COMPARISON OF CATALYTIC ACTIVITIES OF MAGNETIC IRON OXIDES IN PHENOL DEGRADATION

Tóm tắt

Magnetic iron oxide-based materials have attracted great attention in catalysis due to their high activity, large availability, and easy catalyst collection and recycling. This work reports catalytic activities of magnetic iron oxides, which were synthesized via two different routes involving organic stabilizers, for the heterogeneous Fenton-like oxidation of phenol. Two kinds of catalysts, including crystalline Fe3O4 and amorphous nano-sized iron oxide particles, were formed according to the XRD and SEM data. Effects of reaction time, hydrogen peroxide amount, and solid catalyst on phenol degradation efficiency using the as-synthesized materials were investigated. The results showed that the synthesized crystalline Fe3O4 particles (1–5 μm) provided a higher overall phenol removal efficiency than the amorphous nano-sized iron oxide under similar reaction conditions. However, the initial oxidation rate was much faster by using the amorphous one. More than 98% phenol removal was obtained with the crystalline Fe3O4 after 60 min, while a similar efficiency was also achieved with the amorphous nano-sized iron oxide after 15 min but at significantly higher catalyst and H2O2 amounts.