Layered double hydroxide (LDH)-based monolith with interconnected hierarchical channels: enhanced sorption affinity for anionic species

Tokudome, Yasuaki; Tarutani, Naoki; Nakanishi, Koji; Takahashi, Masahide

doi:10.1039/c3ta11110e

Cited by 60 publications

(53 citation statements)

References 43 publications

(50 reference statements)

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“…It is interesting to evaluate the probability of LDH/SF nanocomposites used as sorbents for efficient removal of heavy‐metal ions from wastewater. Further, the monolithic shape of the nanocomposites might enable them to be handled more easily than powdery LDH sorbents …”

Section: Introductionmentioning

confidence: 99%

Fabrication of Layered Double Hydroxide/Silica Foam Nanocomposites and Their Application for Removing Pb(II) and Cr(VI) from Aqueous Solutions

et al. 2019

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In the current work, nanocomposites of Mg−Al and Mg−Fe layered double hydroxides (LDHs) anchored on silica foam (SF), denoted as MAL/SF and MFL/SF, respectively, were fabricated using a two‐step route. The obtained LDHs/SF nanocomposites were characterized by XRD, TEM, SEM, EDS, elemental mapping, and N2 adsorption‐desorption techniques. Sorption of the heavy‐metal Pb(II) and Cr(VI) on the LDHs/SF was determined at 25 °C and pH 5.5 using a batch technique. In comparison with bulk Mg−Al and Mg−Fe LDHs, the LDHs in the MAL/SF and MFL/SF exhibit significantly enhanced sorption capacities. In addition, the LDHs/SF nanocomposites show a good recyclability for removing heavy metals. The construction of LDHs/SF nanocomposites is an effective strategy for improving the sorption capacity of LDHs, and the nanocomposites are potential sorbents for wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Fabrication of Layered Double Hydroxide/Silica Foam Nanocomposites and Their Application for Removing Pb(II) and Cr(VI) from Aqueous Solutions

et al. 2019

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“…On the basis of this method, single‐component metal hydroxide nanoparticles composed of various metal cations and Ni‐Al LDH nanoparticles have been prepared. However, if this method is applied to the preparation of Mg‐Al LDH nanoparticles, Al(OH) 3 may be produced as an impurity as a result of the gradual increase in pH . To the best of our knowledge, the possibility of applying this method for the synthesis of Mg‐Al LDH nanoparticles has not been mentioned.…”

Section: Introductionmentioning

confidence: 99%

“…However, if this method is applied to thep reparation of Mg-Al LDH nanoparticles, Al(OH) 3 may be produced as an impurity as ar esult of the graduali ncrease in pH. [18] To the best of our knowledge, the possibility of applyingt his methodf or the synthesis of Mg-AlL DH nanoparticles hasn ot been mentioned.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles

Kuroda

Matsuno

Kamata

et al. 2017

Chemistry A European J

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Mesoporous basic Mg-Al mixed metal oxides (MMOs) with a high surface area and large pore size have been prepared through the assembly of monodispersed layered double hydroxide nanoparticles (LDHNPs) with block copolymer templates. The particle sizes of the LDHNPs were mainly controlled by varying the concentration of tris(hydroxymethyl)aminomethane (THAM), which was used as a surface stabilizing agent. LDHNPs and micelles of a block copolymer (Pluronic F127) were assembled to form a composite. The composites were calcined to transform them into mesoporous MMOs and to remove the templates. The Brunauer-Emmett-Teller surface areas, mesopore sizes, and pore volumes increased as a result of using the templates. Moreover, the pore sizes of the mesoporous MMOs could be controlled by using LDHNPs of different sizes. The mesoporous MMOs prepared from the LDHNPs showed much higher catalytic activity than a conventional MMO catalyst for the Knövenagel condensation of ethyl cyanoacetate with benzaldehyde. The mesoporous MMO catalyst prepared using the smallest LDHNPs, about 12 nm in size, showed the highest activity. Therefore, the use of monodispersed LDHNPs and templates is effective for preparing highly active mesoporous solid base catalysts.

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“…7) The metal hydroxide materials overviewed in the previous sections possess specific macro and meso structures, and thereby, exhibit characteristic chemical/physical properties. The author and co-authors have reported the enhancement of dye adsorption 35) and protein adsorption 53) on hierarchically porous MgAl LDH. In the case of dye adsorption (Rhodamine B and Pyranine), larger macropores resulted in faster adsorption on LDH.…”

Section: Applications Of Metal Hydroxides With Controllable Nano/macrmentioning

confidence: 99%

“…35) Monolithic LDH materials with hierarchical pores in¯m and nm ranges were obtained via an aqueous one-pot reaction at as low as 40°C. The pore sizes in discrete size scales were independently tunable by synthetic parameters, allowing the enhancement of the rate of adsorption and the capacity of guest molecules.…”

Section: Jcs-japanmentioning

confidence: 99%

Aqueous synthesis of metal hydroxides with controllable nano/macro architectures

Tokudome

2017

J. Ceram. Soc. Japan

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This review briefly describes recent advances on the synthesis of metal hydroxide nanomaterials and their assembly into 3D architectures toward applications of catalysis, adsorption, and energy conversion. The discussion is mainly dedicated to the synthesis strategies toward nanohydroxide-based functional materials. A special attention is focused on two reaction schemes for the preparations of: (1) macroporous (hydr)oxides monoliths and (2) monodispersed hydroxide nanoclusters and mesoporous hydroxides.

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Layered double hydroxide (LDH)-based monolith with interconnected hierarchical channels: enhanced sorption affinity for anionic species

Cited by 60 publications

References 43 publications

Fabrication of Layered Double Hydroxide/Silica Foam Nanocomposites and Their Application for Removing Pb(II) and Cr(VI) from Aqueous Solutions

Fabrication of Layered Double Hydroxide/Silica Foam Nanocomposites and Their Application for Removing Pb(II) and Cr(VI) from Aqueous Solutions

Preparation of Mesoporous Basic Oxides through Assembly of Monodispersed Mg–Al Layered Double Hydroxide Nanoparticles

Aqueous synthesis of metal hydroxides with controllable nano/macro architectures

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