Synthesis and Exfoliation of Co<sup>2+</sup>−Fe<sup>3+</sup> Layered Double Hydroxides:  An Innovative Topochemical Approach

Ma, Renzhi; Liu, Zhaoping; Takada, Kazunori; Iyi, Nobuo; Bando, Yoshio; Sasaki, Takayoshi

doi:10.1021/ja0693035

Cited by 373 publications

(274 citation statements)

References 77 publications

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“…5 and 6) compared to Fe(III), which is dependent on the oxidation of the Ferric ion, Fe 3+ (Eq. 6) (Ma et al 2007). Thus, the oxidation reaction was slightly higher in overall catalytic performance of Fe(III) and Fe(0), which was up to 71.2%, 66.7%, and 42.6%, respectively.…”

Section: Effect Of Delignification In Assisted Fenton Reagentsmentioning

confidence: 99%

Enhanced Delignification of Oil Palm Empty Fruit Bunch Fibers with in situ Fenton-oxidation

Santanaraj¹,

Sajab²,

Mohammad³

et al. 2017

BioResources

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The degradation of lignin in oil palm empty fruit bunch (EFB) fibers by a low concentration of H2O2 was observed with the assistance of Fenton oxidation with Fe(III), Fe(0), and Fe3O4 as a catalyst. To escalate the oxidation activity toward lignin in the EFB fibers, the uptake of the Fenton reagent on the EFB fibers for in situ Fenton oxidation was optimized with fitted Langmuir and Freundlich adsorption models. The efficiency of assisted Fenton reagents was monitored through controlled parameters of H2O2 concentration, retention time, and increment of Fenton reagents. The delignification was observed with up to 71.2% of lignin degradation compared to 47.2% without the use of the Fenton reagents. The characteristics of EFB fibers after the oxidation process were changed based on the observation of morphological and chemical properties. The oxidation concurrently dislodged part of the silica bodies and disrupted specific functional groups and the crystallinity of the EFB fibers.

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Section: Effect Of Delignification In Assisted Fenton Reagentsmentioning

confidence: 99%

Enhanced Delignification of Oil Palm Empty Fruit Bunch Fibers with in situ Fenton-oxidation

Santanaraj¹,

Sajab²,

Mohammad³

et al. 2017

BioResources

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“…Nanosheets can be prepared by exfoliation of layered compounds [12][13][14][15][16][17][18]. For instance, TiO 2-δ -type nanosheets [12], perovskite-type nanosheets [13][14][15] and hydroxide-type nanosheets [16,17] have been reported. The layered compounds prepared by ESD and LBL techniques have been studied in…”

mentioning

confidence: 99%

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets

Ida

Ogata

Matsumoto

2009

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Layered oxides intercalated with Eu3+ ions were prepared by self-assembly deposition method based on the electrostatic interaction between negative charged oxide nanosheets and Eu 3+ ions. The layered oxides were composed of two-dimensional host nanosheet layer with guest Eu 3+ ions and gave Eu 3+ emission based on an energy transfer from bandgap excitation of the host oxide nanosheets to the Eu 3+ ions. The photoluminescence properties of the Eu 3+ ions were influenced by the type of nanosheet and the intercalated water molecules. Relatively-strong emission of Eu 3+ was observed from Eu 3+ -intercalated titanate layered oxide. The intensity of Eu 3+ emission increased with increasing the amount of intercalated water molecules. This indicates that the energy transfer from TiO 2-δ nanosheet to Eu 3+ is promoted by the intercalated water molecules. In addition, the intensity of Eu 3+ emission was stronger at high pH than at low pH. This emission change is presumably due to two phenomena. One is a fine hydration state change of Eu 3+ in the interlayer, and the other is a change in energy transfer from the TiO 2-δ nanosheet to Eu 3+ . IntroductionLayered oxides composed of two-dimensional host oxide layers with guest cations have various interesting properties such as superconducting [1], ferroelectric [2] and photocatalytic properties [3]. These properties strongly depend on the combination between the host layers and the guest cations. Therefore, controlling the combination of layer structure is an important technique for material developing. Generally, two main soft-solution processes are utilized for the preparation of layered structure with desired guest cation into the interlayer. One is the ion-exchange technique carried out in an aqueous solution of a cation of interest, which is substituted for an alkaline cation of the starting layered oxide [4][5][6][7]. The other one is the direct assembly of a host oxide nanosheet and a cation of interest in a solution due to the electrostatic interaction. The latter technique is superior to the former in terms of easy and optimal intercalation of the guest cation. In the latter technique, two methods such as the electrostatic self-assembly deposition (ESD) [8] and layer-by-layer assembly (LBL) techniques [9][10][11] are available to prepare the desired layered oxides. Various kinds of intercalated layered oxides can be easily prepared under controlled pH in a solution by the ESD method, while the LBL method allows us to control the number of layers deposited on a substrate. Nanosheets can be prepared by exfoliation of layered compounds [12][13][14][15][16][17][18]. For instance, TiO 2-δ -type nanosheets [12], perovskite-type nanosheets [13][14][15] and hydroxide-type nanosheets [16,17] have been reported. The layered compounds prepared by ESD and LBL techniques have been studied in

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“…1),2) Since LDHs show anion exchange competence, which has been investigated in detail, 3), 4) their application for the removal of toxic anions (e.g., arsenide ion and fluoride ion) 5), 6) and as drug delivery systems 7) has been investigated. Moreover, LDHs have soft chemical properties such as exfoliation and intercalation, 8), 9) which can result in the formation of a porous structure. 9), 10) In addition, LDHs exhibit a wide variety of chemical compositions and properties because of the combination of diverse metal cations or anions.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, LDHs have soft chemical properties such as exfoliation and intercalation, 8), 9) which can result in the formation of a porous structure. 9), 10) In addition, LDHs exhibit a wide variety of chemical compositions and properties because of the combination of diverse metal cations or anions. In particular, hydroxide layers containing transition metals may exhibit adsorptive or catalytic properties due to the presence of d-electrons.…”

Section: Introductionmentioning

confidence: 99%

Hybridization of Ni–Cr, Cu–Cr, and Zn–Cr layered double hydroxides with polyoxometalates and their catalytic behavior

Mitani

Takei

Yanagida

et al. 2017

J. Ceram. Soc. Japan

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Cr-based layered double hydroxides (LDHs) containing Ni, Zn, or Cu as the divalent cation were prepared with a divalent-totrivalent cation molar ratio of 3. (HWO)) were prepared by ion exchange and hydrothermal processes. The shift of the diffraction line indicating interlayer space in the X-ray diffraction patterns confirmed the intercalation in the LDH. The fraction of PMoO and HWO anions incorporated was 3070 or 6090% of ion exchange capacity, respectively, by charge compensation for Cr 3+ . In the conversion of styrene by epoxidation and oxidation, the hybrid of the LDH composed of Zn and Cr with PMoO showed the maximum catalytic activity, with 70% conversion. For the LDH composed of Ni and Cr, hybridization with a polyanion enhanced the catalytic behavior by a synergistic effect resulting from the basicity of the LDH phase.

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Synthesis and Exfoliation of Co²⁺−Fe³⁺ Layered Double Hydroxides: An Innovative Topochemical Approach

Cited by 373 publications

References 77 publications

Enhanced Delignification of Oil Palm Empty Fruit Bunch Fibers with in situ Fenton-oxidation

Enhanced Delignification of Oil Palm Empty Fruit Bunch Fibers with in situ Fenton-oxidation

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets

Hybridization of Ni–Cr, Cu–Cr, and Zn–Cr layered double hydroxides with polyoxometalates and their catalytic behavior

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Synthesis and Exfoliation of Co2+−Fe3+ Layered Double Hydroxides: An Innovative Topochemical Approach

Cited by 373 publications

References 77 publications

Enhanced Delignification of Oil Palm Empty Fruit Bunch Fibers with in situ Fenton-oxidation

Enhanced Delignification of Oil Palm Empty Fruit Bunch Fibers with in situ Fenton-oxidation

Synthesis and photoluminescence properties of layered oxides intercalated with Eu3+ions by electrostatic self-assembly method using oxide nanosheets

Hybridization of Ni–Cr, Cu–Cr, and Zn–Cr layered double hydroxides with polyoxometalates and their catalytic behavior

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Synthesis and Exfoliation of Co²⁺−Fe³⁺ Layered Double Hydroxides: An Innovative Topochemical Approach

Synthesis and photoluminescence properties of layered oxides intercalated with Eu³⁺ions by electrostatic self-assembly method using oxide nanosheets