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- Title
Regeneration of carbonate-intercalated Mg–Al layered double hydroxides (CO3·Mg–Al LDHs) by CO2-induced desorption of anions (X) from X·Mg–Al LDH (X = Cl, SO4, or NO3): A kinetic study.
- Authors
Kameda, Tomohito; Uchida, Hiroki; Kumagai, Shogo; Saito, Yuko; Mizushina, Keiichi; Itou, Ichirou; Han, Tianye; Yoshioka, Toshiaki
- Abstract
• CO 3 ·Mg–Al LDH can be regenerated by treatment of Cl, SO 4 , NO 3 ·Mg–Al LDH with gaseous CO 2. • The desorption of Cl−, SO 4 2−, and NO 3 − follows the intraparticle diffusion model. • This is limited by the step of CO 3 2− diffusion between LDH layers. Carbonate-intercalated Mg–Al layered double hydroxides (CO 3 ·Mg–Al LDHs) are examined as a means of sequestering gaseous pollutants, such as HCl, NO x , and SO x , which are bound to afford X·Mg–Al LDH (X = Cl, SO 4 , or NO 3). In view of the fact that the common regeneration method of CO 3 ·Mg–Al LDH (agitation in aqueous Na 2 CO 3) poses a number of problems, we herein develop a new method of regenerating CO 3 ·Mg–Al LDH by treatment of X·Mg–Al LDH with gaseous CO 2 under neutral or alkaline conditions. The desorption of X is shown to follow the intraparticle diffusion model, featuring the diffusion of CO 3 2− in between LDH layers as the rate-determining step. Given the importance of LDHs for wastewater treatment and gaseous pollutant removal, the obtained results pave the way to the efficient utilization of these adsorbents and contribute to the development of next-generation decontamination techniques.
- Subjects
LAYERED double hydroxides; DESORPTION; CARBON dioxide; WASTEWATER treatment; CARBON dioxide adsorption; ANIONS
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2021, Vol 165, p207
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2020.10.032