Analysis of the kinetics of regeneration of bidispersed activated granular carbon, by supercritical carbon dioxide

Bensebia, Bensaber; Dahmani, Abdallah; Bensebia, Ouahida; Barth, Danielle

doi:10.1016/j.supflu.2010.04.005

Cited by 21 publications

(3 citation statements)

References 34 publications

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“…The yield of activated carbon regeneration using traditional regeneration techniques was found to be between 70% and 95% but additional technologies are required to separate the solute from solvents or for carbon drying, these processes having high energy consumption . Similar yields were obtained when supercritical technology was used, avoiding the use of further separation steps …”

Section: Introductionmentioning

confidence: 94%

“…29 -31 Similar yields were obtained when supercritical technology was used, avoiding the use of further separation steps. 32 Thus, the supercritical technique seems to be the most suitable technology, giving the possibility to recover both the activated carbon and the phenolic compounds in the same treatment stage. 27,28 The regeneration process was found to be dependent on temperature, pressure, flow of the CO 2 , the co-solvent and the way the process is done.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO₂

Carmona

Garcı́a

Carnicer

et al. 2013

J of Chemical Tech & Biotech

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BACKGROUND The adsorption and desorption of phenol, 2‐chlorophenol (2‐CPh), 4‐chlorophenol (4‐CPh) and 2,4‐dichlorophenol (2,4‐DCPh) were carried out using granular activated carbon (GAC) as adsorbent and supercritical CO2 as regenerant. Adsorption studies at three different temperatures were fitted by using two thermodynamic adsorption models, Langmuir and Toth. The GAC regeneration by CO2 at four different pressures and two temperatures was studied and the design basic parameters were found. RESULTS The Toth model fitted the experimental data better and thermodynamic properties indicated that this adsorption process was spontaneous, feasible and exothermic. Values of standard enthalpy lower than 40 kJ mol‐1 confirmed that adsorption processes were carried out by physical adsorption. It was also observed that the higher the pressure the higher the regeneration efficiency due to the increase in solvent density. CONCLUSION GAC presented high selectivity for these substituted phenols and the order of adsorption was 2,4‐DCPh > 4‐CPh > 2CPh > phenol. Supercritical technology was able to regenerate the exhausted GAC, achieving yields comparable with those exhibited by traditional technologies but avoiding additional separation processes. The effective diffusivities of phenols followed the order phenol > 2‐CPh≅4‐CPh > 2,4‐DCPh. © 2013 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO₂

Carmona

Garcı́a

Carnicer

et al. 2013

J of Chemical Tech & Biotech

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“…However, with the addition of 10 vol% of ethanol as co-solvent, the extraction efficiency could reach 98%, and the spent organoclays can be well regenerated [187]. In a separate study by Bensebia et al [198], they concluded that the particle size of the adsorbent do play a big role in determining the time of desorption in SCF regeneration while resistance due to external transfer and axial dispersion were negligible in the desorption of m-xylene from GAC using same technique.…”

Section: Scfs Regenerationmentioning

confidence: 99%

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

Omorogie

Babalola

Unuabonah

2014

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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Synthesis of nanostructured materials using supercritical CO2: Part I. Physical transformations

2011

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Analysis of the kinetics of regeneration of bidispersed activated granular carbon, by supercritical carbon dioxide

Cited by 21 publications

References 34 publications

Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO₂

Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO₂

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

Synthesis of nanostructured materials using supercritical CO2: Part I. Physical transformations

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Analysis of the kinetics of regeneration of bidispersed activated granular carbon, by supercritical carbon dioxide

Cited by 21 publications

References 34 publications

Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO2

Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO2

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

Synthesis of nanostructured materials using supercritical CO2: Part I. Physical transformations

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Product

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Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO₂

Adsorption of phenol and chlorophenols onto granular activated carbon and their desorption by supercritical CO₂