Carbon-Catalyzed Oxidative Coupling of Phenolic Compounds

Osei-Twum, Emmanuel Y.; Abuzaid, Nabil S.; Nahkla, G.

doi:10.1007/s001289900074

Cited by 17 publications

(5 citation statements)

References 10 publications

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“…Il n'est donc pas surprenant de constater la formation d'espe `ces de hauts poids mole ´culaires a `laquelle ce type de me ´canisme peut facilement mener. Bien que de structures diffe ´rentes, des dime `res et des trime `res aromatiques hydroxyle ´s de la famille des diphe ´nyle ´thers, des biphe ´nyles, des dibenzofuranes et des dibenzodioxines ainsi que d'autres espe `ces aromatiques polycycliques ont e ´te ´identifie ´s au cours de l'e ´limination du phe ´nol en phase aqueuse par : l'oxyge `ne mole ´culaire en conditions supercritiques [20] ; le re ´actif de Fenton [21] ; adsorption sur charbon actif en milieu oxydant [22]. 9H-xanthe ´n-9-one soit une hydroxy-9H-fluore ´n-9-one (PM = 196 uma).…”

Section: Composition De La Phase Adsorbe´eunclassified

Nature du dépôt formé au cours de l’oxydation en voie humide catalysée du phénol

Keav

Martin

Barbier

et al. 2010

Comptes Rendus. Chimie

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Section: Composition De La Phase Adsorbe´eunclassified

Nature du dépôt formé au cours de l’oxydation en voie humide catalysée du phénol

Keav

Martin

Barbier

et al. 2010

Comptes Rendus. Chimie

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“…In addition, the electron donating methyl groups on 1,2,4-trimethylbenzene results in stronger interaction with the carbon structure. 47,48 Following breakthrough, the effluent concentration of the lower boiling point species (n-butanol, n-butyl acetate, 2-heptanone, and 2-butoxyethanol) rapidly increased to beyond their influent concentrations (62.5 ppmv), generally consistent in the order of increasing boiling point. After that, their concentrations began to decrease until they dropped to their influent concentration.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

Adsorption and Desorption of Mixtures of Organic Vapors on Beaded Activated Carbon

Wang

Lashaki

Fayaz

et al. 2012

Environ. Sci. Technol.

106

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Hydroxyapatite nanoparticles (nHAP) have been widely used to remediate soil and wastewater contaminated with metals and radionuclides. However, our understanding of nHAP transport and fate is limited in natural environments that exhibit significant variability in solid and solution chemistry. The transport and retention kinetics of Alizarin red S (ARS)-labeled nHAP were investigated in water-saturated packed columns that encompassed a range of humic acid concentrations (HA, 0-10 mg L(-1)), fractional surface coverage of iron oxyhydroxide coatings on sand grains (λ, 0-0.75), and pH (6.0-10.5). HA was found to have a marked effect on the electrokinetic properties of ARS-nHAP, and on the transport and retention of ARS-nHAP in granular media. The transport of ARS-nHAP was found to increase with increasing HA concentration because of enhanced colloidal stability and the reduced aggregate size. When HA = 10 mg L(-1), greater ARS-nHAP attachment occurred with increasing λ because of increased electrostatic attraction between negatively charged nanoparticles and positively charged iron oxyhydroxides, although alkaline conditions (pH 8.0 and 10.5) reversed the surface charge of the iron oxyhydroxides and therefore decreased deposition. The retention profiles of ARS-nHAP exhibited a hyperexponential shape for all test conditions, suggesting some unfavorable attachment conditions. Retarded breakthrough curves occurred in sands with iron oxyhydroxide coatings because of time-dependent occupation of favorable deposition sites. Consideration of the above effects is necessary to improve remediation efficiency of nHAP for metals and actinides in soils and subsurface environments.

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“…Vidic et al (1997) and Uranowski et al (1998) observed that the binding of phenolics to activated carbon was promoted by the presence of molecular oxygen. Figure 11 illustrates a mechanism that was proposed by Osei-Twum et al (1996) to account for such coupling.…”

Section: Covalent Reactions Of the Adsorbatementioning

confidence: 99%

“…Reaction scheme for oxidative coupling of phenols, forming dimers and larger species that presumably have much lower solubility in water. Scheme redrawn based on a concept by Osei-Twum et al (1996).…”

Section: Covalent Reactions Of the Adsorbatementioning

confidence: 99%

Cellulosic substrates for removal of pollutants from aqueous systems: A review. Part 4. Dissolved petrochemical compounds

Hubbe

Park

2014

BioRes

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Dissolved petroleum-based compounds, e.g. solvents, pesticides, and chemical reagents such as phenolic compounds, can pose significant hazards to the health of humans and ecosystems when they are released to the environment. This review article considers research progress related to the biosorption and removal of such contaminants from water using cellulose-derived materials. The fact that cellulosic materials show promise in removing such sparingly soluble materials from water lends support to a hypothesis that lignocellulosic materials can be broadspectrum adsorbents. Also, the hydrophobic character and sorption capabilities can be increased through thermal treatment and the preparation of activated carbons. As shown in many studies, the efficiency of uptake of various petrochemical products from water also can be increased by chemical treatments of the adsorbent. It appears that more widespread adoption of biosorption as a means of removing petroleumbased products from water has been limited by concerns about the used, loaded biosorbent. Disposal or regeneration options that need to be considered more in future research include enzymatic and biological treatments, taking advantage of the fact that the biosorbent material is able to collect, immobilize, and concentrate various contaminants in forms that are suited for a number of packed bed or batch-type degradative treatment systems.

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Carbon-Catalyzed Oxidative Coupling of Phenolic Compounds

Cited by 17 publications

References 10 publications

Nature du dépôt formé au cours de l’oxydation en voie humide catalysée du phénol

Nature du dépôt formé au cours de l’oxydation en voie humide catalysée du phénol

Adsorption and Desorption of Mixtures of Organic Vapors on Beaded Activated Carbon

Cellulosic substrates for removal of pollutants from aqueous systems: A review. Part 4. Dissolved petrochemical compounds

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