scholarly journals Heterogeneous advanced photo- Fenton process using peroxymonosulfate and peroxydisulfate in presence of zero valent metallic iron: A comparative study with hydrogen peroxide photo-Fenton process

2016 ◽  
Vol 13 ◽  
pp. 117-126 ◽  
Author(s):  
L. Gomathi Devi ◽  
M. Srinivas ◽  
M.L. ArunaKumari
Keyword(s):  
Hydrogen Peroxide ◽  
Comparative Study ◽  
Metallic Iron ◽  
Fenton Process

CHEMICAL OXIDATION OF TREATED TEXTILE EFFLUENT BY HYDROGEN PEROXIDE AND FENTON PROCESS

2010 ◽  
Vol 9 (3) ◽  
pp. 351-360 ◽  
Author(s):  
Abdelnaser Omran ◽  
Hamidi Abdul Aziz ◽  
Marniyanti Mamat Noor
Keyword(s):  
Hydrogen Peroxide ◽  
Chemical Oxidation ◽  
Textile Effluent ◽  
Fenton Process

Degradation of Odontologic X-Ray Film Developing Wastewaters by Photo-Fenton Process

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Luciana Igarashi-Mafra ◽  
Edmilson César Bortoletto ◽  
Maria Angelica Simões Dornella Barros ◽  
Amanda Cristina Alfredo Contrucci Sorbo ◽  
Naiara Aguiar Galliani ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Total Phenol ◽  
Process Conditions ◽  
Phenol Removal ◽  
Total Phenols ◽  
Fenton Process ◽  
X Ray ◽  
Control Factors ◽  
Fenton Oxidation Process ◽  
Wastewater Samples

Effluents from radiographic X-ray film developing processes feature a high contaminant load (COD about 70000 mg/L and total phenols concentration about 16956 mg/L). Photo-Fenton's are potentially useful oxidation processes for destroying toxic organic compounds in water. In these reactions, hydrogen peroxide is combined with ferrous or ferric iron in the presence of light to generate hydroxyl radicals (·OH). The photo-Fenton process was explored as a photochemical treatment to degrade wastewater from radiographic X-ray film developing processes coming from odontologic clinics. A response surface methodology was applied to optimize the photo-Fenton oxidation process conditions using total phenol removal as the target parameter to be optimized, and the reagent concentrations, as related to the initial concentration of organic matter in the effluent, and time and pH as the control factors to be optimized. The best results in terms of maximal total phenol removal and economic process were achieved when wastewater samples were treated at pH 5 in the presence of hydrogen peroxide and iron in the ratios [total phenols]:[H2O2] 1:3 w/w and [Fe2+]:[H2O2] 1:18 w/w and time 1 h.

A comparative study of the electrogeneration of hydrogen peroxide using Vulcan and Printex carbon supports

Carbon ◽  
2011 ◽  
Vol 49 (8) ◽  
pp. 2842-2851 ◽  
Author(s):  
M.H.M.T. Assumpção ◽  
R.F.B. De Souza ◽  
D.C. Rascio ◽  
J.C.M. Silva ◽  
M.L. Calegaro ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Comparative Study ◽  
Carbon Supports

A comparative study between Keggin-type tungstophosphates and tungstosilicates in the oxidation of cyclooctane with hydrogen peroxide

2004 ◽  
Vol 222 (1-2) ◽  
pp. 159-165 ◽  
Author(s):  
M. Salete S. Balula ◽  
Isabel C.M.S. Santos ◽  
Mário M.Q. Simões ◽  
M. Graça P.M.S. Neves ◽  
José A.S. Cavaleiro ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Comparative Study ◽  
Keggin Type

scholarly journals Decomposition of Cyanide from Gold Leaching Tailingsby Using Sodium Metabisulphite and Hydrogen Peroxide

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Dongzhuang Hou ◽  
Lang Liu ◽  
Qixing Yang ◽  
Bo Zhang ◽  
Huafu Qiu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Comparative Study ◽  
Contact Time ◽  
Synergetic Effect ◽  
Economic Conditions ◽  
Gold Mine ◽  
Optimal Conditions ◽  
Gold Leaching ◽  
Sodium Metabisulphite ◽  
To Come

Cyanidation is widely used by most gold mine worldwide and will remain prevail in years (or decades) to come, while cyanide is hazardous, toxic pollutants whose presence in wastewater and tailings can seriously affect human and its environment; hence, it is necessary to control these contaminants. The purpose of this study was to examine the effects through the investigation of changes in pH, concentration, and contact time, and the optimal conditions were obtained. It has been proven that the decomposition of cyanide in solution and tailings increased as the alkalinity in the presence of 0.5 g/L Na2S2O5. An increase in H2O2 (30%) concentration (from 1 to 4 mL/L) increased the decomposition in solution, while the effect on removing cyanide was better when pH was 9 than 8 and 10 in tailings. The cyanide in tailings decreased in the first 4 h and increased after 4 h. The effective and economic conditions for maximum decomposition of cyanide from leach tailings are first treated in 0.5 g/L Na2S2O5 at pH 10 for 3 hours and then 2 mL/L H2O2 (30%) is added to the tailings at pH 9 for 4 hours through comparative study. The findings provide the basis to optimize the decomposition of cyanide from gold leaching tailings in mining or backfilling by using the synergetic effect of Na2S2O5 and H2O2.

scholarly journals Treatment of swine wastewater using the Fenton process with ultrasound and recycled iron

2020 ◽  
Vol 15 (3) ◽  
pp. 1
Author(s):  
Jair Juarez João ◽  
Cíntia Souza da Silva ◽  
José Luiz Vieira ◽  
Milena Felipe da Silveira
Keyword(s):  
Hydrogen Peroxide ◽  
Biological Systems ◽  
Oxygen Demand ◽  
Swine Wastewater ◽  
Organic Load ◽  
Fenton Process ◽  
Slaughterhouse Wastewater ◽  
Pork Production ◽  
Biological Sludge ◽  
Ultrasound Assisted

  Pork production involves the generation of wastewater containing a high pollutant load. Although the biological systems show satisfactory efficiency for the treatment of these effluents, they demand an elevated area for installation and high production of biological sludge. Alternatively, oxidative processes are an alternative for treating such effluents, requiring minor areas and increasing the efficiency of the treatment. We studied the Fenton process assisted with ultrasound for the treatment of swine slaughterhouse wastewater. Nails used in civil construction were used as the iron source. We evaluated the influence of pH, contact time, nail mass, and hydrogen peroxide concentration on color removal, turbidity, chemical oxygen demand (COD) and biochemical oxygen demand (BOD5). The removal of nutrients and oils and greases was also evaluated. The best results using the ultrasound-assisted Fenton process were obtained at pH 3, hydrogen peroxide concentration 90 mg L-1, and a nail unit (2.7g). In these conditions, color, turbidity, COD, and BOD5 removal of 98, 98.2, 84.6, and 98%, respectively, were achieved. The reduction in the other parameters evaluated was above 70%. Catalytic activity maintained above 90% until the sixth cycle of use. In general, the ultrasound-assisted Fenton process using the nail as a catalyst would be an alternative for the treatment of swine slaughterhouse wastewater. This alternative is responsible for the higher removal of organic load and nutrients in a shorter time when compared with biological systems.

Stable and selective electrosynthesis of hydrogen peroxide and the electro-Fenton process on CoSe2 polymorph catalysts

2020 ◽  
Vol 13 (11) ◽  
pp. 4189-4203 ◽  
Author(s):  
Hongyuan Sheng ◽  
Aurora N. Janes ◽  
R. Dominic Ross ◽  
Dave Kaiman ◽  
Jinzhen Huang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Noble Metal ◽  
Acidic Solution ◽  
Organic Pollutant ◽  
Metal Catalysts ◽  
Fenton Process ◽  
Noble Metal Catalysts ◽  
Electrosynthesis Of Hydrogen Peroxide ◽  
Earth Abundant

Earth-abundant CoSe2 outperforms noble metal catalysts for the selective 2e− ORR in acidic solution, enabling the stable bulk electrosynthesis of practically useful 547 ppm H2O2 and the effective electro-Fenton degradation of an organic pollutant.

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