Highly efficient removal of Direct Red 89 from aqueous solution by homogeneous catalyst produced during electrocoagulation for PS/H2O2 activation

Abstract

The study explored the simultaneous use of peroxydisulfate (PS) and hydrogen peroxide (H2O2) in the electrocoagulation process for efficient removal of direct red 89 (DR89) from aqueous solutions. The study examined the effect of various parameters, including electrode type, electrolyte type and dosage, initial pH, current density, PS and H2O2 dosage, and initial DR89 concentration. The highest efficiency was achieved in acidic conditions using AL-Fe electrodes and Na2SO4 as a supporting electrolyte and applying the highest studied current density (20 mA/cm2). The study found that DR89 removal followed second-order reaction kinetics, and singlet oxygen played a significant role in DR89 degradation.