Influence of generated intermediates' interaction on heterogeneous Fenton's degradation of an azo dye 1-diazo-2-naphthol-4-sulfonic acid by using sludge based carbon as catalyst

- End-products have higher tendency to be adsorbed on SC than primarily-formed.
- Higher initial H2O2 dosage results in intermediates with strong polarity.
- 9 model intermediates differ in their behavior on interactions with catalysts.
- Polar surface area dominated their adsorption on SC while Kow acts as a key role on HSC.