Highly Selective and Efficient Removal of Heavy Metals by Layered Double Hydroxide Intercalated with the MoS Ion.
The MoS ion was intercalated into magnesium-aluminum layered double hydroxide (MgAl--NO-LDH) to produce a single phase material of MgAl(OH)(MoS)·nHO (MgAl--MoS-LDH), which demonstrates highly selective binding and extremely efficient removal of heavy metal ions such as Cu, Pb, Ag, and Hg. The MoS-LD...
| Publicado en: | Journal of the American Chemical Society Vol. 138; no. 8; pp. 2858 - 2867 |
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| Autores principales: | , , , , , |
| Formato: | Artículo |
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American Chemical Society
3/2/2016
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=113856444&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 113856444 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 3/2/2016 vid: 138 iid: 8 pid: 997 pub: American Chemical Society artinfo: ui: 113856444 10.1021/jacs.6b00110 ppf: 2858 ppct: 9 formats: tig: atl: Highly Selective and Efficient Removal of Heavy Metals by Layered Double Hydroxide Intercalated with the MoS Ion. aug: au: Lijiao Ma Qing Wang Islam, Saiful M. Yingchun Liu Shulan Ma Kanatzidis, Mercouri G. affil: Beijing Key Laboratory of Energy Conversion and Storage Materials and College of Chemistry, Beijing Normal University, Beijing 100875, China Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, United States su: Heavy metals Layered double hydroxides Metal ions Langmuir isotherms X-ray diffraction sug: subj: Heavy metals Layered double hydroxides Metal ions Langmuir isotherms X-ray diffraction ab: The MoS ion was intercalated into magnesium-aluminum layered double hydroxide (MgAl--NO-LDH) to produce a single phase material of MgAl(OH)(MoS)·nHO (MgAl--MoS-LDH), which demonstrates highly selective binding and extremely efficient removal of heavy metal ions such as Cu, Pb, Ag, and Hg. The MoS-LDH displays a selectivity order of Co, Ni, Zn < Cd ≪ Pb < Cu < Hg < Ag+ for the metal ions. The enormous capacities for Hg (~500 mg/g) and Ag (450 mg/g) and very high distribution coefficients (K) of ~107 mL/g place the MoS-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 Cu, Pb, Hg, and Ag+ from ppm levels to trace levels of ≤1 ppb. For the highly toxic Hg (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 Cu, Ag+, Pb, and Hg 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 MoS-LDH material retain the original hexagonal prismatic shape and are stable at pH ≈ 2-10. The MoS-LDH material is thus promising for the remediation of heavy metal polluted water. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2016 holdings: @attributes: islocal: N |
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