravan; Ellison, Christopher J.

doi:10.1016/b978-0-444-53808-6.00020-2

Cited by 21 publications

(8 citation statements)

References 114 publications

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“…Polypropylene is the second most widely produced plastic polymer after polyethylene and has a slightly higher chemical resistance than PE (Kenneth et al, 2005). It is created by polymerization of polypropylene gas, obtained from high temperature cracking of petroleum hydrocarbons and propane (Shanmuganathan and Ellison, 2014). Its high flexibility is another property that contributes to its sorption capacity (Koerner and Koerner, 2018).…”

Section: Polypropylene (Pp)mentioning

confidence: 99%

Physisorption and Chemisorption Mechanisms Influencing Micro (Nano) Plastics-Organic Chemical Contaminants Interactions: A Review

Agboola

Benson

2021

Front. Environ. Sci.

122

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Microplastics, which serve as sources and vector transport of organic contaminants in both terrestrial and marine environments, are emerging micropollutants of increasing concerns due to their potential harmful impacts on the environment, biota and human health. Microplastic particles have a higher affinity for hydrophobic organic contaminants due to their high surface area-to-volume ratio, particularly in aqueous conditions. However, recent findings have shown that the concentrations of organic contaminants adsorbed on microplastic surfaces, as well as their fate through vector distribution and ecological risks, are largely influenced by prevailing environmental factors and physicochemical properties in the aquatic environment. Therefore, this review article draws on scientific literature to discuss inherent polymers typically used in plastics and their affinity for different organic contaminants, as well as the compositions, environmental factors, and polymeric properties that influence their variability in sorption capacities. Some of the specific points discussed are (a) an appraisal of microplastic types, composition and their fate and vector transport in the environment; (b) a critical assessment of sorption mechanisms and major polymeric factors influencing organic contaminants-micro (nano) plastics (MNPs) interactions; (c) an evaluation of the sorption capacities of organic chemical contaminants to MNPs in terms of polymeric sorption characteristics including hydrophobicity, Van der Waals forces, π–π bond, electrostatic, and hydrogen bond interactions; and (d) an overview of the sorption mechanisms and dynamics behind microplastics-organic contaminants interactions using kinetic and isothermal models. Furthermore, insights into future areas of research gaps have been highlighted.

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Section: Polypropylene (Pp)mentioning

confidence: 99%

Physisorption and Chemisorption Mechanisms Influencing Micro (Nano) Plastics-Organic Chemical Contaminants Interactions: A Review

Agboola

Benson

2021

Front. Environ. Sci.

122

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“…Layered Double Hydroxides (LDHs), referred to as ‘anionic clays’, are lamellar inorganic solids in which anions are situated in the interlayer galleries and can be ion-exchanged. LDHs are characterized by variable chemical compositions, hydroxyl groups on the surfaces, and interlayer channels, and are considered greener flame retardants [ 85 ]. LDHs were decorated with an ionic liquid resulting in [Hmim][NTf 2 ]@LDHN nanocages that were added to Pebax exploiting the joint roles of the IL on the external surface, interlamellar spacing, and internal hollow core of LDHNs to improve CO 2 permselectivity [ 86 ].…”

Section: Materials For the Analysed Mmmsmentioning

confidence: 99%

“…In agreement with DSC analysis, the d-spacing decreased with increased Tg [ 83 ]. The Pebax/[Hmim][NTf 2 ]@LDHN MMMs showed smaller d-spacings in comparison with that of pure Pebax membrane (0.397 nm) due to the interaction of the filler with the polymer, as discussed below [ 85 ]. The d-spacing was reduced in AA-LDH-loaded membranes, enabling the increase in the CO 2 /CH 4 diffusion selectivity [ 87 ].…”

Section: Main Issues In Mmms Developmentmentioning

confidence: 99%

A Review of the Recent Progress in the Development of Nanocomposites Based on Poly(ether-block-amide) Copolymers as Membranes for CO2 Separation

Clarizia

Bernardo

2021

Polymers

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An inspiring challenge for membrane scientists is to exceed the current materials’ performance while keeping the intrinsic processability of the polymers. Nanocomposites, as mixed-matrix membranes, represent a practicable response to this strongly felt need, since they combine the superior properties of inorganic fillers with the easy handling of the polymers. In the global strategy of containing the greenhouse effect by pursuing a model of sustainable growth, separations involving CO2 are some of the most pressing topics due to their implications in flue gas emission and natural gas upgrading. For this purpose, Pebax copolymers are being actively studied by virtue of a macromolecular structure that comprises specific groups that are capable of interacting with CO2, facilitating its transport with respect to other gas species. Interestingly, these copolymers show a high versatility in the incorporation of nanofillers, as proved by the large number of papers describing nanocomposite membranes based on Pebax for the separation of CO2. Since the field is advancing fast, this review will focus on the most recent progress (from the last 5 years), in order to provide the most up-to-date overview in this area. The most recent approaches for developing Pebax-based mixed-matrix membranes will be discussed, evidencing the most promising filler materials and analyzing the key-factors and the main aspects that are relevant in terms of achieving the best effectiveness of these multifaceted membranes for the development of innovative devices.

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“…Among them, layered double hydroxides (LDHs), also known as anionic clays or hydrotalcite-like materials, which are constituted of positively charged sheets of hydroxides intercalated by negatively charged anions, have been used for several device applications including gas sensors, drug delivery, gas barriers, heavy metal reduction, catalysis and energy storage due to their astonishing properties, such as ion exchange, fire-retardancy, mechanical strength and thermal stability. 26–28 Layered double hydroxides are inorganic 2D structured synthetic clays represented by [M( ii ) 1− x M( iii ) x (OH − ) 2 ] x + [(X n − ) x / n · y H 2 O] x − consisting of divalent M( ii ) (Zn 2+ , Mg 2+ , Ca 2+ ) and trivalent M( iii ) (Al 3+ , Fe 3+ ) cations and an X anion (NO 3− , CO 3 2− , SO 4 2− , Cl − , OH − ). Furthermore, LDHs have also been used to enhance the β-phase and dielectric properties of polyvinylidene fluoride (PVDF) for energy device applications.…”

Section: Introductionmentioning

confidence: 99%

Unveiling a robust and high-temperature-stable two-dimensional ZnAl layered double hydroxide nanosheet based flexible triboelectric nanogenerator

Ritu,

Badatya,

Patel

et al. 2024

Nanoscale

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Layered Double Hydroxides

Cited by 21 publications

References 114 publications

Physisorption and Chemisorption Mechanisms Influencing Micro (Nano) Plastics-Organic Chemical Contaminants Interactions: A Review

Physisorption and Chemisorption Mechanisms Influencing Micro (Nano) Plastics-Organic Chemical Contaminants Interactions: A Review

A Review of the Recent Progress in the Development of Nanocomposites Based on Poly(ether-block-amide) Copolymers as Membranes for CO2 Separation

Unveiling a robust and high-temperature-stable two-dimensional ZnAl layered double hydroxide nanosheet based flexible triboelectric nanogenerator

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