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Intercalation chemistry and thermal characteristics of layered double hydroxides possessing organic phosphonates and sulfonates

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Abstract

Intercalation of 2-hydroxyethanesulfonate (2-heS) and 3-hydroxy-1-propanesulfonate (3-hpS) into layered Mg–Al double hydroxides (Mg–Al LDHs) allows delamination of layers in water and enables the synthesis of high-surface-area oxides through non-oxidative thermal decomposition. To investigate the roles of anionic heads and hydroxyl tails in these organic sulfonates, 2-hydroxyethanephosphonate (2-heP) and 1,3-propanedisulfonate (1,3-pDS) were tested as analogs of hydroxyalkylsulfonates, and the thermal characteristics of the resultant LDHs were investigated. Exchange of interlayer CO32− with 2-heP proceeds similarly to 2-heS, causing the same degree of interlayer expansion. However, the resultant LDH resists swelling and delamination in water, demonstrating the distinct property enabled by the –SO3 group. Although LDH possessing 1,3-pDS intercalants seems to resist delamination because of the lack of hydroxyl groups, its thermal characteristics resemble those of its 3-hpS counterpart, demonstrating the crucial role of alkyl sulfonate groups to allow the formation of enhanced microporous structures through non-oxidative thermal treatments. Our results show further that even a partial exchange of CO32− by 3-hpS, corresponding to 0.05 equivalents relative to the exchangeable Al sites, triggers unique thermal characteristics observed for LDH-sulfonates.

Graphical abstract: Intercalation chemistry and thermal characteristics of layered double hydroxides possessing organic phosphonates and sulfonates

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Supplementary files

Article information


Submitted
29 Dec 2019
Accepted
03 Mar 2020
First published
04 Mar 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Intercalation chemistry and thermal characteristics of layered double hydroxides possessing organic phosphonates and sulfonates

I. Ogino, Y. Hirayama and S. R. Mukai, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ06441A

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