Kinetic study of the photocatalytic degradation of the acid blue 113 dye in aqueous solutions using zinc oxide nanoparticles immobilized on synthetic activated carbon

Document Type : Original Article


1 Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran

2 Department of Environmental Health Engineering, School of Health, Hamadan University of Medical Sciences, Hamadan, Iran

3 Research Center for Health Sciences and Dep. Environmental Engineering School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran

4 Department of Public Health, Khalkhal University of Medical Sciences, Khalkhal, Iran


Approximately 10-20% of the total dyes in the world is consumed in the textile industry. The present study aimed to investigate the photocatalytic activity of zinc oxide nanoparticles (ZnO) immobilized on synthetic activated carbon in the removal of the acid blue 113 dye from aqueous solutions. This experimental study was conducted in a photo-reactor with the useful volume of one liter. The effects of pH (3, 7, and 9), zinc oxide nanoparticle concentrations (0.1-0.4 mmol/l), concentration of activated carbon modified by zinc oxide nanoparticles (20, 40, 60, 80, and 100 mg/l), and the initial concentration of the dye (20, 40, 60, 80, 100, and 200 mg/l) were assessed. In addition, the kinetics of the reaction were investigated. The results indicated that the optimal conditions for the process were the pH of 3, activated carbon modified by zinc oxide nanoparticle concentration of 100 mg/l, ratio of 0.4 millimole of zinc oxide per gram of activated carbon, and acid blue 113 dye concentration of 100 mg/l, which resulted in the maximum efficacy of 96%. Moreover, removal efficiency using zinc oxide was greater in all the stages compared to removal efficiency using activated carbon. The kinetic rate was also determined, demonstrating that the process followed the first-order kinetics. In addition, the findings indicated that the process had outstanding efficiency in the removal of the acid blue 113 dye. The photocatalysis of nanoparticle oxidation on synthetic activated carbon could be used effectively as an advanced oxidation reaction to remove dyes.


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