Two different visible light (Vis) assisted heterogeneous photocatalytic systems (BS (bisulfite)/Fe–Co-SBA (Fe–Co-Santa Barbara amorphous material)/Vis and H2O2 (hydrogen peroxide)/Fe–Co-SBA/Vis) for degrading Orange Ⅱ were investigated. The role of some significant parameters on the degradation of Orange Ⅱ in the two systems were studied separately and compared. The concentration of either BS or H2O2 led to a significant effect on the degradation of Orange Ⅱ. In addition, BS/Fe–Co-SBA/Vis system was found to be suitable for a wider pH range of 3–9. However, we found that the initial pH of solution during the reaction had a great influence on the degradation of Orange II in the H2O2/Fe–Co-SBA/Vis system. The main free radicals involved in the degradation of Orange II in the BS/Fe–Co-SBA/Vis system were ·OH and SO4·- while they were mainly ·OH radicals in the H2O2/Fe–Co-SBA/Vis system as determined by electron spin-resonance (ESR) spectroscopy. Photocatalytic dye degradation mechanisms were proposed for both the systems based on the generation of different radicals in each system.
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials