Solvent regeneration of activated carbon

Cooney, David O.; Nagerl, Andrew; Hines, Anthony L.

doi:10.1016/0043-1354(83)90136-7

Cited by 104 publications

(61 citation statements)

References 4 publications

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“…21) In the present study, the solvent extraction process was employed to regenerate the carbon, as it is more effective than other methods such as a the thermal treatment or a chemical process. 22,23) Several solvents are used to remove adsorbates from activated carbon, including sodium hydroxide, ethanol, benzene and acetone. In this study, 0.5 mol/dm 3 sodium hydroxide solution was used to remove chloride, chlorine and small amounts of iodine remaining on the activated carbon surface.…”

Section: Regeneration Of Activated Carbonmentioning

confidence: 99%

Simultaneous Recovery of Gold and Iodine from the Waste Rinse Water of the Semiconductor Industry Using Activated Carbon

et al. 2012

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This research work focused on the simultaneous recovery of gold (40.5 mg/dm 3 ) and iodine (748 mg/dm 3 ) from the waste rinse water of the semiconductor industry using activated carbon. A batch study was conducted to optimize process parameters, such as contact time and carbon dose, for the recovery of gold and iodine from the waste water. The loading capacity of the activated carbon for adsorption of gold and iodine was found to be 33.5 mg Au/g carbon and 835 mg I 2 /g carbon, respectively. Gold was found to exist on the activated charcoal surface in two forms: ionic gold and elemental gold. Aqua regia was used to convert metallic gold to its ionic form, and the iodine and the small amount of ionic gold were removed from the activated carbon by elution with aqua regia. Gold was recovered from the eluate by reduction with hydrazine. Iodine from the diluted aqua regia was then precipitated by adding sodium hydrosulfite (Na 2 S 2 O 4 ). A complete process flow sheet was developed to recover both gold and iodine from the waste water of the semiconductor industry, which conserves the resources while meeting environmental pollution requirements.

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Section: Regeneration Of Activated Carbonmentioning

confidence: 99%

Simultaneous Recovery of Gold and Iodine from the Waste Rinse Water of the Semiconductor Industry Using Activated Carbon

et al. 2012

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“…A general description of the closed-loop stripping process and a detailed report of the extraction procedure of the charcoal filter trap with organic solvents were given by Grob (1973), Grob & Grob (1974), Grob et al (1975), Grob & Ztircher (1976), and Cooney et al (1983), In our work, the charcoal filters were eluted with 30-~1 di-chloro-methane.…”

Section: Methodsmentioning

confidence: 99%

Pheromones in marine algae: A technical approach

Gassmann

Müller

Fritz

1995

Helgolander Meeresunters

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It is now well known that many marine organisms use low-molecular volatile substances as signals, in order to coordinate activities between different individuals. The study of such pheromones requires the isolation and enrichment of the secretions from undisturbed living cells or organisms over extended periods of time. The Grob-Hersch extraction device, which we describe here, avoids adverse factors for the biological materials such as strong water currents, rising gas bubbles or chemical solvents. Furthermore, the formation of sea-water spray is greatly reduced. The application of this technique for the isolation of pheromones of marine algae and animals is described.

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“…In these methods, a rinse step must be carried out between the regeneration and the adsorption steps because the presence of the regenerating agent within the structure of the adsorbent hinders the subsequent adsorption [35][36][37][38]. In a similar way to SCCO2 regeneration, the regenerating agents must reach all the micropores to efficiently regenerate the exhausted adsorbents, what makes the rinse step trickier.…”

Section: Mass Transfer Limitations: Effect Of Time Flow and Pressurementioning

confidence: 99%

“…In these methods, a rinse step must be carried out between the regeneration and the adsorption steps because the presence of the regenerating agent within the From a technical point of view, the access of SCCO 2 to the inner micropores does not mean a problem for the regeneration procedure, in contrast to other regeneration methods like solvent regeneration or NaOH regeneration. In these methods, a rinse step must be carried out between the regeneration and the adsorption steps because the presence of the regenerating agent within the structure of the adsorbent hinders the subsequent adsorption [35][36][37][38]. In a similar way to SCCO 2 regeneration, the regenerating agents must reach all the micropores to efficiently regenerate the exhausted adsorbents, what makes the rinse step trickier.…”

Section: Mass Transfer Limitations: Effect Of Time Flow and Pressurementioning

confidence: 99%

Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol

et al. 2018

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory. Abstract:The properties of supercritical CO 2 (SCCO 2 ) and supercritical water (SCW) turn them into fluids with a great ability to remove organic adsorbates retained on solids. These properties were used herein to regenerate an activated carbon fiber (ACF) saturated with a pollutant usually contained in wastewater and drinking water, phenol. Severe regeneration conditions, up to 225 bar and 400 • C, had to be employed in SCCO 2 regeneration to break the strong interaction established between phenol and the ACF. Under suitable conditions (regeneration temperature, time, and pressure, and flow of SCCO 2 ) the adsorption capacity of the exhausted ACF was completely recovered, and even slightly increased. Most of the retained phenol was removed by thermal desorption, but the extra percentage removed by extraction allowed SCCO 2 regeneration to be significantly more efficient than the classical thermal regeneration methods. SCCO 2 regeneration and SCW regeneration were also compared for the first time. The use of SCW slightly improved regeneration, although SCW pressure was thrice SCCO 2 pressure. The pathways that controlled SCW regeneration were also investigated.

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Solvent regeneration of activated carbon

Cited by 104 publications

References 4 publications

Simultaneous Recovery of Gold and Iodine from the Waste Rinse Water of the Semiconductor Industry Using Activated Carbon

Simultaneous Recovery of Gold and Iodine from the Waste Rinse Water of the Semiconductor Industry Using Activated Carbon

Pheromones in marine algae: A technical approach

Supercritical Regeneration of an Activated Carbon Fiber Exhausted with Phenol

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