Adsorption Isotherms of Phenolic Compounds from Aqueous Solutions onto Activated Carbon Fibers

Juang, Ruey-Shin; Wu, Feng‐Chin; Tseng, Ru‐Ling

doi:10.1021/je950238g

Cited by 121 publications

(66 citation statements)

References 18 publications

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“…Recently, Akgerman and Zardkoohi (1996) studied the adsorption of phenolic compounds on fly ash. Juang et al (1996) had established the adsorption isotherms of phenols onto activated carbon fibers at 303 K. The results obtained by frontal analysis chromatography compare generally well with batch measurements.…”

Section: Introductionmentioning

confidence: 68%

Adsorption Isotherms of Phenol and 4-Chlorophenol on Petroleum Asphaltenes

Jaoui¹,

Achard²,

Hasnaoui³

et al. 1998

Rev. Inst. Fr. Pét.

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Les isothermes d'adsorption du phŽnol et du 4-chlorophŽnol en solution dans l'eau sur des asphalt•nes floculŽs en masse et sur des asphalt•nes dŽposŽs sur de la silice ont ŽtŽ dŽterminŽs par analyse chromatographique frontale ˆ 293, 298, 303 et 308 K. L'adsorption sur des asphalt•nes floculŽs en masse Žtait la plus importante avec des isothermes correspondant ˆ un mŽcanisme de Freundlich. La quantitŽ ŽlevŽe de phŽnols adsorbŽs sugg•re une migration possible des molŽcules du phŽnol ˆ travers la structure peu compacte des asphalt•nes. Les isothermes observŽs dans le cas de silice tapissŽe d'asphalt•nes ont montrŽ que l'adsorption se produit en deux Žtapes correspondant probablement ˆ deux organisations diffŽrentes des molŽcules de solutŽ ˆ la surface. ADSORPTION ISOTHERMS OF PHENOL AND 4-CHLOROPHENOL ON PETROLEUM ASPHALTENESThe adsorption isotherms for phenol and 4-chlorophenol from water onto asphaltenes flocculated in bulk and asphaltenes deposited on silica were established by frontal analysis chromatography at 293, 298, 303, and 308 K. The adsorption was more important with asphaltenes flocculated in bulk and corresponded to a Freundlich isotherm mechanism. The high adsorbed amount of phenols suggests possible migration of phenols through the loose asphaltene structure. Isotherms observed with the silica coated by asphaltenes showed that adsorption occurs in two stages corresponding probably to two different organizations of solute molecules at the surface. ADSORCIîN DEL FENOL Y DEL 4-CLOROFENOL EN LOS ASFALTENOS PETROLEROSLos isotermos de adsorci-n del fenol y del 4-clorofenol en soluci-n en el agua respecto a los asfaltenos floculados en masa y, asimismo, en los asfaltenos depositados sobre s'lice, se han determinado por an ‡lisis cromatogr ‡fico frontal a 293, 298, 303 y 308 K. La adsorci-n en los asfaltenos floculados en masa fue la m ‡s importante con los isotermos correspondientes a un mecanismo de Freundlich. La elevada proporci-n de fenoles adsorbidos viene a sugerir una posible migraci-n de las molŽculas del fenol a travŽs de la estructura poco compacta de los

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Section: Introductionmentioning

confidence: 68%

Adsorption Isotherms of Phenol and 4-Chlorophenol on Petroleum Asphaltenes

Jaoui¹,

Achard²,

Hasnaoui³

et al. 1998

Rev. Inst. Fr. Pét.

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“…The results obtained for the experimental studies were fitted for Langmuir isotherm [2,15] where q e is the adsorption capacity (mg/g), C e is equilibrium concentration of adsorbate (mg/L), K L and b are Langmuir constants, and q m is the Langmuir monolayer adsorption capacity.…”

Section: F Langmuir Isothermmentioning

confidence: 99%

Adsorption of O-Cresol in Landfill Leachate Using Activated Carbon

Shabiimam¹,

Dikshit²

2012

IJESD

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Abstract-The adsorptive removal of o-cresol from dilute aqueous solutions was carried using commercial activated carbon. Batch mode studies were performed by varying parameters such as pH, adsorbent dosage and time. It was found that adsorption with activated carbon can remove up to 95% of o-cresol from the wastewater within 10 minutes. The optimum process variables of this adsorption of o-cresol were found as pH 8 and adsorption dosage 5 g/L. The adsorption followed Langmuir Isotherm.Index Terms-Activated carbon, adsorption, freundlich and langmuir isotherm, o-Cresol.

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“…Chlorophenols are a class of widely occurring water pollutants released from industrial sources, including oil refining, coal conversion, and petrochemical production (Juang et al 1996;Banat et al 2000;Wang et al 2007;Shah et al 2011;Yousef et al 2011). They are also widely used as intermediates in the production of dyes, plastics, pharmaceuticals, pesticides, and insecticides (Radhika and Palanivelu 2006;Anbia and Lashgari 2009;Lua and Jia 2009;Liu et al 2010;Yang et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

Yang

Cheng

2016

Environ Sci Pollut Res

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Sorption of 2-chlorophenol (2-CP), 2,4-dichlorophenol (2,4-DCP), and 2,4,6-trichlorophenol (2,4,6-TCP) on a range of dealuminated zeolites were investigated to understand the mechanism of their sorption on microporous minerals, while the influence of common metal cations, solution pH, and humic acid was also studied. Sorption of chlorophenols was found to increase with the hydrophobicity of the sorbates and that of the microporous minerals, indicating the important role of hydrophobic interactions, while sorption was also stronger in the micropores of narrower sizes because of greater enhancement of the dispersion interactions. The presence of metal cations could enhance chlorophenol sorption due to the additional electrostatic attraction between metal cations exchanged into the mineral micropores and the chlorophenolates, and this effect was apparent on the mineral sorbent with a high density of surface cations (2.62 sites/nm 2 ) in its micropores. Under circum-neutral or acidic conditions, neutral chlorophenol molecules adsorbed into the hydrophobic micropores through displacing the Bloosely bound^water molecules, while their sorption was negligible under moderately alkaline conditions due to electrostatic repulsion between the negatively charged zeolite framework and anionic chlorophenolates. The influence of humic acid on sorption of chlorophenols on dealuminated Y zeolites suggests that its molecules did not block the micropores but created a secondary sorption sites by forming a Bcoating layer^on the external surface of the zeolites. These mechanistic insights could help better understand the interactions of ionizable chlorophenols and metal cations in mineral micropores and guide the selection and design of reusable microporous mineral sorbents for sorptive removal of chlorophenols from aqueous stream.

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Adsorption Isotherms of Phenolic Compounds from Aqueous Solutions onto Activated Carbon Fibers

Cited by 121 publications

References 18 publications

Adsorption Isotherms of Phenol and 4-Chlorophenol on Petroleum Asphaltenes

Adsorption Isotherms of Phenol and 4-Chlorophenol on Petroleum Asphaltenes

Adsorption of O-Cresol in Landfill Leachate Using Activated Carbon

Sorption of chlorophenols on microporous minerals: mechanism and influence of metal cations, solution pH, and humic acid

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