Mg−Al layered double hydroxide intercalated with CO3 2– and its recyclability for treatment of SO2

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5 Citations (Scopus)

Abstract

Mg − Al layered double hydroxide intercalated with CO3 2– (CO3·Mg − Al LDH) was successfully used to remove SO2 from a gas mixture at 140, 170, and 200 °C. The removal of SO2 with CO3·Mg − Al LDH occurred via surface adsorption of SO2 and anion exchange between CO3 2– in the interlayer of Mg − Al LDH and SO2 from the gas mixture. The removal of SO2 followed the order of Ca(OH)2 > CO3·Mg − Al LDH (Mg/Al = 2) > CO3·Mg − Al LDH (Mg/Al = 4). The removal of SO2 also followed the order of CO3·Mg − Al LDH > Mg(OH)2 > SO4·Mg − Al LDH. CO3·Mg − Al LDH was regenerated from SO4·Mg-Al LDH using a Na2CO3 solution through anion exchange between SO4 2− and CO3 2−, leading to its recyclability for removal of SO2 from a gas mixture three times, demonstrating the feasibility of recycling the material.

Original languageEnglish
Article number105349
JournalApplied Clay Science
Volume183
DOIs
Publication statusPublished - 2019 Dec 15

Keywords

  • CO·Mg − Al layered double hydroxide
  • Recycling
  • SO

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

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