Cobalt-doped alumina catalysts in catalytic oxidation of tartrazine induced by Oxone®

Porous cobalt-doped alumina catalysts were synthetized using the sol-gel method. The synthesized materials were calcined at 500 degrees C, 1000 degrees C and 1100 degrees C and denoted as CoA-500, CoA-1000 and CoA-1100, respectively. Catalysts were characterized using XRPD, H-2-TPR and low temperature N-2 physisorption techniques. Applied techniques showed that the annealing temperature affects the structural and textural properties of the catalysts. The synthesized catalysts were investigated in the degradation of tartrazine in the presence of Oxone (R). The influence of the mass of catalyst, reaction time, reaction temperature and initial pH were investigated. The temperature increase was beneficial for the dye degradation rate. CoA-500 was proved to be the most efficient among the investigated catalysts. The reaction followed the pseudo-first order kinetics for all investigated temperatures for all three catalysts. All cobalt-doped alumina catalysts were found to be efficient in the Oxone (R) induced catalytic degradation of tartrazine with CoA-500 showing the best performance.

Automated summary

This study focused on the synthesis and application of porous cobalt-doped alumina catalysts in the degradation of tartrazine. It was found that CoA-500 exhibited the highest efficiency among the investigated catalysts. The degradation reaction followed pseudo-first order kinetics under different temperature conditions.