Katalitička aktivnost uzoraka pseudobemita impregnisanih različitim koncentracijama kobalta u oksidativnoj degradaciji tartrazina u prisustvu Oksona

Pseudobemit je impregnisan kobaltom postupkom kapilarne impregnacije. Za impregnaciju su korišćene dve koncentracije, 3 mas% i 6 mas% Co 2+ u odnosu na masu pseudobemita. Dobijeni materijali su žareni na 500 ºC. Sintetisani katalizatori su ispitani u procesu oksidativne degradacije boje tartrazina u prisustvu Oksona kao izvora sulfatnih radikal anjona. Ispitivan je uticaj tempreature na efikasnost degradacije boje. Uočeno je da brzina degradacije raste sa porastom temperature. Eksperimentalno dobijeni rezultati su testirani korišćenjem najčešćih kinetičkih modela i dobijeno je da reakcija u svim slučajevima sledi brzinu pseudo-prvog reda. Takođe je uočeno da sa porastom sadržaja kobalta raste efikasnost katalizatora. Da bi se odredilo koja je reaktivna oksidativna vrsta dominantna u ispitivanom procesu, u reakcioni sistem je dodavan tercijalni butanol, odnosno etanol. Utvrđeno je da su sulfatni radikal anjoni dominantna reaktivna vrsta.
Pseudoboehmite was impregnated with cobalt using a incipient wetness impregnation method. Two different concentrations of cobalt were used for impregnation: 3 mas% and 6 mas% of Co2+ relative to the mass of pseudoboehmite. The obtained materials were calcined at 500 ºC. The synthesized catalysts were tested in the process of oxidative degradation of tartrazine dye in the presence of Oxon as a source of sulfate anion radicals. The influence of temperature on the dye degradation efficiency was investigated. It was observed that the degradation rate increases with the increasing of temperature. The experimentally obtained results were tested using the most common kinetic models and it was found that the reaction follows a pseudo-first order rate in all cases. It was also observed that with an increase in the cobalt content, the efficiency of the catalyst increases. In order to determine which reactive oxidative species is dominant in the investigated process, tertiary buthalnol and ethanol was added to the reaction system. According to the experimental results sulfate anion radicals were found to be the dominant reactive species.