On the reactive adsorption of ammonia on activated carbons modified by impregnation with inorganic compounds

Bandosz, Teresa J.; Petit, Camille

doi:10.1016/j.jcis.2009.06.039

Cited by 126 publications

(84 citation statements)

References 64 publications

(148 reference statements)

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“…On both materials, high capacities are measured compared to those on virgin activated carbons, which reaches few mg/g. 34,35 As indicated previously, the performance of GO-H is similar to that of impregnated activated carbons. 1,35 To understand the difference in the adsorption capacity, the detailed analyses of the surface chemistry and structure were performed.…”

Section: Resultssupporting

confidence: 69%

“…34,35 As indicated previously, the performance of GO-H is similar to that of impregnated activated carbons. 1,35 To understand the difference in the adsorption capacity, the detailed analyses of the surface chemistry and structure were performed. From the point of view of the porous structure, both materials are inaccessible to nitrogen molecule.…”

Section: Resultssupporting

confidence: 69%

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Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

2009

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Graphical content entryThe mechanism of ammonia adsorption on graphite oxide (GO) is strongly related to the GO preparation and chemical features, especially to the sulfur-containing groups present on its surface. SummaryGraphite oxide (GO) was synthesized using two different methods: one with sulfuric acid as part of the oxidizing mixture (Hummers-Offeman method), and another one without the sulfurcontaining compound involved in the oxidation process (Brodie method). They were both tested for ammonia adsorption in dynamic conditions, at ambient temperature, and characterized before 2 and after exposure to ammonia by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, potentiometric titration, energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS) and elemental analysis. Analyses of the initial materials showed that besides epoxy, hydroxyl and carboxylic groups, a significant amount of sulfur is incorporated as sulfonic group for GO prepared by the Hummers-Offeman method. The process of ammonia adsorption seems to be strongly related to the type of GO. For GO prepared by the Brodie method, ammonia is mainly retained via intercalation in the interlayer space of GO and by reaction with the carboxylic groups present at the edges of the graphene layers. On the contrary, when GO prepared by the Hummers method is used, ways of retention are different: not only does the intercalation of ammonia is observed but also its reaction with the epoxy, carboxylic and sulfonic groups present. In particular, during the ammonia adsorption process, sulfonic groups are converted to sulfates in presence of superoxide anions O 2 -* . These sulfates can then react with ammonia to form ammonium sulfates. For both GOs, an incorporation of a significant part of the ammonia adsorbed as amines in their structure is observed as a result of reactive adsorption.

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Section: Resultssupporting

confidence: 69%

Section: Resultssupporting

confidence: 69%

Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

2009

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“…Adsorption is the most versatile process and widely used for the pollutants removal from wastewaters. Several types of ammonia adsorbents have been tested so far, but most of them remain on a laboratorialscale application (Bandosz and Petit 2009). In recent years, the treatment of the ammonia found in liquid or gaseous effl uents by using adsorption onto activated carbon or other adsorbent material has been studied by several researchers.…”

Section: Introductionmentioning

confidence: 99%

Response surface methodology (RSM) and its application for optimization of ammonium ions removal from aqueous solutions by pumice as a natural and low cost adsorbent

Moradi¹,

Fazlzadeh²,

Pirsaheb³

et al. 2016

Archives of Environmental Protection

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This research was conducted to study the adsorption of ammonium ions onto pumice as a natural and low-cost adsorbent. The physico-chemical properties of the pumice granular were characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Modeling and optimization of a NH 4 + sorption process was accomplished by varying four independent parameters (pumice dosage, initial ammonium ion concentration, mixing rate and contact time) using a central composite design (CCD) under response surface methodology (RSM). The optimum conditions for maximum removal of NH 4 + (70.3%) were found to be 100 g, 20 mg/l, 300 rpm and 180 min, for pumice dosage, initial NH 4 + ion concentration, mixing rate and contact time. It was found that the NH 4 + adsorption on the pumice granular was dependent on adsorbent dosage and initial ammonium ion concentration. NH 4 + was increased due to decrease the initial concentration of NH 4 and increase the contact time, mixing rate and amount of adsorbent.

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“…6 A similar beneficial effect for the ammonia removal has been described in the literature for metal-modified (Fe, Co, Cr, Mo and W) activated carbons. 8,10,14 Different reaction mechanisms have been proposed for the adsorption process involving mainly Brønsted acid sites, but the true pathway is still under debate. Unfortunately, many of these studies described in the literature deal with a wide variety of carbon samples, i.e.…”

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.

119

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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On the reactive adsorption of ammonia on activated carbons modified by impregnation with inorganic compounds

Cited by 126 publications

References 64 publications

Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

Response surface methodology (RSM) and its application for optimization of ammonium ions removal from aqueous solutions by pumice as a natural and low cost adsorbent

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

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