Novel M (Mg/Ni/Cu)-Al-CO 3 layered double hydroxides synthesized by aqueous miscible organic solvent treatment (AMOST) method for CO 2 capture

Shanshan Shang, Aamir Hanif, Mingzhe Sun, Yuanmeng Tian, Yong Sik Ok, Iris K.M. Yu, Daniel C.W. Tsang, Qinfen Gu, Jin Shang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Layered double hydroxides (LDHs) have been intensively studied in recent years owing to their great potential in CO 2 capture. However, the severe aggregation between platelets and low surface area restricted it from exhibiting very high CO 2 adsorption capacity and CO 2 /N 2 selectivity. In this research, we for the first time synthesized Ni-Al-CO 3 and Cu-Al-CO 3 LDHs using aqueous miscible organic solvent treatment (AMOST) method. The as-synthesized materials were evaluated for CO 2 adsorption at three different temperatures (50, 80, 120 °C) applicable to post-combustion CO 2 capture. Characterized with XRD, N 2 adsorption-desorption, TEM, EDX, and TGA, we found the newly synthesized Ni-Al-CO 3 LDH showed a nano-flower-like morphology comprising randomly oriented 2D nanoplatelets with both high surface area (249.45 m 2 /g) and pore volume (0.59 cc/g). Experimental results demonstrated that un-calcined Ni-Al-CO 3 LDH is superior in terms of CO 2 capture among the three LDHs, with a maximum CO 2 adsorption capacity of 0.87 mmol/g and the ideal CO 2 /N 2 selectivity of 166 at 50 °C under 1200 mbar for typical flue gas CO 2 /N 2 composition (CO 2 :N 2 = 15:85, v/v). This is the first report of a delaminated Ni-Al-CO 3 LDH showing better CO 2 capture performance than the well-reported optimal Mg layered double hydroxide.

Original languageEnglish
Pages (from-to)285-293
Number of pages9
JournalJournal of Hazardous Materials
Volume373
DOIs
Publication statusPublished - 2019 Jul 5

Keywords

  • CO capture
  • CO /N selectivity
  • Layered double hydroxide
  • Ni-Al-CO

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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