2018
DOI: 10.1002/ejic.201701067
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Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

Abstract: Layered double hydroxides (LDHs) have long been thought to have low selectivity for NO 3 -. In contrast, it has recently been reported that LDHs with certain compositions show high selectivity for NO 3 -. The reason for the high selectivity has been unclear, although the ion sieve effect has been proposed as a possible mechanism. Moreover, small LDHs have been reported to show good anion exchanging ability. Given this background, a systematic study was conducted using Mg-Al LDHs with two different crystallinit… Show more

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Cited by 65 publications
(44 citation statements)
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“…[ 41 ] If the cation ratio of MgAl‐LDH increases, the charge density of the host layers decreases, which eminently affect the LDH selective adsorption of anion and the type of intercalated anions present at the interlayer. [ 42 ] Furthermore, the thermal stability of LDH can be affected by the cation ratio. For instance, Mg‐Al‐CO 3 LDH with the lowest R value of 2 revealed the highest thermal stability and the shortest height of an octahedral layer at ≈7.56 Å due to the increase in M 3+ , thus augmenting the electrostatic interaction between positively charged octahedral layers and negatively charged interlayers.…”
Section: Synthesis and Properties Of Ldhmentioning
confidence: 99%
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“…[ 41 ] If the cation ratio of MgAl‐LDH increases, the charge density of the host layers decreases, which eminently affect the LDH selective adsorption of anion and the type of intercalated anions present at the interlayer. [ 42 ] Furthermore, the thermal stability of LDH can be affected by the cation ratio. For instance, Mg‐Al‐CO 3 LDH with the lowest R value of 2 revealed the highest thermal stability and the shortest height of an octahedral layer at ≈7.56 Å due to the increase in M 3+ , thus augmenting the electrostatic interaction between positively charged octahedral layers and negatively charged interlayers.…”
Section: Synthesis and Properties Of Ldhmentioning
confidence: 99%
“…This corroborates the importance of CO 3 2− in CO 2 RR. [ 42 ] Intercalated CO 3 2+ has a good adsorption of CO 2 , hence augmenting the CO 2 RR activity [25a] . Moreover, CO 3 2− has also shown to participate in HER as a hole scavenger.…”
Section: Synthesis and Properties Of Ldhmentioning
confidence: 99%
“…This property has been termed as the ion exchange property of LDH [122]. As such LDHs can act as anion adsorbents or anion scavengers, in different environments [125]. Furthermore, as LDHs can be synthesised with different cations and exchangeable anions, this makes them a very versatile class of materials which can be tailored to deliver a desired anion and capture selective ions from the environment.…”
Section: Ion Exchange Property and Self Protection Of Concretementioning
confidence: 99%
“…Layered double hydroxide (LDH) fillers present a large family of lamellar hydroxides, known as anionic clays [ 19 ]. LDHs are a group of inorganic lamellar compounds in which metal hydroxide layers lie on top of each other, and anions and water molecules are located in the interlayer space [ 20 , 21 ]. The general chemical composition of LDH is [M 2+ 1−x M 3+ x (OH) 2 ] − (A n− ) x/n ·mH 2 O, where M 2+ and M 3+ are divalent and trivalent cations, x is the molar ratio of the trivalent cation, and An − is a charge balancing inter-layer anion [ 22 , 23 ].…”
Section: Introductionmentioning
confidence: 99%