Absorption spectra of gelatin copper complexes and copper (II) sulfate and their impact on cotton peroxide bleaching

Abstract

ABSTRACTA gelatin copper complex was synthesized with gelatin and copper (II) sulphate. The previous study had indicated that the gelatin copper complex could improve peroxide bleaching effectiveness of cotton in low-temperature. By measuring the spectra absorption abilities of gelatin, copper (II) sulphate and gelatin copper complex respectively, it proved that gelatin copper complex was formed. The catalytic bleaching effectiveness of H2O2/gelatin copper complex system and H2O2/copper (II) sulphate system were compared. The results show that the gelatin copper complex and copper (II) sulphate can catalyze hydrogen peroxide decomposition and improve the whiteness of bleached cotton. Whiteness and capillary effects of the cotton fabric bleached in H2O2/gelatin copper complex system and in H2O2/copper (II) sulphate system at 70℃ are close to the conventional high-temperature bleaching. Besides, the strength retention of the fabric bleached in H2O2/gelatin copper complex system at 70℃ is the biggest among the three samples. The strength retention of the fabric bleached in H2O2/copper (II) sulphate system at 70℃ is the smallest among the three samples. So gelatin copper complex is a more effective catalyst than copper (II) sulphate in low temperature peroxide bleaching of cotton fabric.