Surface oxide structures on a commercial activated carbon

Ishizaki, Chanel; Martí, Iris

doi:10.1016/0008-6223(81)90023-3

Cited by 139 publications

(55 citation statements)

References 20 publications

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“…The spectrum of the char also shows an intensification of the band at 1600 cm -1 that can be associated to quinone groups [27,28]. This band, together with the overlapping bands between 1000 and 1500 cm -1 have also been attributed to carboxylcarbonate structures [29,30]. The presence of these basic oxides helps to explain the basicity of the char and its relatively high oxygen content.…”

Section: Resultsmentioning

confidence: 86%

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Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Plaza

Pevida

Arias

et al. 2009

Fuel

191

109

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In this work a series of carbon adsorbents were prepared from a low-cost biomass residue, olive stones. Two different approaches were studied: activation with CO 2 and heat treatment with gaseous ammonia. The results showed that both methods are suitable for the production of adsorbents with a high CO 2 adsorption capacity, and their potential application in VSA or TSA systems for postcombustion CO 2 capture. It was found that the presence of nitrogen functionalities enhances CO 2 adsorption capacity, especially at low partial pressures.

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Section: Resultsmentioning

confidence: 86%

“…However, as previously discussed, the DRIFT spectrum of GKOS does not show any characteristic band at 1750 cm -1 , typical of those species. The presence of carboxyl-carbonates was also reported [29,30]. These groups could release CO 2 upon heating, which would explain the CO 2 emissions from GKOS.…”

Section: Characterisation Of the Activated Samplesmentioning

confidence: 75%

Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Plaza

Pevida

Arias

et al. 2009

Fuel

191

109

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“…Even though a cluster of functional groups were present on the carbon surface, the prominent among them was a sharp and intense band centered around 1,691.51 cm −1 which was attributed to the carbonyl (-C=O) stretching vibration of quinine or quinone or conjugated ketone (Ji et al 2007;Biniak et al 1997;Yu et al 2008;Ishizaki and Marti 1981;Shin et al 1997;Moreno-Castilla et al 1998;Starsinic et al 1983;Zawadzki 1989). The carbon surface is oxidized by treatment with concentrated HNO 3 leading to the generation of such quinone type carbon functional groups which bear significance in the redox chemistry of carbon materials.…”

Section: Ftir Spectroscopy Of Nvnc Before and After Defluoridationmentioning

confidence: 99%

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

2015

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Background: Deleterious effects of fluoride contamination in ground waters on the health of human beings are well known and intensive research on developing de-fluoridation methods is globally pursued. Of the various methodologies, increasing interest is being envisaged in using the adsorption methods based on active carbons derived from plant material. In the present investigation, Nitric acid activated carbon derived from barks of Vitex negundo plant (NVNC) is probed for its de-fluoridation abilities. Methods: The activated carbon is characterized adopting various physicochemical methods and surface morphological studies are carried out using FT-IR and SEM-EDX techniques. The effect of various parameters such as pH, sorbent dosage, agitation time, initial concentration of fluoride, temperature, particle size and presence of foreign ions on the extraction of the fluoride is studied adopting Batch methods.The adsorption process is analyzed with Freundlich, Langmuir, Temkin and Dubinin-Radushkevich (D-R) isotherms and kinetics of adsorption is studied using pseudo first-order, pseudo second-order, Weber and Morris intraparticle diffusion, Bangham's pore diffusion and Elovich equations. The methodology developed is applied to real ground water samples.

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“…Although CO 2 evolution in that temperature range is commonly assigned to decomposition of carboxyls and lactones, the DRIFT (diffuse reflectance infrared Fourier transform) spectrum of A ( Figure 2) does not show the characteristic band in the nearby of 1700 cm -1 . However, it does present a sharp band at 1600 cm -1 and a group of overlapping bands between 1100 and 1500 cm -1 that have been related to carboxylcarbonate structures [28,29]. AA750 presents CO 2 evolution at lower temperature, with maximum at 145 ºC, which might come from the decomposition of labile carboxyls formed upon exposure to air after the activation process [30].…”

Section: Chemical Characterisationmentioning

confidence: 99%

Developing almond shell-derived activated carbons as CO2 adsorbents

Plaza

Pevida

Martín

et al. 2010

Separation and Purification Technology

188

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Two series of carbon dioxide adsorbents were prepared from almond shells, by carbonisation followed either by activation with CO 2 or by heat treatment in the presence of ammonia gas (amination). Both procedures gave carbons with high CO 2 adsorption capacities in pure CO 2 as well as in a binary mixture of 15 % CO 2 in N 2 .Activation with carbon dioxide significantly developed porosity in the samples, mostly in the micropore domain, while amination at 800 ºC moderately developed narrow microporosity in the char and incorporated stable nitrogen functionalities, which enhanced CO 2 selectivity. Amination showed two additional advantages over conventional activation with CO 2 : a greater carbon yield and a shorter soaking time.

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Surface oxide structures on a commercial activated carbon

Cited by 139 publications

References 20 publications

Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Development of low-cost biomass-based adsorbents for postcombustion CO2 capture

Removal of fluoride from polluted waters using active carbon derived from barks of Vitex negundo plant

Developing almond shell-derived activated carbons as CO2 adsorbents

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