Highly Effective Adsorption of Heavy Metal Ions by a Thiol-Functionalized Magnesium Phyllosilicate Clay
| Autor: | Bryan D. Payne, Molly K. Mitchell, Isabelle L. Lagadic |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Ions
Carbon Isotopes Magnetic Resonance Spectroscopy Spectrophotometry Infrared Magnesium Metal ions in aqueous solution Inorganic chemistry Infrared spectroscopy chemistry.chemical_element General Chemistry Nuclear magnetic resonance spectroscopy Ion Metal Adsorption chemistry Magnesium Silicates Metals Heavy visual_art visual_art.visual_art_medium Environmental Chemistry Moiety Sulfhydryl Compounds Water Pollutants Chemical |
| Zdroj: | Environmental Science & Technology. 35:984-990 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es001526m |
| Popis: | A thiol-functionalized layered magnesium phyllosilicate material (called Mg-MTMS), prepared by a direct and cost-effective co-condensation synthesis, has been investigated as a high-capacity adsorbent for heavy metal ions. Structural characterization by powder X-ray diffraction, infrared spectroscopy, solid-state 13C and 29Si NMR spectroscopies, and elemental analyses confirms the smectite-type structure and the high organic moiety content of this material. Mg-MTMS was found to be highly effective for the adsorption of Hg(II), Pb(II), and Cd(II) ions, exhibiting unprecedented metal ion uptake capacities of 603, 365, and 210 mg of metal/g of adsorbent, respectively. Mg-MTMS shows an equivalent affinity for the three metal ions, removing them from mixed metal solutions with an equal ion uptake capacity (approximately 400 mg of metal/g of adsorbent). Metal-loaded Mg-MTMS can be regenerated by acid treatment without altering the adsorbent properties. The high effectiveness of Mg-MTMS for the capture of metal ions is attributed to both the high concentration of complexing thiol groups (6.4 mmol of SH/g of Mg-MTMS) and the expansion capability of the framework, which facilitates the accessibility of the binding sites. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|