Chemical Characterization of Activated Carbon Fibers and Activated Carbons

Nabais, J.M. Valente; Carrott, P.J.M.

doi:10.1021/ed083p436

Cited by 23 publications

(6 citation statements)

References 4 publications

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“…The points-of-zero-charge (PZC) values were determined by using the method proposed by Valente Nabais and Carrott. [51] Specific surface areas of the carbon samples were determined by N 2 adsorption isotherms at 77 K in a Quantachrome Autosorb-1, applying the BET method. X-ray photoelectron spectroscopy (XPS) analyses were performed with a XSAM800 X-ray spectrometer, operated in the fixed analyzer transmission (FAT) mode, with a pass energy of 20 eV, a power of 130 W and by using a non-monochromatic radiation from Mg anode (main h = 1486.6 eV).…”

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confidence: 99%

Acid‐Activated Carbon Materials: Cheaper Alternative Catalysts for the Synthesis of Substituted Quinolines

et al. 2013

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We describe the first examples of Friedländer reactions efficiently catalyzed by carbon materials. We report herein a series of acidic activated carbon materials, which can be considered as an environmentally friendly, cheaper alternative to the traditional acidic mesoporous silicates or even zeolites for the synthesis of quinolines/quinolones. Textural parameters of the acidic activated carbon materials together with their acidic properties are important factors that affect the reaction selectivity. Some mechanistic details have been addressed by computational calculations.

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confidence: 99%

Acid‐Activated Carbon Materials: Cheaper Alternative Catalysts for the Synthesis of Substituted Quinolines

et al. 2013

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“…The point of zero charge (p.z.c.) values were determined under batch conditions using the method proposed by Nabais and Carrott [ 46 ].…”

Section: Methodsmentioning

confidence: 99%

Hydrothermal Carbon Coating of an Activated Carbon—A New Adsorbent

2023

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A new adsorbent material was prepared by coating an activated carbon with hydrothermal carbon obtained from sucrose. The material obtained has different properties from the sum of the properties of the activated carbon and the hydrothermal carbon, which shows that a new material was obtained. It has a high specific surface area (1051.9 m2 g−1) and is slightly more acidic than the starting activated carbon (p.z.c.-point of zero charge 8.71 vs. 9.09). The adsorptive properties of a commercial carbon (Norit RX-3 Extra) were improved over a wide pH and temperature range. The capacity values of the monolayer according to Langmuir’s model reached 588 mg g−1 for the commercial product and 769 mg g−1 for the new adsorbent.

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“…The point of zero charge (p.z.c.) values were determined under batch conditions using the method proposed by Nabais and Carrott [64].…”

Section: Adsorbent Characterizationmentioning

confidence: 99%

Unlocking the Potential of Chemically Modified Carbon Gels in Gallic Acid Adsorption

Carvalho,

Durán-Valle,

Adame-Pereira

2024

Gels

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This study deals with the preparation of adsorbents from a commercial xerogel by chemically modifying its surface with concentrated mineral acids and alkali metal chlorides, their physicochemical characterization, and their use as adsorbents for gallic acid in aqueous solution. Although there are publications on the use of carbon xerogels as adsorbents, we propose and study simple modifications that can change their chemical properties and, therefore, their performance as adsorbents. The adsorbate of choice is gallic acid and, to our knowledge, there is no history of its adsorption with carbon xerogels. The prepared adsorbents have a high specific surface area (347–563 m2 g−1), better pore development for samples treated with alkali metal chlorides than with mineral acids, and are more acidic than the initial xerogel (p.z.c range 2.49–6.87 vs. 7.20). The adsorption equilibrium is reached in <16 h with a kinetic constant between 0.018 and 0.035 h−1 for the pseudo-second-order model. The adsorption capacity, according to the Langmuir model, reaches 62.89 to 83.33 mg g−1. The adsorption properties of the commercial xerogel improved over a wide range of pH values and temperatures. The experimental results indicate that the adsorption process is thermodynamically favored.

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Chemical Characterization of Activated Carbon Fibers and Activated Carbons

Cited by 23 publications

References 4 publications

Acid‐Activated Carbon Materials: Cheaper Alternative Catalysts for the Synthesis of Substituted Quinolines

Acid‐Activated Carbon Materials: Cheaper Alternative Catalysts for the Synthesis of Substituted Quinolines

Hydrothermal Carbon Coating of an Activated Carbon—A New Adsorbent

Unlocking the Potential of Chemically Modified Carbon Gels in Gallic Acid Adsorption

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