Effect of structure of chelate junction of divalent copper complexes on their inhibiting activation in oxidation processes

Author(s):  
V. G. Vinogradova ◽  
N. K. Kul'kova ◽  
Z. K. Maizus ◽  
N. M. Emanuel
1999 ◽  
Vol 38 (19) ◽  
pp. 4203-4210 ◽  
Author(s):  
Pierre-Louis Vidal ◽  
Bernadette Divisia-Blohorn ◽  
Gérard Bidan ◽  
Jean-Marc Kern ◽  
Jean-Pierre Sauvage ◽  
...  

2017 ◽  
Vol 147 ◽  
pp. 100-106 ◽  
Author(s):  
Nathan A. Gordon ◽  
Kelly L. McGuire ◽  
Spencer K. Wallentine ◽  
Gregory A. Mohl ◽  
Jonathan D. Lynch ◽  
...  

Holzforschung ◽  
2012 ◽  
Vol 66 (3) ◽  
Author(s):  
Sedric Pankras ◽  
Paul A. Cooper

Abstract The effects of ammonia (NH3) addition to monoethanolamine (Mea)-based alkaline copper quaternary (ACQ) on the predicted distribution of cupric (Cu2+) species in solution and copper leaching from treated wood were investigated. Addition of ammonia in higher proportions reduced the amount of neutral copper-Mea complex at high pH and increased the amounts of divalent copper-NH3 complexes. At lower pH, the amounts of high-ligand copper-Mea complexes were reduced. These effects should promote better fixation and diminish copper leaching. However, ammonia addition also reduced the monovalent copper-Mea complex and the amount of copper fixed by precipitation at lower pH. This effect could, potentially, reduce fixation and leach resistance. Ammonia addition to the ACQ formulation from a Cu:Mea:NH3 ratio of 1:4:0 (normal Mea formulation, pH=9) to 1:4:2 (pH 10–10.2) and 1:4:4 (pH 10.4–10.5) did not significantly affect the amount of copper leached. However, a further increase in ammonia to 1:4:6 (pH 10.6–10.7) resulted in a significant reduction in copper leaching. At pH 9, an increase in the proportional amount of ammonia increased the amount of copper leached by reducing the amount of monovalent copper-Mea complex and increasing the divalent copper-NH3 complexes. Ammonia addition with a lower amount of Mea, 1:2.5:4 formulation (pH 10.5–10.7), significantly reduced copper leaching as a result of higher amounts of divalent copper-NH3 complexes adsorbed at higher pH (higher cation exchange capacity) without compromising the amount of copper precipitated at lower pH.


2016 ◽  
Vol 110 (3) ◽  
pp. 445a
Author(s):  
Kelly L. McGuire ◽  
Spencer Wallentine ◽  
Nathan A. Gordon ◽  
Greg Mohl ◽  
Mckay D. Jensen ◽  
...  

1997 ◽  
Vol 94 ◽  
pp. 1695-1714 ◽  
Author(s):  
P Lesot ◽  
F Perez ◽  
P Judeinstein ◽  
JP Bayle ◽  
H Allouchi ◽  
...  

2018 ◽  
Vol 4 (4) ◽  
pp. 52-63
Author(s):  
V. Yu. Shumskaya ◽  
S. F. Zhandarov ◽  
L. A. Kalinin ◽  
L. F. Ivanov ◽  
V. V. Snezhkov ◽  
...  

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