Development of Hybrid Electrochemical Treatment for Persistent Metal Complex
We established the method to make persistent metal complexes harmless by using characteristics of diamond: lower surface adsorption property
and the capability to utilize OH radical. By applying potentials
cyclically to persistent metal complexes (Ethylenediaminetetraacetic acid-Cu
complex),
metal (Cu) ions of the complex can be reduced and recycled at negative potential, and the organic ligand can be oxidized and totally decomposed
with OH radical generating on diamond surface at positive potential.
The reduced and recovered metal ions formed metal nanoparticles on diamond
surface
and disperse in the solution. They can be collected as Cu nanoparticles using a filter.
Treatments of various metal complexes can be achieved by selecting
termination structure that accelerates detachment of metal nanoparticles
and potentials that can totally decompose ligand, depending on metal
ions of complexes.
References
1) Y. Yamaguchi, Y. Yamanaka, M. Miyamoto, A. Fujishima, K. Honda, J. Electrochem.
Soc., 153 (12), J123-J132 (2006).
“Hybrid Electrochemical Treatment for Persistent Metal Complex
at Boron-doped Diamond Electrodes and Clarification of its Reaction Route”
Patent
1) JP,4565182,B
[Japanese Patent Publication number] JP 2006 - 88011A (P2006-88011A)
[Application No.] 2004-275371 (P2004-275371)
[Inventor] Kensuke Honda, Hironori Nishino, Yoko Yamaguchi
[Title of the invention] Method of decomposing hardly decomposable
organic metal complexes
[Applicant] Yamaguchi University
[Date of filing] 22, September, 2004
