Coordination Behaviors of Cu2+ With Azo Dye Acid Black 10B

Abstract

Abstract This study mainly explored the coordination relationship between Cu2+ and functional groups of acid black 10B, including sulfonic group, azo group, amino group, hydroxyl group and nitro group. By means of UV-vis spectrum scanning, FTIR and XPS techniques, the complex reaction process of cooper ion with dye molecule and their precipitate formed during alkali titration were analyzed. The results showed that copper ion had coordination with all the above groups, and its coordination with azo group and sulfonic group can be able to form a closed ring structure similar to chelate. The spectra characteristics of precipitate revealed that copper ions could play bridging role between amino and hydroxyl and its coordination process would be affected by the pH value of the solution.