EFFECT OF COPPER AND NICKEL SUPPORTED ACTIVATED CARBON CATALYSTS ON THE SIMULTANEOUS ADSORPTION/OZONATION PROCESS OF NITROBENZENE DEGRADATION

Monia Guiza, Asma Abdedayem, Imen Ghouma, Abdelmottaleb Ouederni
2017 Journal of Chemical Technology and Metallurgy   unpublished
Nickel and copper supported activated carbon (Ni/AC,Cu/AC) prepared by wetness impregnation process were used in the heterogeneous ozonation of nitrobenzene in water. The effect of the preparation conditions on catalysts characteristics was examined in order to optimize the metals content, the temperature and the calcination time. The two catalysts were characterized on the ground of Brunauer-Emmett-Teller adsorption isotherm application, through Fourier transform infrared spectroscopy,
more » ... ectroscopy, temperature programmed-desorption mass spectrometry, Boehm analysis and point of zero charge analysis. It was found that the catalyst properties and the functional surface groups were affected by the operating conditions. The maximum specific surface area of the catalysts was obtained when 12 % (w/w) of Cu or 4 % (w/w) of Ni were deposited on activated carbon and calcined at 550°C for 2 h. The effect of Cu and Ni addition to the activated carbon on nitrobenzene adsorption capacity was also examined. The results showed that the activated carbon adsorption capacity was improved through impregnation. The tests carried out in a semi-batch reactor showed that the presence of AC, Ni/AC or Cu/AC catalyst enhanced considerably the degradation efficiency in respect to nitrobenzene and improved significantly its mineralization when compared to the process of its ozonation in absence of a catalyst. TOC removal reached 86 %, 80 %, 69 % in the course of ozonation (an ozone flow rate of 30 mg/h) of 20 mg/l nitrobenzene for 60 min oxidation time in the presence of Cu/AC, Ni/AC, AC catalyst, respectively. TOC was 25 % in absence of a catalyst. Cu/AC exhibited the highest catalytic activity.
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