<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Nanosized Mg-Al layered double hydroxides (LDHs) with Cl−, NO3− or SO42− as the interlayer anion have been synthesized by a modified coprecipitation method. The obtained LDHs were confirmed to be composed of a single phase and to be highly substituted by Al (Mg/Al ratio ∼1.9). The abilities of the LDHs to adsorb several harmful anions (F−, CrO42−, HAsO42− and HSeO3−) in aqueous solution were studied. The LDHs exhibit high adsorption abilities. The amount of adsorption onto the LDHs differed between the starting interlayer anions, and decreased in the following order of the interlayer anions: NO3− > Cl− > SO42−. The NO3-formed Mg-Al LDH reached a CrO42− adsorption equilibrium state within only 30 min, much faster than those in previous reports. Thus, the nanocrystallized, highly Al substituted phase of the NO3-formed Mg-Al LDH is found to markedly enhance the anion adsorption ability.</p></abstract>

Nanosized Mg-Al layered double hydroxides (LDHs) with Cl−, NO3− or SO42− as the interlayer anion have been synthesized by a modified coprecipitation method. The obtained LDHs were confirmed to be composed of a single phase and to be highly substituted by Al (Mg/Al ratio ∼1.9). The abilities of the LDHs to adsorb several harmful anions (F−, CrO42−, HAsO42− and HSeO3−) in aqueous solution were studied. The LDHs exhibit high adsorption abilities. The amount of adsorption onto the LDHs differed between the starting interlayer anions, and decreased in the following order of the interlayer anions: NO3− > Cl− > SO42−. The NO3-formed Mg-Al LDH reached a CrO42− adsorption equilibrium state within only 30 min, much faster than those in previous reports. Thus, the nanocrystallized, highly Al substituted phase of the NO3-formed Mg-Al LDH is found to markedly enhance the anion adsorption ability.

Synthesis and adsorption properties of nanosized Mg-Al layered double hydroxides with Cl−, NO3− or SO42− as interlayer anion

Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, 3-3-1 Kichijoji-kitamachi, Musashino, Tokyo, 180-8633, Japan

Department of Resources and Environmental Engineering, School of Creative Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Nanosized Mg-Al layered double hydroxides (LDHs) with Cl−, NO3− or SO42− as the interlayer anion have been synthesized by a modified coprecipitation method....

Synthesis and adsorption properties of nanosized Mg-Al layered double hydroxides with Cl−, NO3− or SO42− as interlayer anion

Published Online: Dec 27, 2011

Page range: 86 - 91

DOI: https://doi.org/10.2478/s13536-011-0024-6

Keywords
layered double hydroxides, nanocrystallizanion, anion adsorption, ion exchange, harmful anions

© 2011 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Synthesis and adsorption properties of nanosized Mg-Al layered double hydroxides with Cl−, NO3− or SO42− as interlayer anion

Published Online: Dec 27, 2011

Page range: 86 - 91

DOI: https://doi.org/10.2478/s13536-011-0024-6

Keywordslayered double hydroxides, nanocrystallizanion, anion adsorption, ion exchange, harmful anions

© 2011 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
layered double hydroxides, nanocrystallizanion, anion adsorption, ion exchange, harmful anions