Iron powder, graphite and activated carbon as catalysts for the oxidation of 4-chlorophenol with hydrogen peroxide in aqueous solution

Lücking, F; Köser, H.; Jank, M.; Ritter, Axel

doi:10.1016/s0043-1354(98)00016-5

Cited by 273 publications

(203 citation statements)

References 9 publications

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“…This is attributed to the 4-CP adsorption which reduces the surface active sites available for the H 2 O 2 . Lucking et al (1998) reported the similar results in their adsorption/ oxidation system using GAC as catalyst. But, slight influence of organics adsorption on H 2 O 2 decomposition was observed in the previous researches using iron oxide as catalyst.…”

Section: Comparison Of Modified Activated Carbonssupporting

confidence: 57%

“…Lucking et al (1998) investigated the catalytic role of various activated carbons, certain amount of dissolved iron ion was observed to enhance the oxidation rate of 4-CP in the reaction volume during the oxidation experiment. To determine the importance of homogeneous reaction, the filtrate samples were aged for 24 h and the 4-CP concentration was monitored.…”

Section: Chlorophenol Oxidation 321 Comparison Of Modified Activatmentioning

confidence: 99%

“…A number of researchers (Valentine and Wang, 1998;Miller and Valentine, 1999) with attempt to minimize the leaching of iron ion focused on the efficiency of heterogeneous catalysis for pollutant oxidation. Recently, considering the practical application of the oxidation process, supported iron oxides or granular size solid catalysts, such as graphite and activated carbon, were also studied for their catalytic characteristics (Lucking et al, 1998;Chou and Huang, 1999). In addition, the potential for applying H 2 O 2 to Fenton-like water treatment is primarily restricted to the supply and stability of H 2 O 2 .…”

Section: Introductionmentioning

confidence: 99%

“…These investigations were not only concerned with the factors affecting the catalytic rate, but also directed toward applying this type of reaction for practical purposes, especially in environmental impacts. Recent studies (Lucking et al, 1998;Lin and Lai, 2000) indicated that surface catalyzed reaction of GAC induced by oxidizing agent may lead to contaminant decay in aqueous system. Although GAC adsorption method is effective to the removal of organic compounds, the GAC can get saturated easily in the process, which requires regeneration or complete replacement.…”

Section: Introductionmentioning

confidence: 99%

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Catalytic decomposition of hydrogen peroxide and 4-chlorophenol in the presence of modified activated carbons

et al. 2003

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The objective of this research was to examine the heterogeneous catalytic decomposition of H 2 O 2 and 4-chlorophenol (4-CP) in the presence of activated carbons modified with chemical pretreatments. The decomposition of H 2 O 2 was suppressed significantly by the change of surface properties including the decreased pH pzc modified with oxidizing agent and the reduced active sites occupied by the adsorption of 4-CP. The apparent reaction rate of H 2 O 2 decomposition was dominated by the intrinsic reaction rates on the surface of activated carbon rather than the mass transfer rate of H 2 O 2 to the solid surface. By the detection of chloride ion in suspension, the reduction of 4-CP was not only attributed to the advanced adsorption but also the degradation of 4-CP. The catalytic activity toward 4-CP for the activated carbon followed the inverse sequence of the activity toward H 2 O 2 , suggesting that acidic surface functional group could retard the H 2 O 2 loss and reduce the effect of surface scavenging resulting in the increase of the 4-CP degradation efficiency. Few effective radicals were expected to react with 4-CP for the strong effect of surface scavenging, which could explain why the degradation rate of 4-CP observed in this study was so slow and the dechlorination efficiency was independent of the 4-CP concentration in aqueous phase. Results show that the combination of H 2 O 2 and granular activated carbon (GAC) did increase the total removal of 4-CP than that by single GAC adsorption.

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Section: Comparison Of Modified Activated Carbonssupporting

confidence: 57%

Section: Chlorophenol Oxidation 321 Comparison Of Modified Activatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Catalytic decomposition of hydrogen peroxide and 4-chlorophenol in the presence of modified activated carbons

et al. 2003

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“…An alternative strategy is to completely eliminate the presence of iron through the use of heterogeneous catalysts with no metallic phase, but with the adequate ability to promote the formation of the oxidizing agent. Recent results show that activated carbons are efficient in the degradation of some dissolved organic pollutants in the presence of hydrogen peroxide [10][11][12][13], providing that the carbon surface possesses suitable chemical properties. Activated carbons are known catalysts for hydrogen peroxide decomposition through the formation of hydroxyl radicals.…”

Section: Introductionmentioning

confidence: 99%