Mbarek, B.; Pineda, E.; Khitouni, M.; Fiol, N.; Escoda, L.; Suñol, J.J. European Congress and Exhibition on Advanced Materials and Processes Data de presentació: 2015-09-24 Presentació treball a congrés
Azo compounds are one of the most common families of dyes used in textile and leather
treatments. An important step during the treatment of water polluted by these
compounds, is the degradation of the compounds by decomposition of the -N=N- bonds,
producing the de-colorization of the water. This de-colorization reaction can be
activated by the presence of zero valent metallic particles. The metastable structures
generated during rapid solidification tend to increase the chemical activity of the alloys.
Recently, it has been discovered that the use of metallic particles in a metastable phase
(amorphous or nanocrystalline) multiplies significantly the efficiency of the decolorization
water-treatment step. Here we present the results obtained in the decolorization
of water using alloys based on different metals (Fe, Mn, Ni and Al)
produced by rapid solidification and posterior ball milling. For some Al-containing
alloys the results show a fast reaction, even in neutral pH conditions. In this work, the
efficiency of the different metastable alloys in the de-colorization process, the effects of
the metastable structure and the processing conditions are presented and assessed.