Effect of surface acidic oxides of activated carbon on adsorption of ammonia

Huang, Chien-Sheng; Li, Hongsong; Chen, Chien‐Hung

doi:10.1016/j.jhazmat.2008.02.051

Cited by 194 publications

(106 citation statements)

References 21 publications

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“…activated carbons, zeolites, and so on) can be an excellent approach. [6][7][8][9][10][11][12] Among the different porous solids described in the literature, activated carbons exhibit certain advantages such as a high "apparent" surface area, a highly developed porous structure and, most importantly, the possibility to tailor the porous structure and surface chemistry in order to adapt it for a special application. 13 These modifications using pre-and post-synthesis treatments are very convenient when trying to adsorb polar gases (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Ammonia Removal Using Activated Carbons: Effect of the Surface Chemistry in Dry and Moist Conditions

Gonçalves

Sánchez‐García

Jardim

et al. 2011

Environ. Sci. Technol.

109

113

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The effect of surface chemistry (nature and amount of oxygen groups) in the removal of ammonia was studied using a modified resin-based activated carbon. NH 3 breakthrough column experiments show that the modification of the original activated carbon with nitric acid, i.e. the incorporation of oxygen surface groups, highly improves the adsorption behaviour at room temperature. Apparently, there is a linear relationship between the total adsorption capacity and the amount of the more acidic and less stable oxygen surface groups. Similar experiments using moist air clearly show that the effect of humidity highly depends on the surface chemistry of the carbon used. Moisture highly improves the adsorption behaviour for samples with a low concentration of oxygen functionalities, probably due to the preferential adsorption of ammonia via dissolution into water. On the contrary, moisture exhibits a small effect on samples with a rich surface chemistry due to the preferential adsorption pathway via Brønsted and Lewis acid centers from the carbon surface. FTIR analyses of the exhausted oxidized samples confirm both the formation of NH 4 + species interacting with the Brønsted acid sites, together with the presence of NH 3 species coordinated, through the lone pair electron, to Lewis acid sites on the graphene layers.

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Section: Introductionmentioning

confidence: 99%

“…6,7,9 Kim et al showed that not only the amount but also the nature of the oxygen surface groups present on the carbon surface, i.e. acidic groups, are responsible for the total amount adsorbed.…”

Section: Introductionmentioning

confidence: 99%

Ammonia Removal Using Activated Carbons: Effect of the Surface Chemistry in Dry and Moist Conditions

Gonçalves

Sánchez‐García

Jardim

et al. 2011

Environ. Sci. Technol.

109

113

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“…The impregnation of H 3 PO 4 on the activated carbon induces acidic groups at the basal planets of the activated carbon, and thus, creates more active sites on the activated carbon surface. Ammonia is a basic gas and the introduction of surface acidity by the impregnation of H 3 PO 4 promotes the NH 3 adsorption capacity on activated carbon via a Brønsted acid-base process [18]. It was reported that the activated carbon impregnated with H 3 PO 4 has a highly oxidized surface, contributing to the high surface acidity (pH < 3) [19].…”

Section: Z Lu Et Almentioning

confidence: 99%

Ammonia Removal from Rodent Habitat Operations in Space Using Phosphoric Acid Treated Activated Carbon

Lü¹,

Hines²,

Rozewicz³

et al. 2013

AJAC

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To accommodate long duration biology research with rodent habitats on the International Space Station while providing a healthy living and working environment for crewmembers, NASA Ames Research Center developed a new exhaust filter for odor control for the Animal Enclosure Module (AEM), which houses mice and rats. The new exhaust filter uses activated carbon pellets as adsorbents, with phosphoric acid (H 3 PO 4 ) impregnated on the surface. The deodorization performance of the new exhaust filters for AEM units housed with mice was evaluated. The ammonia breakthrough time of the exhaust filters was also investigated. The results indicated that H 3 PO 4 treated activated carbon exhibited a high ammonia adsorption capacity of more than 90%. Furthermore, the new exhaust filter can effectively control the odor from the AEM units for a 45-day (minimum) flight mission with a given animal biomass.

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Section: …………………………………………………………………………………………………… Introduction:-mentioning

confidence: 99%

“…For these special cases adsorption on porous solids (e.g. activated carbons, zeolites, and so on) can be an excellent approach (Huang et al,2008; Kim, and Park,2007;Le Leuch, and Bandosz, 2007; Park and Jin,2005;Petit and Bandosz, 2009; Zawadzki et al,2003;Bernal, et al, 1993; Bandosz and Petit,2009;Grant et al,2012).Among the different porous solids described in the literature, activated carbons exhibit certain advantages such as a high "apparent" surface area, a highly developed porous structure in order to adapt it for a special application, in addition to its simplicity and economy in configuration and operation. …”

mentioning

confidence: 99%

Adsorption of Ammonia Onto Activatedcarbon Prepared From Rice Straw.

Ghany¹,

Ahmed²,

Ashour³

2017

IJAR

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Many techniques were proposed for removal of ammonia as hazardous pollutant. Adsorption of ammonia from aqueous solutions onto activated carbon (prepared from rice straw as agricultural waste by calcination then activation with sodium hydroxide) was studied in batch reactor. Comparison of linear least-squares and trial-and-error nonlinear methods of widely used isotherms (Langmuir, Freundlich, and Redlich-Peterson) was examined. Results manifest that adsorption rate increases with temperature for calcination and activation. Maximum adsorption capacity of prepared activated carbon is96.4 mg.g …………………………………………………………………………………………………….... Introduction:-Different governments adopted new regulations in order to control pollutant emissions. Among them, ammonia is considered an important health hazard because it is poisonous if inhaled in great quantities (breathing levels above 50-100 ppm) while it can cause eyes, throat and nose irritation in lesser concentrations. Actual ammonia emissions are generated mainly from the fertilizer manufacture industry, coke manufacture, fossil fuel combustion, livestock and poultry management, and refrigeration methods. Among all these sources, fertilizers production accounts for about 90%of total ammonia emissions (Gonçalves et al.,2011).Many techniques have been proposed in the literature for the removal of NH 3 in industrial effluents. These include absorption by solution, reaction with other gases, ion exchange using polymeric resins, separation using membranes, thermal treatment, catalytic decomposition and adsorption by porous solids which are economically convenient for high concentration pollutants (Pez et al.,1988;Blonigen, et al., 2003;Blonigenet al.,2005;Yunlong et al.,2015;Jared et al., 2016 ).Some of these techniques (e.g. thermal combustion) are they become economically unviable for diluted waste streams. For these special cases adsorption on porous solids (e.g. activated carbons, zeolites, and so on) can be an excellent approach (Huang et al.,2008; Kim, and Park,2007;Le Leuch, and Bandosz, 2007; Park and Jin,2005;Petit and Bandosz, 2009; Zawadzki et al.,2003;Bernal, et al., 1993; Bandosz and Petit,2009;Grant et al.,2012).Among the different porous solids described in the literature, activated carbons exhibit certain advantages such as a high "apparent" surface area, a highly developed porous structure in order to adapt it for a special application, in addition to its simplicity and economy in configuration and operation.

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Effect of surface acidic oxides of activated carbon on adsorption of ammonia

Cited by 194 publications

References 21 publications

Ammonia Removal Using Activated Carbons: Effect of the Surface Chemistry in Dry and Moist Conditions

Ammonia Removal Using Activated Carbons: Effect of the Surface Chemistry in Dry and Moist Conditions

Ammonia Removal from Rodent Habitat Operations in Space Using Phosphoric Acid Treated Activated Carbon

Adsorption of Ammonia Onto Activatedcarbon Prepared From Rice Straw.

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