The Effect of Carbonization and Activation on NO2 Sorptive Capacity of Adsorbents Obtained from Sewage Sludge
Robert Pietrzak
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Laboratory of Coal Chemistry and Technology, Faculty of Chemistry,
Adam Mickiewicz University,
Grunwaldzka 6, 60-780 Poznań, Poland
Pol. J. Environ. Stud. 2010;19(3):659–662
The effect of the processes of carbonization and activation on adsorbents obtained from sewage sludge and evaluation of the sorption properties of such adsorbents towards NO2 was studied. Carbonaceous adsorbents were obtained by carbonization of sludge at 600ºC for four different times (30, 60, 90 and 120 min.) followed by activation of the carbonisates by CO2 at 800ºC for 60 min. Adsorption of NO2 was carried out in dry air. It has been shown that by appropriate thermal and chemical treatment of sludge, mesoporous adsorbents can be obtained that are capable of NO2 removal. The activation of the carbonisates with CO2 was found to substantially improve their sorption properties. The best NO2 sorption capacity from among the samples obtained by carbonization at 600ºC or by carbonization at 600ºC followed by activation by CO2 at 800ºC was obtained for the samples carbonised for 90 minutes.