چكيده فارسي :
Textile industries produce effluents contain a large amount of colored dye contents which are toxic, non-biodegradable and has been considered as an important source of water pollutions in the world]1[. Mixing even only small proportion of these dyes with water cause environmental pollution and some other severe problems. Refractory azo dyes with one or more azo group (–N=N–) are one of the main class of colorants, constitute about a half of global production and used in tattooing, cosmetics, foods products, paper and texture industries and are commonly detected in texture wastewater (about 15% of them end up in wastewaters after dyeing operation processes).Due to their high surface to bulk ratio, nanoparticles possess high catalytic activity, have emerged in the treatments of several toxic chemicals in the environmentsuch as removing chemical wastes from water due to their potentials as promising candidates for sensors and catalysts. Oil/water interface strategy is introduced to provide effective platforms for rapid fabrication of large-area self-assembled nano films composed of different nanosized structures such as nanoparticles at room temperature ]2, 3[.
In this study, the reactions between some azo dyes and NaBH4 catalyzed by nanoparticles thin films have been investigated. Here, we report insitu degradation of methyl orange, methyl red and bismarck brown by using thin films that monitored by UV–Vis spectroscopy. We used different thin films such as Pt, PtPd and PtFeFe2O3nanoparticle films and activity of these films was compared in the degradation of different dyes. Rate constants for the catalyzed reactions have been determined. PtPd nanoparticles thin film has shown the highest rate constant for the degradation of methyl orange.
