Influence of the medium pH on the catalytic activity of the CuO-based catalyst in the Fenton system

The influence of the medium pH on the activity of the heterogeneous nanostructured magnetically sensitive catalyst SiO2/CoFe2O4/SiO2/CuO in the Fenton system was investigated and the reaction mechanism was proposed. It was determined that the catalytic centers are Cu+ and Cu2+. It was established that the rate of destruction of the dye methylene blue (MB) as a model wastewater pollutant in the first 20 min of the process depends on pH, and its value decreases in the pH range (9)>(6)>(3). After 2 h, for all initial pH values, the degree of MB destruction reaches 85-90%, and the pH changes to neutral. The proposed system can be used in the technology of post-treatment of industrial and domestic wastewater.