Kinetic analysis of azo dye decolorization during their acid–base equilibria: photocatalytic degradation of tartrazine and sunset yellow

  • Mahsa Rashidi
  • S. Maryam SajjadiEmail author
  • Hassan Zavvar Mousavi


In this study, the kinetics of the photodegradation of tartrazine (TA) and sunset yellow (SY) was systematically evaluated at different pH values in the presence of α-Fe2O3 nanostructures as a cost-effective and efficient photocatalyst. For each dye, time-spectral data was recorded in the pH range 8–12, then the whole data was resolved by hard soft-modelling parallel factor analysis to obtain the kinetic profiles of the components existing during simultaneous kinetic and equilibria processes. Then, the rate constants of degradation processes together with their uncertainties were computed. The results revealed that pH strongly affects the mechanism and the rate constants of the dyes photoreactivity due to changing the structure of the analytes. In fact, those protonated/deprotonated structures with resonance forms were less degradable because of their stability and then showed lower rate constant(s).


Photocatalytic degradation Azo dyes Acid–base equilibria Multivariate analysis 



This work was financially supported by the Semnan University Research Council.

Supplementary material

11144_2019_1654_MOESM1_ESM.docx (537 kb)
Supplementary material 1 (DOCX 537 kb)
11144_2019_1654_MOESM2_ESM.xlsx (185 kb)
Supplementary material 2 (XLSX 185 kb)


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Faculty of ChemistrySemnan UniversitySemnanIran
  2. 2.Department of Chemistry, Faculty of ScienceUniversity of GuilanRashtIran

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