Synthesis of a novel layered double hydroxides [MgAl4(OH)12](Cl)2·2.4H2O and its anion-exchange properties

Chitrakar, Ramesh; Makita, Yoji; Sonoda, Akinari; Hirotsu, Takahiro

doi:10.1016/j.jhazmat.2010.10.066

Cited by 40 publications

(31 citation statements)

References 22 publications

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“…The coprecipitated LDHs with organic anions were analyzed by XRD (Figure 3). The patterns of the Asp, PP, Adip, and DDS derivatives presented basal spaces of 12.5, 15.0, 14.5, and 29.2Å, respectively, in agreement with the intercalation of a single organic layer in the interlayer space of the LDH structure [19,20,22,24,25]. The Ser coprecipitation product did not produce an intercalated compound since the basal space of 8.3Å corresponded to the 30 : 0 : 10 LDH intercalated with nitrate ions, which is plotted in Figure 1; however, the surface adsorption of this amino acid was evidenced by FTIR spectroscopy.…”

Section: Intercalation In Dysprosium-doped Ldhsupporting

confidence: 72%

Phosphor Dysprosium‐Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups

Vargas

Oviedo

Lisboa

et al. 2013

Journal of Nanomaterials

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The layers of a Zn/Al layered double hydroxide (LDH) were doped with Dy3+cations. Among some compositions, the Zn2+ : Al3+ : Dy3+molar ratio equal to 30 : 9 : 1 presented a single crystalline phase. Organic anions with carboxylic, amino, sulfate, or phosphate functional groups were intercalated as single layers between LDH layers as confirmed by X-ray diffraction and infrared spectroscopy. Photoluminescence spectra of the nitrate intercalated LDH showed a wide emission band with strong intensity in the yellow region (around 574 nm), originated due to symmetry distortion of the octahedral coordination in dysprosium centers. Moreover, a broad red band emission was also detected apparently due to the presence of zinc oxide. The distorted symmetry of the dysprosium coordination environment, also confirmed by X-ray photoelectron spectroscopy analysis, was modified after the intercalation with phenyl phosphonate (PP), aspartate (Asp), adipate (Adip), and serinate (Ser) anions; the emission as measured from PL spectra of these LDH was more intense in the blue region (ca. 486 nm), thus indicating an increase in symmetry of dysprosium octahedrons. The red emission band from zinc oxide kept the same intensity after intercalation of dodecyl sulfate (DDS). An additional emission of unknown origin atλ= 767 nm was present in all LDHs.

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Section: Intercalation In Dysprosium-doped Ldhsupporting

confidence: 72%

Phosphor Dysprosium‐Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups

Vargas

Oviedo

Lisboa

et al. 2013

Journal of Nanomaterials

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“…Layered double hydroxides (LDHs)는 층상구조 를 가지고 있는 점토성 물질로서 음으로 하전된 inter layer와 양으로 하전된 main layer로 구성되어 있다 (Dadwhal et al, 2009;Duan et al, 2005;Hibino et al, 2009). LDHs 물질은 main layer의 2가 금속이온 중 일부가 3가 금속으로 치환되며 발 생한 전하 불균형에 의해 음이온이 inter layer로 층 간 삽입됨으로써 형성된다 (Rhee et al, 1995 (Cavani et al, 1991;Chitrakar et al, 2011 (Rhee et al, 1995;Woo et al, 2010;Hibino et al, 2009). Mg‧Al-LDH (Dadwhal et al, 2009;Yang et al, 2005), Mg‧ Fe-LDH (Carja et al, 2008;Türk et al, 2009 (Dadwhal et al, 2009;Yang et al, 2005;Carja et al, 2008 (Christensen et al, 2004;Matschei et al, 2007), 특히 AFm phase의 이온교환능은 AFt phase보다 높은 것으로 알려져 있다 (Glasser et al, 1999 (Mosalamy et al, 1984;Clark and Brown, 1999;Christensen et al, 2004 Baur et al, 2004;Matschei et al, 2007;Mineni et al, 1997).…”

Section: 서 론unclassified

The investigation of As(V) removal mechanism using monosulfate ((Ca₄Al₂O₆(SO₄)·12H₂O) and its characteristics

Kim¹,

Shim²,

Choi³

et al. 2012

Journal of Korean Society of Water and Wastewater

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Experiments for As(V) removal using synthesized Ca‧Al-monosulfate was performed from the water contaminated with arsenate.Monosulfate is known as LDHs (Layered Double Hydroxides) which is one of the anionic clay minerals.Monosulfate was synthesized mixing C3A (tricalcium aluminate), gypsum (calcium sulfate), and water with an intercalation method. The product form the synthesis was characterized by FE-SEM, WDXRF, PXRD, and FT-IR. Experiments with different doses of monosulfate were carried out for kinetic. As a result of experiment, the concentration of As(V) was reduced from 0.67 mM to 0.19 mM (0.67mM of monosulfate) and 0.178 mM (1.34 mM of monosulfate). The concentration of sulfate was increased with As(V) decrease. The result of PXRD showed that the d-spacing of inter layer (d003 peak) was shifted from 8.927 Å to 8.095 Å because the sulfate in the inter layer of monosulfate was exchanged arsenate with water molecules bonded. From the FT-IR results, a new single band (800 cm-1)was observed after the reaction of monosulfate and As(V). The arsenic removal can be regarded as anion exchange mechanism that is one of the characteristics of LDHs from the results of PXRD and FT-IR analysis.

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“…"A" represents the n-valent anions. The LDH structure is organized when M 2+ is substituted by M 3+ and A n− anions are used to balance the net positive charge [25][26][27][28], and the molar ratio of M 3+ /(M 2+ + M 3+ ) range from 0.20 to 0.33 [29,30]. Due to the anion exchange capability of LDHs, various anions can be successfully incorporated inside the LDH interlayer to modify the chemistry of LDH for specific applications: for instance, supercapacitors, environmental sciences, catalysts, adsorption, etc.…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxide Protective Films Developed on Aluminum and Aluminum Alloys: Synthetic Methods and Anti-Corrosion Mechanisms

et al. 2020

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This work reviews the characteristics of layered double hydroxides (LDHs) in the context of protective thin films to enhance the corrosion resistance properties of aluminum alloys. A discussion is made in detail about the LDH protection mechanism and the effect of synthesis approaches on LDH structural variations and the corresponding anti-corrosion behavior. LDHs anion-exchange behavior to host inorganic/organic anions makes them a potential material to investigate for anti-corrosion film. This unique advantage and the availability of a wide range of metal oxide-based layers, interlayer anions, and self-healing properties make LDH family an attractive choice for the development of compact LDHs based smart coating systems.

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Synthesis of a novel layered double hydroxides [MgAl4(OH)12](Cl)2·2.4H2O and its anion-exchange properties

Cited by 40 publications

References 22 publications

Phosphor Dysprosium‐Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups

Phosphor Dysprosium‐Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups

The investigation of As(V) removal mechanism using monosulfate ((Ca₄Al₂O₆(SO₄)·12H₂O) and its characteristics

Layered Double Hydroxide Protective Films Developed on Aluminum and Aluminum Alloys: Synthetic Methods and Anti-Corrosion Mechanisms

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Synthesis of a novel layered double hydroxides [MgAl4(OH)12](Cl)2·2.4H2O and its anion-exchange properties

Cited by 40 publications

References 22 publications

Phosphor Dysprosium‐Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups

Phosphor Dysprosium‐Doped Layered Double Hydroxides Exchanged with Different Organic Functional Groups

The investigation of As(V) removal mechanism using monosulfate ((Ca4Al2O6(SO4)·12H2O) and its characteristics

Layered Double Hydroxide Protective Films Developed on Aluminum and Aluminum Alloys: Synthetic Methods and Anti-Corrosion Mechanisms

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The investigation of As(V) removal mechanism using monosulfate ((Ca₄Al₂O₆(SO₄)·12H₂O) and its characteristics