Kinetics and equilibrium studies on the treatment of nitric acid with Mg-Al oxide obtained by thermal decomposition of NO3--intercalated Mg-Al layered double hydroxide

研究成果: Article査読

13 被引用数 (Scopus)

抄録

Mg-Al oxide obtained by thermal decomposition of NO3--intercalated Mg-Al layered double hydroxide (NO3·Mg-Al LDH) was found to treat HNO3, acting as both a neutralizer and fixative for NO3- The degree of NO3- removal increased with time, Mg-Al oxide quantity, and temperature. The NO3- removal could be represented by a first-order reaction. The apparent activation energy was 52.9kJmol-1, confirming that NO3- removal by Mg-Al oxide proceeded under chemical reaction control. Furthermore, the adsorption of NO3- on Mg-Al oxide could be expressed by a Langmuir-type adsorption isotherm. The maximum adsorption amount and equilibrium adsorption constant were 3.8mmolg-1 and 1.33, respectively. The Gibbs free energy change was -18kJmol-1, confirming that the uptake of NO3- from HNO3 by Mg-Al oxide proceeded spontaneously.

本文言語English
ページ(範囲)497-502
ページ数6
ジャーナルJournal of Colloid And Interface Science
362
2
DOI
出版ステータスPublished - 2011 10 15

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 表面、皮膜および薄膜
  • コロイド化学および表面化学

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