Adsorption of divalent transition metal ions with a chelating agent on octadecyl silica gel.
This investigation looked at the extraction ability of divalent transition metal ions onto an octadecyl silica gel (C18g) with a 4,4-trifluoro-1-(2-thienyl)-1,3-butadione (TTA) chelating agent. A method of retaining TTA onto C18g (TTA-C18g) was developed in order to adsorb the metal ions. The difference in the half-adsorption and half-extraction pH values between transition metals Ni2+-Co2+ was found to be 0.7 in this system. This is better than previously published results of 0.3 for the conventional extraction method using TTA in nitrobenzene. More than 96% of the metal ions in aqueous solution could be adsorbed onto TTA-C18g. Our system, which has no organic phase, can achieve a better removal or separation of transition metal ions than the conventional solvent-extraction methods using TTA in toluene or nitrobenzene.
Iiyama
Masamitsu
M
Department of Environmental Chemistry, College of Environmental Engineering and Architecture, Kanazawa Institute of Technology, 7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan. m.iiyama@venus.kanazawa-it.ac.jp
Oshima
Syunichi
S
Kokusen
Hisao
H
Sekita
Masami
M
Tsurubou
Shigekazu
S
Komatsu
Yu
Y
D000327:Adsorption; D002413:Cations, Divalent / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry*; D006841:Hydrocarbons, Aromatic / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry*; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry*
D002413:Cations, Divalent; D002614:Chelating Agents; D006841:Hydrocarbons, Aromatic; D008670:Metals; D058428:Silica Gel; D012822:Silicon Dioxide