Treatment of waste H 2SO 4 with Mg-Al oxide obtained by calcination of NO 3 -intercalated Mg-Al layered double hydroxide: Kinetics and equilibrium

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Abstract

Mg-Al oxide obtained by calcination of NO 3 -- intercalated Mg-Al layered double hydroxide (NO 3̇Mg-Al LDH) was used to treat H 2SO 4, acting as both a neutralizer of the acid and a fixative for SO 4 2-. The fraction of SO 4 2- removed increased with time and with increasing Mg-Al oxide quantity and temperature. The rate of SO 4 2- removal followed first-order kinetics with apparent rate constants of 2.0 × 10 -3, 4.4 × 10 -3, and 5.3 × 10 -2 min -1 at 10, 30, and 60°C, respectively. The apparent activation energy was 52.1 kJ mol -1, confirming that the SO 4 2- removal by Mg-Al oxide proceeded under chemical reaction control. Furthermore, the adsorption isotherm of SO 4 2- by Mg-Al oxide obeyed the Langmuir equation. The maximum adsorption amount was 2.0 mmol g -1, or 4.0 meq g -1, indicating that Mg-Al oxide has a large capacity for uptake of SO 4 2- from H 2SO 4.

Original languageEnglish
Pages (from-to)711-717
Number of pages7
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Volume47
Issue number5
DOIs
Publication statusPublished - 2012 Apr 1

Keywords

  • H SO
  • Mg-Al oxide
  • NO intercalated Mg-Al layered double hydroxide
  • equilibrium
  • kinetics
  • treatment

ASJC Scopus subject areas

  • Environmental Engineering

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