Roy Gilles, de Donato Philippe, Görner Tatiana, Barres Odile
Laboratoire Environnement et Minéralurgie, UMR 7569 du CNRS-INPL, 15, av. du Charmois, Vandoeuvre-lès-Nancy F-54501, France.
Water Res. 2003 Dec;37(20):4954-64. doi: 10.1016/S0043-1354(03)00438-X.
The degradation of tropaeolin by iron was studied under oxidizing and inert atmospheres. The products were identified by various chromatographic and spectroscopic methods. Under inert atmosphere, the proposed model of mechanism is based on the adsorption of tropaeolin by the sulfonate function on the solid iron, followed by a reduction of the [bond]Nz[double bond]N[bond] bond with formation of 1-amino-2-naphthol and sulfanilic acid. These two intermediaries were reduced to 1,2-dihydroxynaphthalene and benzene with NH(4)(+) and HSO(3)(-) liberation. Under oxidizing atmosphere, besides the reductions of tropaeolin, water and ferric ions, the existence of a homogeneous degradation was found. This process was explained (on the basis of surface iron potential monitoring) by a stepwise reduction of oxygen giving hydrogen peroxide. The initial stages of the mechanism were similar to those under inert atmosphere, but the degradation of the 1,2-dihydroxynaphthalene continued giving 1,2-naphthalenedione, then various polar monocyclic compounds leading to three unidentified volatile final products.
在氧化和惰性气氛下研究了铁对金莲橙的降解作用。通过各种色谱和光谱方法对产物进行了鉴定。在惰性气氛下，提出的机理模型基于金莲橙通过磺酸酯官能团吸附在固体铁上，随后 [键]Nz[双键]N[键] 键还原，生成 1-氨基-2-萘酚和磺胺酸。这两种中间体被还原为 1,2-二羟基萘和苯，并释放出 NH(4)(+) 和 HSO(3)(-)。在氧化气氛下，除了金莲橙、水和铁离子的还原反应外，还发现了均相降解过程。（基于表面铁电位监测）该过程通过氧气逐步还原生成过氧化氢来解释。该机理的初始阶段与惰性气氛下的相似，但 1,2-二羟基萘的降解继续进行，生成 1,2-萘醌，然后生成各种极性单环化合物，最终产生三种未鉴定的挥发性产物。
