Abstract
The bicarbonate-activated hydrogen peroxide (BAP) with heterogeneous catalysts has been demonstrated to have a good future for organic pollutants removal in wastewater treatment. Herein, a novel catalyst, cobalt nanoparticles encapsulated in nitrogen-doped carbon nanotubes ([email protected]) was prepared by pyrolysis of Co salt and melamine, followed by acid treatment to remove excess metallic cobalt. Combining the hollow carbon nanotube structure and Co nanoparticles, the [email protected] offers excellent catalytic performance for acid orange 7 degradation in the BAP system. High stability against cobalt ions leaching from the [email protected] was observed, which is superior to the previously reported heterogeneous catalysts·H2O2 activation mechanism by [email protected] catalyst was also proposed, in which superoxide ion and single oxygen are the dominant reactive species from H2O2 decomposition by the synergistic effect of Co(0) and N species.
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