Fabrication of hierarchically porous monolithic layered double hydroxide composites with tunable microcages for effective oxyanion adsorption

RSC Advances Volume 5 Page 57187-57192 published_at 2015-06-23
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Title ( eng )
Fabrication of hierarchically porous monolithic layered double hydroxide composites with tunable microcages for effective oxyanion adsorption
Creator
Tokudome Yasuaki
Fukui Megu
Nakanishi Kazuki
Takahashi Masahide
Source Title
RSC Advances
Volume 5
Start Page 57187
End Page 57192
Abstract
Removal of toxic substances from industrial wastes is an urgent issue for realizing a sustainable society. Layered double hydroxides (LDHs) are expected to be an effective adsorbent for toxic anions, especially oxyanions, because of their high anion adsorption capacity and reusability. Monolithic LDH materials with rational meso- and macropores are expected to show high adsorption capacity/rate towards targeted toxic substances owing to their large specific surface area and liquid transport property. Besides fabricating hierarchical pores, size control of microcages in LDH crystals is required to achieve selective removal of oxyanions. Herein, we prepared hierarchically porous monolithic LDH composites with tunable microcages by changing the combination of cationic species in the LDH crystal. Monolithic Mg-, Mn-, Fe-, Co- and Ni-Al type LDH composites with hierarchical pores were successfully prepared via an epoxide-mediated sol-gel reaction accompanying with phase separation. The monolithic Co-Al type LDH composite with hierarchical pores exhibited the highest CrO42− adsorption capacity because its microcage size well fits the CrO42− size. Also Co-Al type LDH composite adsorbed different oxyanions, depending on their affinity with the LDH, in SO42−, CrO42−, MoO42− and HVO42− co-existing solution. The pore size controllability in discrete length-scales of micrometers, nanometers, and picometers offers LDHs with tailored surface chemistries and physical properties desirable for effective and selective oxyanion adsorption.
Descriptions
The study was supported by JSPS KAKENHI (No. 26288108, 26630322).
This work is partially supported by the Kazuchika Okura Memorial Foundation and the Hosokawa Powder Technology Foundation.
Language
eng
Resource Type journal article
Publisher
Royal Society of Chemistry
Date of Issued 2015-06-23
Rights
This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。
Publish Type Author’s Original
Access Rights open access
Source Identifier
[ISSN] 2046-2069
[DOI] 10.1039/C5RA05942A
[DOI] https://doi.org/10.1039/C5RA05942A