NO2 removal on adsorbents prepared from coffee industry waste materials

Abstract

A technology for obtaining carbonaceous adsorbents by physical and chemical activation of waste materials from coffee industry is described. The effect of pyrolysis temperature and type of activation procedure on the textural parameters, acid-base character of the surface and sorption properties of activated carbons has been tested. The resulting carbons were characterized by lowtemperature nitrogen sorption, determination of pH and the number of surface oxygen groups. The sorption properties of the activated carbons obtained were characterized by evaluation of nitrogen dioxide adsorption in dry and wet conditions. The final products were adsorbents of specific surface area ranging from 5 to 2,076 m 2 /g and pore volume from 0.03 to 1.25 cm 3 /g, showing very diverse acidicbasic character of the surface. The results obtained in our study have proved that a suitable choice of the pyrolysis and activation procedure for coffee industry wastes permits production of adsorbents with high sorption capacity of nitrogen dioxide, reaching to 44.5 and 84.1 mg NO 2 /g in dry and wet conditions, respectively.

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

“…However, at the end of the experiment, more NO x was clearly trapped on AC-H 2 O than on AC-CO 2 . The obtained capacities for NO 2 adsorption are in the same range as those available in the literature [34,35]. However, it is important to notice that the operating conditions in this present study are different from the ones available in the literature.…”

“…This difference is attributed to a higher amount of basic groups for AC-H 2 O, as shown in the TPD-MS analysis. The role of surface chemistry on the interaction of NO 2 with activated carbons was already mentioned in previous investigations performed at higher NO 2 concentration (1000 ppm) [34][35][36][37]. However, no clear role of acidic and basic groups on the NO 2 adsorption capacity was identified.…”

The effect of mineral matter on the physicochemical and sorption properties of brown coal-based activated carbons

“…The main premises in favor of undertaking the adsorption study toward gas pollutants of acidic nature were the high content of mineral substance in the activated carbons structure as well as the presence of a high number of basic surface functional groups, which, according to previous literature reports, have a positive impact on the effectiveness of removal of this type of pollution (Yuan and Bandosz 2007;Feng et al 2005;Nowicki et al 2013Nowicki et al , 2014Kante et al 2012). To verify this supposition, all the materials prepared were subjected to adsorption tests in four variants.…”

“…From among the various materials used for this purpose (Goscianska et al 2013;Wiśniewska et al 2007Wiśniewska et al , 2013Wiśniewska et al , 2014Kierys et al 2013;Wiśniewska 2010Wiśniewska , 2012Krysztafkiewicz et al 2002;Thomas and Syres 2012;De Smedt et al 2015;Qian et al 2015) the most popular and promising are the carbonaceous sorbents, especially activated carbons (Jiang et al 2015;Deng et al 2015;Sharma and Upadhyay 2009;Goscianska and Pietrzak 2015;Jiang and Chen 2011). Such materials could be prepared in a simple way by physical or chemical activation of variety of organic substances, including wood (Wang et al 2009;Nowicki et al 2015a), peat (Khadiran et al 2015), fossil coals (Nowicki and Pietrzak 2011;Maroto-Valer et al 2005;Teng et al 1998) as well as many biodegradable (Karagöz et al 2008;Soleimani and Kaghazchi 2008;Kazmierczak et al 2013Kazmierczak et al , 2015Nowicki et al 2015b) and industrial waste (Nakagawa et al 2003;Hofman and Pietrzak 2011;Nowicki et al 2013;Lin and Teng 2002). Taking into account economic and ecological aspects, particularly suited for this purpose are fossil coals of low quality, the use of which in a chemical industry (e.g.…”

Removal of NO2 by carbonaceous adsorbents obtained from residue after supercritical extraction of marigold

“…One of the most effective methods for elimination of pollutants is their adsorption by activated carbons (Bansal and Goyal 2005;Guo et al 2013;Nowicki et al 2013). Thanks to their strongly developed porous structure, activated carbons show very good sorption properties, from both liquid and gas phase and that is why they have been applied in many areas (Aysu and Küçük 2015;Kazmierczak et al 2013;Nowicki et al 2008).…”