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Hierarchical spheres of Mg–Al LDH for the removal of phosphate ions: effect of alumina polymorph as precursor

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Abstract

In order to tailor the morphology of the layered double hydroxide (LDHs) particles, we focused on a synthesis method that involves the use of Al2O3 as a precursor, employing Al2O3 with different crystal structures (e.g., α-Al2O3, θ-Al2O3, and γ-Al2O3) as well as amorphous Al2O3. A three-dimensional network of plate-shaped LDH particles was formed when θ-Al2O3 and γ-Al2O3 were used, even though α-Al2O3 barely reacts to form the LDH phase. Finally, adsorption tests involving HPO42− ions confirmed that the fabricated LDH particles exhibited high ion-removal rates. The LDH particles prepared with θ-Al2O3 and γ-Al2O3 could remove the hydrogen phosphate ions (HPO42−) in a concentration of 0.40 mmol g−1 completely within 10 min; this is approximately 20 times shorter than the time taken by the LDH particles prepared from amorphous Al2O3.

Graphical abstract: Hierarchical spheres of Mg–Al LDH for the removal of phosphate ions: effect of alumina polymorph as precursor

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Publication details

The article was received on 08 Jul 2019, accepted on 03 Oct 2019 and first published on 07 Oct 2019


Article type: Paper
DOI: 10.1039/C9CE01064E
CrystEngComm, 2019, Advance Article

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    Hierarchical spheres of Mg–Al LDH for the removal of phosphate ions: effect of alumina polymorph as precursor

    T. Sudare, A. Zenzai, S. Tamura, M. Kiyama, F. Hayashi and K. Teshima, CrystEngComm, 2019, Advance Article , DOI: 10.1039/C9CE01064E

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