Chemical oxidation of chlorinated organics by hydrogen peroxide in the presence of sand

Ravikumar, Joseph X.; Gurol, Mirat D.

doi:10.1021/es00052a009

Cited by 206 publications

(97 citation statements)

References 7 publications

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“…In order to cover the inner walls of the capillary with a thin layer of Pd, an electroless plating solution (40 mL) was continuously passed at constant temperature of 50°C and 0. 5 2730 In order to carry out electroless plating at a controlled temperature with constant feeding of the solution, a water bath and peristaltic pump were used, respectively. For Pt, a plating solution (40 mL) containing 0.003 M [Pt(NH 3 ) 4 ]Cl 2 , 0.1 M NH 3 , and 0.1 M hydrazine monohydrate was fed under a similar procedure at 70°C.…”

Section: Methodsmentioning

confidence: 99%

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

Javaid

Qazi

Kawasaki

2015

Bulletin of the Chemical Society of Japan

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The decomposition of hydrogen peroxide (H 2 O 2 ) was studied using a silica capillary tube (o.d. 0.45 mm, i.d. 0.33 mm, length 1000 mm) coated with a thin palladium (Pd) or platinum (Pt) layer. The inner walls of the capillary were coated with a homogenous thin layer of metal by electroless plating. This metal-coated capillary provided rapid and continuous decomposition of H 2 O 2 at room temperature within a residence time of 9.6 s, simply by passing the solution through the capillary. A capillary without Pd or Pt coating was unable to decompose H 2 O 2 even at 50°C. Pt proved to be a better catalyst than Pd. We also studied the effect of temperature, pH, concentration of H 2 O 2 and the residence time on decomposition of H 2 O 2 .

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Section: Methodsmentioning

confidence: 99%

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

Javaid

Qazi

Kawasaki

2015

Bulletin of the Chemical Society of Japan

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“…The application of Fenton-like chemical oxidation process for remediation of contaminated soils and treatment of wastewater has gained more attention in last decade (Ravikumar and Gurol, 1994;Kong et al, 1998;Lu et al, 2002). However the disadvantage of FentonÕs reagent is that the homogeneous catalyst cannot be retained in the process thus causing additional water pollution.…”

Section: Introductionmentioning

confidence: 99%

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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“…Deliverability of natural iron 66 catalyst as a means of minimizing the extrinsic chemical addition was examined 67 extensively by many researchers (Ravikumar and Gurol, 1994 Fenton's reaction rate at pH = 5, consuming more H 2 O 2 than without fulvic acid (Voelker 82 and Sulzberger, 1996). Sun and Pignatello (1992) solutions, the other three sets of the deionized water-diluted solutions were mixed with 125…”

mentioning

confidence: 99%

Citric acid-modified Fenton’s reaction for the oxidation of chlorinated ethylenes in soil solution systems

Seol

Javandel

2008

Chemosphere

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Chemical oxidation of chlorinated organics by hydrogen peroxide in the presence of sand

Cited by 206 publications

References 7 publications

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

Efficient and Continuous Decomposition of Hydrogen Peroxide Using a Silica Capillary Coated with a Thin Palladium or Platinum Layer

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

Citric acid-modified Fenton’s reaction for the oxidation of chlorinated ethylenes in soil solution systems

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