|
International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 7, 2015, pp. 2233-2244
|
Bioline Code: st15210
Full paper language: English
Document type: Research Article
Document available free of charge
|
|
International Journal of Environment Science and Technology, Vol. 12, No. 7, 2015, pp. 2233-2244
en |
Nitrogen-enriched activated carbons prepared by the activation of coniferous tree sawdust and their application in the removal of Nitrogen dioxide
Nowicki, P.; Kazmierczak, J.; Sawicka, K. & Pietrzak, R.
Abstract
A technology of obtaining nitrogen-enriched
activated carbons from coniferous tree sawdust by direct
activation of the precursor and physical activation with
CO2 is described. The effect of activation time, pyrolysis
temperature as well as modification with urea on the textural
parameters, acid–base character of the surface and
sorption properties of activated carbons has been tested.
The resulting carbons were characterised by low-temperature
nitrogen sorption and determination of the number of
surface oxygen groups. The sorption properties of the
materials obtained were characterised by nitrogen dioxide
adsorption in dry and wet conditions. The final products
were nitrogen-enriched microporous activated carbons of
medium-developed surface, showing very diverse nitrogen
content and acidic–basic character of the surface. The
results obtained in our study have proved that through
suitable choice of the activation and modification procedure
of coniferous tree sawdust, activated carbons can be
produced with high capacity towards nitrogen dioxide
adsorption, reaching to 69 and 46 mg NO2/g in dry and wet
conditions, respectively. The results of our study have also
shown that the adsorption ability of carbonaceous adsorbents
depends both on the method of preparation as well as
on the textural parameters and acid–base properties of the
adsorbents surface.
Keywords
Pine sawdust; Pyrolysis; Physical/direct activation; Carbonaceous adsorbents; Nitrogen enrichment; NO2 adsorption
|
|
© Copyright 2015 - International Journal of Environment Science and Technology Alternative site location: http://www.ijest.org
|
|