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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)497-502
Number of pages6
JournalJournal of Colloid And Interface Science
Volume362
Issue number2
DOIs
Publication statusPublished - 2011 Oct 15

Keywords

  • Equilibrium
  • Kinetics
  • Mg-Al oxide
  • NO-intercalated Mg-Al layered double hydroxide
  • Nitric acid
  • Treatment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Kinetics and equilibrium studies on the treatment of nitric acid with Mg-Al oxide obtained by thermal decomposition of NO<sub>3</sub><sup>-</sup>-intercalated Mg-Al layered double hydroxide'. Together they form a unique fingerprint.

  • Cite this