Highly Selective and Efficient Removal of Heavy Metals by Layered Double Hydroxide Intercalated with the MoS4 2- Ion

Lijiao Ma, Qing Wang, Saiful M. Islam, Yingchun Liu, Shulan Ma, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

180 Citations (Scopus)

Abstract

The MoS4 2- ion was intercalated into magnesium-aluminum layered double hydroxide (MgAl - NO3-LDH) to produce a single phase material of Mg0.66Al0.34(OH)2(MoS4)0.17·nH2O (MgAl - MoS4-LDH), which demonstrates highly selective binding and extremely efficient removal of heavy metal ions such as Cu2+, Pb2+, Ag+, and Hg2+. The MoS4-LDH displays a selectivity order of Co2+, Ni2+, Zn2+ <Cd2+ 蠐 Pb2+ <Cu2+ <Hg2+ <Ag+ for the metal ions. The enormous capacities for Hg2+ (∼500 mg/g) and Ag+ (450 mg/g) and very high distribution coefficients (Kd) of ∼107 mL/g place the MoS4-LDH at the top of materials known for such removal. Sorption isotherm for Ag+ agrees with the Langmuir model suggesting a monolayer adsorption. It can rapidly lower the concentrations of Cu2+, Pb2+, Hg2+, and Ag+ from ppm levels to trace levels of ≤1 ppb. For the highly toxic Hg2+ (at ∼30 ppm concentration), the adsorption is exceptionally rapid and highly selective, showing a 97.3% removal within 5 min, 99.7% removal within 30 min, and ∼100% removal within 1 h. The sorption kinetics for Cu2+, Ag+, Pb2+, and Hg2+ follows a pseudo-second-order model suggesting a chemisorption with the adsorption mechanism via M - S bonding. X-ray diffraction patterns of the samples after adsorption demonstrate the coordination and intercalation structures depending on the metal ions and their concentration. After the capture of heavy metals, the crystallites of the MoS4-LDH material retain the original hexagonal prismatic shape and are stable at pH ≈ 2-10. The MoS4-LDH material is thus promising for the remediation of heavy metal polluted water.

Original languageEnglish
Pages (from-to)2858-2866
Number of pages9
JournalJournal of the American Chemical Society
Volume138
Issue number8
DOIs
Publication statusPublished - Mar 2 2016

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Heavy Metals
Heavy metals
Adsorption
Ions
Metal ions
Metals
Sorption
Heavy Ions
Poisons
Aluminum
X-Ray Diffraction
Magnesium
Intercalation
Chemisorption
Remediation
Heavy ions
Crystallites
Diffraction patterns
Isotherms
Monolayers

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Highly Selective and Efficient Removal of Heavy Metals by Layered Double Hydroxide Intercalated with the MoS4 2- Ion. / Ma, Lijiao; Wang, Qing; Islam, Saiful M.; Liu, Yingchun; Ma, Shulan; Kanatzidis, Mercouri G.

In: Journal of the American Chemical Society, Vol. 138, No. 8, 02.03.2016, p. 2858-2866.

Research output: Contribution to journalArticle

Ma, Lijiao ; Wang, Qing ; Islam, Saiful M. ; Liu, Yingchun ; Ma, Shulan ; Kanatzidis, Mercouri G. / Highly Selective and Efficient Removal of Heavy Metals by Layered Double Hydroxide Intercalated with the MoS4 2- Ion. In: Journal of the American Chemical Society. 2016 ; Vol. 138, No. 8. pp. 2858-2866.
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