Impact of surface properties of activated carbons on oxidative coupling of phenolic compounds

Vidić, Radisav D.; Tessmer, Charles H.; Uranowski, Lois J.

doi:10.1016/s0008-6223(97)00071-7

Cited by 108 publications

(49 citation statements)

References 21 publications

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“…Highest affinity with sorbates is thus not always desirable because it may decrease their ability for regeneration. The surface groups of AC can enhance oxidative coupling of organic molecules (aromatic hydrocarbons) to form aromatic oligomers, which irreversibly adsorbed on the carbon surface [92][93][94][95]. Hence, the design of optimal AC adsorbents should provide suitable textural properties and surface groups.…”

Section: Adsorptionmentioning

confidence: 99%

“…The highest phenol feed concentration of 10 g/ L not only suppressed the carbon combustion providing short saturation time (2 h) and densely crowed phenol surface, but also produced a considerable irreversible weight gain as reported above. Activated carbon is well known to catalyse phenol coupling reactions [92][93][94][95] forming condensation products that can strongly adsorb onto the carbon. Not surprisingly, a batch study testing the CI carbon on phenol WAO [61] deduced from liquid and gas phase carbon balances the deposit of important amounts of carbonaceous matter on the carbon surface.…”

Section: Catalystmentioning

confidence: 99%

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Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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Section: Adsorptionmentioning

confidence: 99%

Section: Catalystmentioning

confidence: 99%

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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“…The number and strength of those groups influence the apparent acidity or basicity of the carbon surface. Moreover, the presence of a few percent of inorganic matter from the organic precursor such as coal or wood is also considered important for the performance of carbons, especially when they are used as catalyst supports (7).…”

Section: Introductionmentioning

confidence: 99%

Effect of pH and Surface Chemistry on the Mechanism of H2S Removal by Activated Carbons

Adib

Bagreev

Bandosz

1999

Journal of Colloid and Interface Science

152

167

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“…In this study, the oxidative coupling was inhibited under anoxic conditions. This result suggests that reactive oxygen species generated on AC surface involve in the generation of phenoxyl radical 7) . Phenoxyl radical reacts with AC surface and causes a covalent binding with AC surface via dechlorination reaction.…”

Section: Discussionmentioning

confidence: 82%

Oxidative coupling and dechlorination of aromatic compounds on modified activated carbon

Iwanaga

Amano

Aikawa

et al. 2013

TANSO

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Dechlorination by oxidative coupling during the adsorption of mono-chlorophenols (mono-CPs) onto activated carbon (AC) was investigated, and the effects of various parameters such as amount of dissolved oxygen, surface structure and temperature of solution on dechlorination amount were examined. Under anoxic conditions, the amounts of adsorption and dechlorination for mono-CPs decreased compared to conditions where oxygen is present. This result indicated that the oxidative coupling would depend on dissolved oxygen. It is known that dissolved oxygen was transformed into reactive oxygen species on the AC surface. Therefore, we propose that reactive oxygen species originating from dissolved oxygen react with chlorophenol, causing dechlorination and the oxidative coupling by radical reaction. The introduction of pyrrole-and/or pyridine-like structures in the carbon by NH 3 gas treatment at temperatures above 700 °C promoted the reduction of dissolved oxygen, which caused the increase in the amount of dechlorination. On the other hand, HNO 3 oxidation of AC noticeably decreased the amount of dechlorination, indicating that the acidic functional groups possessing an electron-withdrawing ability inhibited the reduction of dissolved oxygen on the AC surface. It was also found that the amount of dechlorination and its rate were influenced by the temperature of the solution.

show abstract

Impact of surface properties of activated carbons on oxidative coupling of phenolic compounds

Cited by 108 publications

References 21 publications

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Effect of pH and Surface Chemistry on the Mechanism of H2S Removal by Activated Carbons

Oxidative coupling and dechlorination of aromatic compounds on modified activated carbon

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