(9) the oxidation rate of organic compounds is fast when large amount of ferrous ions are present because large amount of hydroxyl radicals are produced. However, the Fenton reaction may slow down due to the slow ferrous ion production. In previous studies, the photocatalytic degradation of dichlorvos (DDVP. an insecticide) on glass supported titanium dioxide was investigated. Results indicate that photocatalysis can be an effective process for the degradation of dichlorvos [3]. The mineralization of dichlorvos and the reduction of toxicity were investigated via the photocatalytic reaction [4]. This study uses Fenton’s reagent, ferrous ions/hydrogen peroxide, to oxidize dichlorvos with an attempt to explore the behavior of dichlorvos oxidation and how factors such as pH, [H O ],

2014 ◽  
pp. 920-921
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Organic Compounds ◽  
Hydroxyl Radicals ◽  
Oxidation Rate ◽  
Ferrous Ion ◽  
Photocatalytic Reaction ◽  
Ferrous Ions ◽  
Ion Production

Catalytic action of goethite in the oxidation of 2-chlorophenols with hydrogen peroxide

2007 ◽  
Vol 55 (12) ◽  
pp. 101-106 ◽  
Author(s):  
Y.-T. Lin ◽  
M.-C. Lu
Keyword(s):  
Hydrogen Peroxide ◽  
Particle Size ◽  
Catalytic Oxidation ◽  
Organic Compounds ◽  
Oxidation Rate ◽  
Catalytic Action ◽  
Main Mechanism ◽  
Ferrous Ions

The use of goethite and hydrogen peroxide was recently found to effectively oxidise organic compounds. This research was to investigate the effect of adsorption, pH, Fe2 +  and Fe3 +  on 2-CP oxidation. Results indicated that 2-CP can be decomposed with hydrogen peroxide catalysed by goethite and the oxidation rate increased with decreasing goethite particle size. The optimum oxidation rate was observed at the pH below 3.0.Addition of Fe2 +  and Fe3 +  can enhance the catalytic oxidation rate of 2-CP very efficiently. The main mechanism of goethite catalysing hydrogen peroxide to oxidise 2-CP may be due to the catalysis of ferrous ions and goethite surface.

An Introduction to Advanced Oxidation Processes (AOP) for Destruction of Organics in Wastewater

1992 ◽  
Vol 27 (1) ◽  
pp. 1-22 ◽  
Author(s):  
J. H. Carey
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Wastewater Treatment ◽  
Organic Compounds ◽  
Hydroxyl Radicals ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Oxidation Processes ◽  
Oxidation Of Organic Compounds ◽  
Organic Wastewater

Abstract Various processes that have been suggested for the oxidation of organic compounds in wastewater are summarized. The most widely applicable are based on generation of hydroxyl radicals via the photolysis of hydrogen peroxide, ozone and titanium dioxide. Other methods of generating hydroxyl radicals and other oxidants, as well as other methods of oxidation that have been suggested for organic wastewater treatment are also discussed.

Semiconductor Mediated Photocatalysed Reaction of Two Selected Organic Compounds in Aqueous Suspensions of Titanium Dioxide

2012 ◽  
Vol 15 (2) ◽  
Author(s):  
Niyaz A. Mir ◽  
M.M. Haque ◽  
A. Khan ◽  
K. Umar ◽  
M. Muneer ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Titanium Dioxide ◽  
Organic Carbon ◽  
Photocatalytic Degradation ◽  
Organic Compounds ◽  
Substrate Concentration ◽  
Degradation Kinetics ◽  
Irradiation Time ◽  
Aqueous Suspensions ◽  
Kinetics Of

AbstractSemiconductor mediated hydrogen peroxide-assisted photocatalytic degradation of two selected pesticide compounds, chloramben (1) and cyanazine (2) has been investigated in aqueous suspensions under a variety of conditions. The degradation was studied by monitoring the depletion in total organic carbon (TOC) content and decrease in substrate concentration as a function of irradiation time. The degradation kinetics of pesticide compounds 1 and 2 were investigated under different conditions such as type of TiO

scholarly journals THE RATE CONSTANT OF THE REACTION BETWEEN FERROUS IONS AND HYDROGEN PEROXIDE IN ACID SOLUTION

1957 ◽  
Vol 35 (5) ◽  
pp. 428-436 ◽  
Author(s):  
T. J. Hardwick
Keyword(s):  
Hydrogen Peroxide ◽  
Acid Solution ◽  
Sulphuric Acid ◽  
Acid Concentration ◽  
Rate Constant ◽  
Perchloric Acid ◽  
Ferrous Ion ◽  
Ferrous Ions ◽  
Bimolecular Rate Constant

Identical values of the bimolecular rate constant of the ferrous ion – hydrogen peroxide reaction were obtained from intercomparisons of the methods previously used in following this reaction. In perchloric acid the bimolecular rate constant is unaffected by acid concentration; in sulphuric acid it increases slightly in acid concentrations above 10−2N. The results agree with and explain the differences between those obtained by Baxendale and by Dainton, but are only in marginal agreement with those recently reported by Weiss.

Photocatalysed Oxidation of Toxic Organics

1987 ◽  
Vol 19 (3-4) ◽  
pp. 381-390 ◽  
Author(s):  
M. Brett Borup ◽  
E. Joe Middlebrooks
Keyword(s):  
Hydrogen Peroxide ◽  
Ultraviolet Radiation ◽  
Organic Compounds ◽  
Hydroxyl Radicals ◽  
Reaction Rate ◽  
Oxidation Process ◽  
Dimethyl Phthalate ◽  
First Order ◽  
Toxic Organics ◽  
Catalyzed Oxidation

The feasibility of treating water contaminated by two toxic organic compounds with an ultraviolet light catalyzed oxidation process using hydrogen peroxide as an oxidant is investigated. In this process hydrogen peroxide is decomposed by ultraviolet radiation producing hydroxyl radicals. The hydroxyl radicals will then oxidize organic compounds via a complex chain of radical reactions. Tests showed that this photooxidation process could successfully remove isophorone and dimethyl phthalate from contaminated waters. A reaction rate expression which adequately describes the process was developed. The reaction rate was found to be first order with respect to hydrogen peroxide concentration, zero order with respect to organic concentration and a function of ultraviolet radiation intensity. The reaction did not exhibit autocatalytic characteristics.

Photocatalytic Degradation of Organics Diluted in Water Using TiO2 Loaded on Fluoride-Modified Mesoporous Silica

2007 ◽  
Vol 544-545 ◽  
pp. 115-118
Author(s):  
Shinichi Kawasaki ◽  
Yusuke Okada ◽  
Shuai Yuan ◽  
Kohsuke Mori ◽  
Hiromi Yamashita
Keyword(s):  
Mesoporous Silica ◽  
Photocatalytic Degradation ◽  
Organic Compounds ◽  
Photocatalytic Performance ◽  
Tetraethyl Orthosilicate ◽  
Photocatalytic Reaction ◽  
Fluoride Ions ◽  
Reaction Field

The synthesis of the hydrophobic mesoporous silica MS(F) was performed using tetraethyl orthosilicate, triethoxyfluorosilane as the source of the fluoride and dodecylamine as templates. The TiO2 loaded on the hydrophobic MS(F) (TiO2/MS(F)) exhibited the efficient photocatalytic performance for the degradation of alcohols (iso-butanol) diluted in water. The photocatalytic reactivity for the degradation increased with increasing the content of fluoride ions on these photocatalysts. The hydrophobic mesoporous surface is suitable as the photocatalytic reaction field for the degradation of organic compounds diluted water.

Hydrogen peroxide-assisted photocatalytic degradation of textile wastewater using titanium dioxide and zinc oxide

2017 ◽  
Vol 40 (10) ◽  
pp. 1223-1232 ◽  
Author(s):  
Fernando Santos Domingues ◽  
Thábata Karoliny Formicoli de Souza Freitas ◽  
Cibele Andrade de Almeida ◽  
Renata Padilha de Souza ◽  
Elizângela Ambrosio ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Textile Wastewater

scholarly journals Cobalt Oxide-Modified Titanium Dioxide Nanoparticle Photocatalyst for Degradation of 2,4-Dichlorophenoxyacetic Acid

2017 ◽  
Vol 17 (2) ◽  
pp. 284 ◽  
Author(s):  
Leny Yuliati ◽  
Nur Azmina Roslan ◽  
Wai Ruu Siah ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Cobalt Oxide ◽  
Uv Light ◽  
Dichlorophenoxyacetic Acid ◽  
Photocatalytic Reaction ◽  
Impregnation Method ◽  
Titanium Dioxide Nanoparticle ◽  
2,4 Dichlorophenoxyacetic Acid

2,4-dichlorophenoxyacetic acid (2,4-D) has been recognized as a possibly carcinogenic compound to human, therefore, 2,4-D should be treated before it is discharged to the environment. Photocatalytic degradation of 2,4-D has been proposed as one of the best methods that offer environmentally safe process. In the present research, titanium dioxide (TiO2) was modified with cobalt oxide (CoO) and tested for photocatalytic degradation of 2,4-D under UV light irradiation. Different amounts of CoO (0.1, 0.5, 1 and 5 mol%) were added onto TiO2 by an impregnation method. The photocatalytic reaction was monitored and analyzed by measurement of 2,4-D absorbance using UV spectrophotometer. After 1 h photocatalytic reaction, it was confirmed that the sample with low loading of 0.1 mol% gave the highest photocatalytic activity among the bare and modified TiO2 photocatalysts. The photocatalytic activity was decreased with the increase of CoO loading, suggesting that the optimum amount of CoO was an important factor to improve the performance of TiO2. Based on fluorescence spectroscopy, such addition of CoO resulted in the reduced emission intensity, which showed the successful decrease in the electron-hole recombination.

scholarly journals Ferrous ion-EDTA-stimulated phospholipid peroxidation. A reaction changing from alkoxyl-radical- to hydroxyl-radical-dependent initiation

1984 ◽  
Vol 224 (3) ◽  
pp. 697-701 ◽  
Author(s):  
J M C Gutteridge
Keyword(s):  
Hydrogen Peroxide ◽  
Lipid Peroxidation ◽  
Hydroxyl Radical ◽  
Hydroxyl Radicals ◽  
Superoxide Radicals ◽  
Ferrous Ion ◽  
Radical Scavengers ◽  
Alkoxyl Radical ◽  
Phospholipid Peroxidation ◽  
Hydroxyl Radical Scavengers

The stimulatory effect of ferrous salts on the peroxidation of phospholipids can be enhanced by EDTA when the concentration of Fe2+ in the reaction is greater than that of EDTA. Hydroxyl-radical scavengers do not inhibit peroxidation until the concentrations of Fe2+ and EDTA in the reaction are equal. Lipid peroxidation is then substantially initiated by hydroxyl radicals derived from a Fenton-type reaction requiring hydrogen peroxide. Superoxide radicals appear to play some role in the formation of initiating species.

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