Sala Mireia, López-Grimau Víctor, Gutiérrez-Bouzán Carmen
Institute of Textile Research and Industrial Cooperation of Terrassa, Universitat Politècnica de Catalunya-Barcelona Tech (UPC), Colom 15, Terrassa 08222, Spain.
Department of Project and Construction Engineering, Universitat Politècnica de Catalunya-Barcelona Tech (UPC), Colom 11, Terrassa 08222, Spain.
Materials (Basel). 2016 Mar 18;9(3):211. doi: 10.3390/ma9030211.
An electrochemical treatment (EC) was applied at different intensities to degrade the chromophoric groups of dyes C.I. Reactive Black 5 (RB5) and C.I. Reactive Blue 7 (Rb7) until uncolored species were obtained. Decolorization rate constants of the azo dye RB5 were higher than the phtalocyanine Rb7 ones. In addition, the EC treatment was more efficient at higher intensities, but these conditions significantly increased the generation of undesirable by-products such as chloroform. The combination of EC with UV irradiation (UVEC) drastically minimized the generation of chloroform. The photo-assisted electrochemical treatment was also able to achieve decolorization values of 99%. Finally, mixtures of dyes and surfactants were treated by EC and UVEC. In the presence of surfactants, the decolorization kinetic of dyes was slowed due to the competitive reactions of surfactants degradation. Both methods achieved total decolorization and in both cases, the generation of haloforms was negligible.
采用不同强度的电化学处理（EC）来降解活性染料C.I. 活性黑5（RB5）和C.I. 活性蓝7（Rb7）的发色基团，直至获得无色物质。偶氮染料RB5的脱色速率常数高于酞菁染料Rb7。此外，较高强度下的EC处理效率更高，但这些条件会显著增加氯仿等不良副产物的生成。EC与紫外线照射（UVEC）相结合可大幅减少氯仿的生成。光辅助电化学处理也能够实现99%的脱色率。最后，用EC和UVEC处理染料与表面活性剂的混合物。在表面活性剂存在的情况下，由于表面活性剂降解的竞争反应，染料的脱色动力学减缓。两种方法均实现了完全脱色，且在两种情况下，卤代烃的生成量均可忽略不计。
