Adsorption of metal and uranyl ions onto amidoximated Pinus densiflora bark
| Autor: | Sung Phil Mun, Chang Sub Ku, Jae Phil Kim |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
biology
Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element Forestry Plant Science biology.organism_classification Uranyl Copper Industrial and Manufacturing Engineering Metal chemistry.chemical_compound Hydrolysis Adsorption Pinus densiflora chemistry visual_art visual_art.visual_art_medium General Materials Science Acrylonitrile |
| Zdroj: | Wood Science and Technology. 44:283-299 |
| ISSN: | 1432-5225 0043-7719 |
| DOI: | 10.1007/s00226-009-0276-z |
| Popis: | Pine (Pinus densiflora) bark was chemically modified by grafting with acrylonitrile (AN) through Fenton reaction and conversion of the cyano group to an amidoxime group by reaction with hydroxylamine. Treatments of pine bark with 160 mM H2O2 at 40°C yielded ~70% grafting in 6-h reaction. After alkali hydrolysis of amidoximated pine bark (AOPB), its adsorption capacity (q e) for copper ions was largely increased from 0.5 to 1.8 mmol/g. Adsorption of the hydrolyzed AOPB (HAOPB) followed the pseudo-second-order kinetic model. Among the metal ions tested, the order of adsorption capacity (q e) predicted by the kinetic model at equilibrium time was Hg2+ > UO2 2+ > Cd2+ > Cu2+ > Zn2+ > Ni2+. The adsorption process was pH-dependent, and the adsorption equilibrium was observed in the pH range of 6–7 for all the metal ions. Even though pine bark is a good adsorbent for Hg2+ and UO2 2+ ions, it had a poor affinity for the other ions tested. It was obviously found that HAOPB had very high adsorption abilities for heavy metal and uranyl ions. |
| Databáze: | OpenAIRE |
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