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Efficient degradation of phenol using natural clay as heterogeneous Fenton-like catalyst

Djeffal, Lemya, Abderrahmane, Sihem, Benzina, Mourad, Fourmentin, Marc, Siffert, Stéphane, Fourmentin, Sophie
Environmental science and pollution research international 2014 v.21 no.5 pp. 3331-3338
X-ray diffraction, atmospheric pressure, catalytic activity, chemical analysis, clay, hydrogen peroxide, iron oxides, particle size, phenol, thermal analysis
A natural containing Fe-clay (NRC) was used for the Fenton-like oxidation of phenol. This new catalyst was very efficient in phenol elimination in aqueous medium under mild experimental conditions (20 °C, atmospheric pressure and low concentration of hydrogen peroxide). The influence of different parameters like calcination's temperature, particle size, initial phenol and H₂O₂concentrations were examined considering both phenol conversion and total organic carbon (TOC) removal. NRC was characterized by several complementary methods including chemical analysis, X-ray diffraction (XRD), Mössbauer spectroscopy, thermogravimetry-differential thermal analysis (TG-DTA), temperature programmed reduction (TPR) and BET. The experimental results showed that 100 % phenol conversion and 70 % TOC removal can be achieved using sieved and calcined NRC (d < 50 μm/450 °C). Catalytic activity of NRC was mainly attributed to the amount of iron oxide species (12.15 wt.%) present naturally in the clay.