Effects of electrochemical treatment of granular activated carbon on surface acid groups and the adsorptive capacity for phenol

Mehta, Mihir P.; Flora, Joseph R.V.

doi:10.1016/s0043-1354(97)00057-2

Cited by 19 publications

(9 citation statements)

References 6 publications

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“…As seen in Figure 3a, GAC without PFAA sorption exhibited several distinct functional groups, including non-aromatic halogenated hydrocarbons (586 cm -1 ), non-aromatic ethers, acetals and epoxides (1496 cm -1 ), non-aromatic mercaptans and sulfides (1608 cm -1 and 1646 cm -1 ), non-aromatic ketones (2345 cm -1 ). This is consistent with the understanding that GACs generally contain surface functional groups like carboxyl, lactones, carbonyl and phenolic hydroxyl, etc (Mehta and Flora, 1997;Chen et al, 2012;Singha et al, 2013).…”

Section: Atr-ftir Spectroscopysupporting

confidence: 90%

Sorption of perfluorooctanoic acid, perfluorooctane sulfonate and perfluoroheptanoic acid on granular activated carbon

et al. 2016

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The sorption of perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA), and perfluoroheptanoic acid (PFHpA) on granular activated carbon (GAC) was characterized and compared to explore the underlying mechanisms. Sorption of the three perfluoroalkyl acids (PFAAs) on GAC appeared to be a rapid intra-particle diffusion process, which were well represented by the pseudo-second-order rate model with the sorption rate following the order PFOS > PFOA > PFHpA. Sorption isotherm data were well fitted by the Freundlich model with the sorption capacity (Kf) of PFOS, PFOA and PFHpA being 4.45, 2.42 and 1.66 respectively. This suggests that the hydrophilic head group on PFAAs, i.e. sulfonate vs carboxylic, has a strong influence on their sorption. Comparison between PFOA and PFHpA revealed that hydrophobicity could also play a role in the sorption of PFAAs on GAC when the fluorocarbon chain length is different. Analyses using Attenuated Total Reflection (ATR)-Fourier Transform Infrared (FTIR) spectroscopy suggested possible formation of a negative charge-assisted H-bond between PFAAs and the functionalities on GAC surfaces, including non-aromatic ketones, sulfides, and halogenated hydrocarbons.

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Section: Atr-ftir Spectroscopysupporting

confidence: 90%

Sorption of perfluorooctanoic acid, perfluorooctane sulfonate and perfluoroheptanoic acid on granular activated carbon

et al. 2016

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“…Figure 8 also shows that the capacity of virgin F300 subjected to 50 mA current for 25 h was reduced by 2%. This decrease in performance is likely to have been caused by changes in GAC surface chemistry [14,29], but may have been simply experimental error. Figure 9 also shows the impact of current on the regeneration of F300 loaded with NOM after 5 h of regeneration.…”

Section: Impact Of the Gac Typementioning

confidence: 99%

Electrochemical regeneration of granular activated carbons loaded with phenol and natural organic matter

Narbaitz

Karimi-Jashni

2009

Environmental Technology

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The main objective of this study was to assess the performance of electrochemical regeneration of granular activated carbon via a set of bench-scale experiments using different operating conditions in the regeneration of several different activated carbons loaded with phenol or natural organic matter. The regeneration efficiency can be increased by increasing the charge applied, whether this was achieved by an increase in current or regeneration time. The degree of phenol-adsorption saturation did not significantly affect the regeneration efficiencies. The regeneration efficiencies of the various types of phenol-loaded activated carbon were quite similar despite the differences in their conductivity. The activated carbon exhibiting fully reversible adsorption of phenol had slightly higher regeneration efficiencies than those involving partially irreversible adsorption. Electrochemical regeneration of activated carbon is feasible at a laboratory scale as regeneration efficiencies up to 80% were achieved during electrochemical regeneration of phenol-loaded or natural organic matter-loaded activated carbons.

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“…The regeneration involves desorption and/or degradation of the adsorbed pollutant, restoring the adsorptive capacity of the adsorbent [162][163][164]. The first report on electrochemical regeneration of activated carbon was by Owen and Barry [163] who achieved regeneration efficiencies of up to 61% and suggested further studies on the process.…”

Section: Electrochemical Regenerationmentioning

confidence: 99%

Regeneration strategies for spent solid matrices used in adsorption of organic pollutants from surface water: a critical review

Omorogie

Babalola

Unuabonah

2016

Desalination and Water Treatment

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A B S T R A C TAdsorption is a very important physicochemical process used for several purposes including separation and purification of proteins and in water treatment. This article reviews the various strategies that have been employed in the regeneration of spent adsorbents used in the adsorption of organic pollutants from aqueous solutions. The principles, advantages, disadvantages, and factors influencing each of these techniques are discussed. Future perspectives on the use of these techniques in regeneration process are provided for further studies with the view to make the regeneration process of spent solids more efficient and sustainable.

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Effects of electrochemical treatment of granular activated carbon on surface acid groups and the adsorptive capacity for phenol

Cited by 19 publications

References 6 publications

Sorption of perfluorooctanoic acid, perfluorooctane sulfonate and perfluoroheptanoic acid on granular activated carbon

Sorption of perfluorooctanoic acid, perfluorooctane sulfonate and perfluoroheptanoic acid on granular activated carbon

Electrochemical regeneration of granular activated carbons loaded with phenol and natural organic matter

Regeneration strategies for spent solid matrices used in adsorption of organic pollutants from surface water: a critical review

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