Ion exchange for ZnAl-LDHs using ammonium-salt method in aqueous medium

Dujuan Liang; Zhen Lei; Xuedi Xiang; Xiaojing Yang

Ion exchange for ZnAl-LDHs using ammonium-salt method in aqueous medium

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Author(s): Dujuan Liang¹ ; Zhen Lei¹ ; Xuedi Xiang¹ ; Xiaojing Yang¹
- Affiliations: 1: Beijing Key Laboratory of Energy Conversion and Storage Materials , College of Chemistry, Beijing Normal University , Beijing, 100875 , People's Republic of China
Source: Volume 13, Issue 1, January 2018, p. 104 – 107
DOI: 10.1049/mnl.2017.0155 , Online ISSN 1750-0443

Received 08/03/2017, Accepted 28/07/2017, Revised 05/07/2017, Published 01/01/2018

The intercalated anion species of layered double hydroxides (LDHs) largely determine their application performance. This work investigated the ion exchange process from CO₃ ²⁻- to NO₃ ⁻-type LDHs in aqueous medium using the ammonium salt method, and found that a complete ion exchange reaction can be performed by heat treatment. The weak acidity of aqueous NH₄NO₃ solutions can protonate the interlayered CO₃ ²⁻ to HCO₃ ⁻ and then NO₃ ⁻ intercalates for the charge compensation; heating at temperatures above 80° C enables the double hydrolysis of HCO₃ ⁻ and NH₄ ⁺ to CO₂ and NH₃ gases, which is proposed to be a kinetically indispensable factor to complete the NO₃ ⁻/CO₃ ²⁻ ion exchange. The heating treatment could reduce the salt dosage and greatly shorten the reaction time to 1 h. In the ion exchange process, mass losses of ZnAl-LDHs take place due to the dissolution of hydroxide layers, and the dissolution rate of Zn increases with an increase in the heating time, but Al is hardly dissolved. The present work also demonstrated that the proposed method can be appropriate for a complete ion exchange of SO₄ ²⁻ or I⁻ for CO₃ ²⁻.

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Ion exchange for ZnAl-LDHs using ammonium-salt method in aqueous medium

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