THE ACTION OF Co60 GAMMA RAYS AND OF FENTON'S REAGENT ON AQUEOUS BROMAL HYDRATE SOLUTIONS

1957 ◽  
Vol 35 (12) ◽  
pp. 1475-1486 ◽  
Author(s):  
R. J. Woods ◽  
J. W. T. Spinks
Keyword(s):  
Hydrogen Peroxide ◽  
Dose Rate ◽  
Gamma Rays ◽  
Hydrobromic Acid ◽  
Ferrous Sulphate ◽  
Fenton’S Reagent ◽  
Chain Reaction ◽  
Fenton's Reagent ◽  
A Chain ◽  
Co60 Gamma

Aqueous bromal hydrate solutions have been irradiated with Co60 gamma rays and the production of acid measured. The effect of bromal hydrate concentration, dose rate, pH, and temperature upon the yield of acid has been determined. Major products of the radiolysis have been identified and are compared with those formed when aqueous bromal hydrate solutions are treated with Fenton's reagent, a mixture of hydrogen peroxide and ferrous sulphate solutions. It has been shown that Fenton's reagent will initiate a chain reaction in aqueous bromal hydrate solutions which produces hydrobromic acid.

IRRADIATION OF ONE MOLAR AQUEOUS CHLORAL HYDRATE SOLUTION WITH Co60-GAMMA-RAYS AND BETATRON X RAYS

1953 ◽  
Vol 31 (12) ◽  
pp. 1164-1172 ◽  
Author(s):  
G. R. Freeman ◽  
A. B. Van Cleave ◽  
J. W. T. Spinks
Keyword(s):  
Gamma Rays ◽  
Chloral Hydrate ◽  
Specific Yield ◽  
Square Root ◽  
X Rays ◽  
Chain Reaction ◽  
Peak Energy ◽  
Γ Rays ◽  
A Chain ◽  
Co60 Gamma

The production of acid by irradiation of 1 M chloral hydrate solutions is proportional to the dose at a given dose rate. The specific yield is the same for Co60 γ-rays as for 23 Mev. peak energy X rays and is a linear function of the inverse of the square root of the close rate. The reaction is apparently a chain reaction.

IRRADIATION OF AQUEOUS CHLORAL HYDRATE SOLUTIONS WITH Co60 GAMMA-RAYS: AVERAGE LIFETIME OF THE FREE RADICAL CHAINS

1954 ◽  
Vol 32 (3) ◽  
pp. 322-326 ◽  
Author(s):  
G. R. Freeman ◽  
A. B. Van Cleave ◽  
J. W. T. Spinks
Keyword(s):  
Free Radical ◽  
Hydrochloric Acid ◽  
Gamma Rays ◽  
Chloral Hydrate ◽  
Average Lifetime ◽  
X Rays ◽  
Chain Reaction ◽  
Radical Chain ◽  
A Chain ◽  
Co60 Gamma

When aqueous one molar chloral hydrate solutions are irradiated with X rays or gamma-rays, hydrochloric acid is produced. The reaction appears to be a chain reaction. The average free radical chain lifetime, as determined using a rotating sector, is approximately 0.1 sec.

Coagulation of textile secondary effluents with Fenton's reagent

1997 ◽  
Vol 36 (12) ◽  
pp. 215-222 ◽  
Author(s):  
Shyh-Fang Kang ◽  
Huey-Min Chang
Keyword(s):  
Hydrogen Peroxide ◽  
Cod Removal ◽  
Color Removal ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Effluent Standards ◽  
Secondary Effluents ◽  
Removal Efficiencies

This study was designed to use both artificial and real textile secondary effluents to evaluate (1) the COD and color removal efficiencies for ferrous coagulation and Fenton's coagulation, and (2) the feasibility of using hydrogen peroxide to improve ferrous coagulation to meet more stringent effluent standards. The results indicate that the optimum pHs for both ferrous coagulation and Fenton's preoxidation processes range between 8.0–10 and 3.0–5.0, respectively. The rate for color removal is faster than that for COD removal in the Fenton's preoxidation process. The removals of COD and color are mainly accomplished during Fenton's preoxidation step. The ratio of COD removal for Fenton's coagulation versus ferrous coagulation, given the same ferrous dosage, ranges from 1.4 to 2.3, and it ranges from 1.1 to 1.9 for color removal, using two effluent samples. Therefore, using hydrogen peroxide can enhance the ferrous coagulation, and this ensures more stringent effluent standards of COD and color are met.

Effect of Contaminant Hydrophobicity in the Treatment of Contaminated Soils by Catalyzed H2O2 Propagations (Modified Fenton’s Reagent)

2008 ◽  
Vol 11 (2) ◽  
Author(s):  
Richard J. Watts ◽  
Tanya M. Haeri-McCarroll ◽  
Amy L. Teel
Keyword(s):  
Hydrogen Peroxide ◽  
Contaminated Soils ◽  
Fenton’S Reagent ◽  
Fenton's Reagent

AbstractThe effect of contaminant hydrophobicity on hydrogen peroxide dosage requirements in the treatment of contaminated soils using catalyzed H

The effects of high dose rates of ionizing radiations on solutions of iron and cerium salts

1960 ◽  
Vol 255 (1283) ◽  
pp. 490-508 ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Dose Rate ◽  
Ferrous Sulphate ◽  
High Dose ◽  
Oh Radicals ◽  
Dose Rates ◽  
Reaction Zones ◽  
Constant Dose ◽  
Ceric Sulphate ◽  
Ionizing Radiations

The electron beam generated by a 15 MeV linear accelerator has been employed to induce reactions in aerated aqueous solutions of 1 to 25 mM ferrous sulphate, and of 0⋅1 to 1 mM ceric sulphate. The radiation was delivered in pulses of 1⋅3 μ s duration and over a range of dose rates from 0⋅5 to 20000 rads/pulse. Radiation yields at constant dose rate were compared with the aid of a chemical dose monitor. A system of two thin, widely spaced, irradiation vessels was employed to determine the variation of yield of any one system over successive known ranges of dose rate. The yield of ferric sulphate in the iron system was found to decrease with increasing dose rate in the range 0⋅01 to 10 krads/pulse by an overall factor of 0⋅85, and was appreciably dependent on the initial concentrations of dissolved oxygen and of ferrous sulphate at high dose rates. Yields of hydrogen and of hydrogen peroxide were practically independent of dose rate. The observations have been interpreted on the basis of inter-radical reactions which occur when the reaction zones of neighbouring clusters overlap. The following reactions can account for all the data: OH + Fe 2+ → Fe 3+ + OH ¯ , (1) H + O 2 → HO 2 , (2) H + OH → H 2 O. (7) The values k 1 / k 7 = 0⋅0062, and k 2 / k 7 = 0⋅22 are reasonably consistent with the observations. In the ceric sulphate system the yield of cerous sulphate increases progressively over the range 0⋅01 to 10 krads/pulse by an overall factor of 1⋅4. The data accord with the view that at high dose rates OH radicals react with them selves ultimately to form hydrogen peroxide, in competition with their normal reaction with cerous sulphate.

Ascorbic acid and hydrogen peroxide (Fenton's reagent) induced changes in gelatin systems

2003 ◽  
Vol 17 (3) ◽  
pp. 321-326 ◽  
Author(s):  
Asgar Farahnaky ◽  
David A Gray ◽  
John R Mitchell ◽  
Sandra E Hill
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Induced Changes

Study of the decomposition of four commercially available hydrogen peroxide solutions by Fenton's reagent

1997 ◽  
Vol 69 (5) ◽  
pp. 1052-1056 ◽  
Author(s):  
Brian K. Aldershof ◽  
Ronald M. Dennis ◽  
Craig J. Kunitsky
Keyword(s):  
Hydrogen Peroxide ◽  
Fenton’S Reagent ◽  
Fenton's Reagent

scholarly journals Comparison of Landfill Leachate Treatment Efficiency Using the Advanced Oxidation Processes

2013 ◽  
Vol 39 (2) ◽  
pp. 107-115 ◽  
Author(s):  
Barbara Pieczykolan ◽  
Izabela Płonka ◽  
Krzysztof Barbusiński ◽  
Magdalena Amalio-Kosel
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compounds ◽  
Advanced Oxidation Processes ◽  
Potassium Dichromate ◽  
Advanced Oxidation ◽  
Fenton’S Reagent ◽  
Nitrogen And Phosphorus ◽  
Leachate Treatment ◽  
Fenton's Reagent ◽  
Oxidation Processes

Abstract Treatment of leachate from an exploited since 2004 landfill by using two methods of advanced oxidation processes was performed. Fenton’s reagent with two different doses of hydrogen peroxide and iron and UV/H2O2 process was applied. The removal efficiency of biochemically oxidizable organic compounds (BOD5), chemically oxidizable compounds using potassium dichromate (CODCr) and nutrient (nitrogen and phosphorus) was examined. Studies have shown that the greatest degree of organic compounds removal expressed as a BOD5 index and CODCr index were obtained when Fenton’s reagent with greater dose of hydrogen peroxide was used - efficiency was respectively 72.0% and 69.8%. Moreover, in this case there was observed an increase in the value of ratio of BOD5/CODCr in treated leachate in comparison with raw leachate. Application of Fenton’s reagent for leachate treatment also allowed for more effective removal of nutrients in comparison with the UV/H2O2 process.

Kinetic Study of Advanced Oxidation of Eosin Dye by Fenton's Reagent

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Phalguni Banerjee ◽  
Sunando DasGupta ◽  
Sirshendu De
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Oxidation Study ◽  
Dye Decomposition ◽  
Detailed Kinetic Model

An advanced oxidation study using Fenton's reagent, i.e., ferrous sulfate and hydrogen peroxide was carried out for studying oxidation of eosin dye. Effects of concentration of various reagents on the degradation of dye were explored during an advanced oxidation process. It was found that ferrous concentration plays a major role in dye decomposition. Rate of dye decomposition is faster with an increase in ferrous sulfate concentration compared to the increase in hydrogen peroxide concentration. A detailed kinetic model was proposed. Profiles for eosin, hydrogen peroxide and various intermediates were also generated. The rate constant of the reaction of eosin with a hydroxyl radical was found to be of the order of 109 l/mol.s.

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