Degradation of Auramine-O in Aqueous Solution by Ti/PbO2-Electro-Fenton Process by Hydrogen Peroxide Produced In Situ

2020 ◽  
Author(s):  
Wenhui Sun ◽  
Yingwu Yao
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Fenton Process ◽  
Auramine O

Experimental and Modelling Approach for the Comparison of Fenton and Electro-Fenton Processes. Preliminary Results

2006 ◽  
Vol 9 (1) ◽  
Author(s):  
Truong Giang Le ◽  
Alain Bermond
Keyword(s):  
Hydrogen Peroxide ◽  
Oxygen Reduction ◽  
Organic Compounds ◽  
Fenton Reaction ◽  
Experimental Approach ◽  
Fenton Process ◽  
Iron Salt ◽  
Preliminary Results ◽  
Modelling Approach

AbstractThe Electro-Fenton is one of the processes based on the Fenton reaction, which have been investigated to improve the efficiency of classical Fenton treatment. The Electro-Fenton has been shown to be efficient in the degradation of many organic compounds. However, generally there is no true estimation of its efficiency compared to that of the classical Fenton process. This study aimed to compare the two processes using an experimental approach and modelling. First of all, degradation of hydrogen peroxide (externally applied) was studied. It was shown that the Electro-Fenton process needs smaller quantities of iron (5 times less) than the Fenton to decompose the same quantity of hydrogen peroxide. The Electro-Fenton process may also produce hydrogen peroxide in situ (oxygen reduction). This leads to an important reduction in the consumption of chemicals (hydrogen peroxide, small quantities of iron salt). Finally, a study of the degradation of phenol, when hydrogen peroxide was electrogenerated has shown the greater efficiency of Electro-Fenton compared to the Fenton process.

Electrocatalytic Activity of Three Carbon Materials for the In-situ Production of Hydrogen Peroxide and Its Application to the Electro-Fenton Heterogeneous Process

2016 ◽  
Vol 14 (4) ◽  
pp. 843-850 ◽  
Author(s):  
Orlando García-Rodríguez ◽  
Jennifer A. Bañuelos ◽  
Arturo Rico-Zavala ◽  
Luis A. Godínez ◽  
Francisco J. Rodríguez-Valadez
Keyword(s):  
Hydrogen Peroxide ◽  
Electrocatalytic Activity ◽  
Lower Cost ◽  
Carbon Materials ◽  
Carbon Cloth ◽  
Fenton Process ◽  
Toc Removal ◽  
Iron Salts ◽  
Production Of Hydrogen

Abstract The in-situ generation of hydrogen peroxide in the electro-Fenton process is paramount. For this reason, in this research the electrocatalytic activity of three carbon materials was evaluated in the reaction of oxygen reduction via two electrons. Furthermore, in order to eliminate the use of iron salts in solution (homogeneous process), the iron was electrodeposited on the surface of the carbon material and was applied in a heterogeneous electro-Fenton process for the degradation of methyl orange dye. The largest amount of generated H2O2 was achieved with the Carbon Felt (CF) electrode (460 mg L−1) without iron after 60 minutes. The electrodes with electrodeposited iron were characterized by SEM and EDS, which showed that the surface of the Carbon Sponge (CS) electrode had the largest amount of iron (23.84 %). However, the CF electrode showed a greater and faster degradation of the dye (98 %) after 30 minutes of treatment. The CF material was the best and most-viable choice of material compared to the CS and Carbon Cloth (CC) for industrial application in electro-Fenton processes, due to its greater catalytic activity in the production of H2O2, uniform distribution of iron, more efficient TOC removal and lower cost per cm2 of material.

Epoxidation of Olefins Catalyzed by Polyoxomolybdates Formed in-situ in Ionic Liquids

2013 ◽  
Vol 68 (10) ◽  
pp. 1138-1142 ◽  
Author(s):  
Lilian R. Graser ◽  
Sophie Jürgens ◽  
Michael E. Wilhelm ◽  
Mirza Cokoja ◽  
Wolfgang A. Herrmann ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Ionic Liquid ◽  
Catalyst Concentration ◽  
Sodium Molybdate ◽  
Significant Loss ◽  
Catalytic Epoxidation ◽  
Epoxidation Reaction ◽  
Epoxidation Of Olefins

Polyoxomolybdates were generated in situ by treating a carboxylic acid-functionalized ionic liquid with an aqueous solution of sodium molybdate. This reaction mixture was applied in the catalytic epoxidation of olefins using hydrogen peroxide as oxidant. The influence of acid and catalyst concentration as well as of the reaction temperature was investigated. The system showed a good performance for the epoxidation reaction and can be reused several times without a significant loss of activity. We present an easy, cheap and environmentally friendly catalytic system for the epoxidation of cis-cyclooctene.

Degradation of Ciprofloxacin in Aqueous Solution by the Fenton Process

2012 ◽  
Vol 610-613 ◽  
pp. 352-355 ◽  
Author(s):  
Ji Feng Yang ◽  
Hong Hui Chen
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Oxidation Process ◽  
Ph Value ◽  
Fenton Process ◽  
Ferrous Ions ◽  
Reaction Conditions ◽  
Initial Ph ◽  
Optimum Reaction ◽  
Ciprofloxacin Removal

The present study provides results describing the degradation performance of ciprofloxacin antibiotic via Fenton treatment. The effect of reaction conditions including the initial pH value, and dosages of ferrous ions and hydrogen peroxide on ciprofloxacin and COD removal was investigated. Ciprofloxacin removal efficiency of more than 90% was achieved under optimum reaction conditions of pH value of 2, dosages of 0.75 mmol/L of ferrous ion, and 2.0 mmol/L of hydrogen peroxide after 10min. However, the change of COD in aqueous solution was not obvious and further study about intermediate products during oxidation process should be carried out in the future.

scholarly journals Continuous Bioinspired Oxidation of Sulfides

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2711
Author(s):  
Francesca Mangiavacchi ◽  
Letizia Crociani ◽  
Luca Sancineto ◽  
Francesca Marini ◽  
Claudio Santi
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Selective Oxidation ◽  
Flow Conditions ◽  
Oxidation Of Sulfides ◽  
Vinyl Sulfides ◽  
Scale Preparation ◽  
Dialkyl Sulfides

A simple, efficient, and selective oxidation under flow conditions of sulfides into their corresponding sulfoxides and sulfones is reported herein, using as a catalyst perselenic acid generated in situ by the oxidation of selenium (IV) oxide in a diluted aqueous solution of hydrogen peroxide as the final oxidant. The scope of the proposed methodology was investigated using aryl alkyl sulfides, aryl vinyl sulfides, and dialkyl sulfides as substrates, evidencing, in general, a good applicability. The scaled-up synthesis of (methylsulfonyl)benzene was also demonstrated, leading to its gram-scale preparation.

scholarly journals Ultra-Fast Degradation of p-Aminophenol by a Nanostructured Iron Catalyst

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2166 ◽  
Author(s):  
Rocio Benavente ◽  
David Lopez-Tejedor ◽  
Carlos Perez-Rizquez ◽  
Jose Palomo
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Room Temperature ◽  
Iron Catalyst ◽  
Catalytic Performance ◽  
Environmental Pollutant ◽  
Optimal Conditions ◽  
Mentha X Piperita ◽  
Liquid Extract

Full degradation of p-aminophenol in aqueous solution at room temperature by using a heterogeneous nanostructured iron hybrid catalyst in the presence of hydrogen peroxide is described. A nanostructured iron catalyst was prepared by in situ formation of iron carbonate nanorods on the protein network using an aqueous solution of an enzyme, lipase B from Candida antarctica (CAL-B). A second kind of iron nanostructured catalyst was obtained by the sunsequent treatment of the hybrid with an aqueous liquid extract of Mentha x piperita. Remarkable differences were observed using TEM imaging. When M. piperita extract was used, nanoparticles appeared instead of nanorods. Catalytic activity of these iron nanocatalysts was studied in the degradation of the environmental pollutant p-aminophenol (pAP) under different operating parameters, such as pH, presence of buffer or hydrogen peroxide concentration. Optimal conditions were pH 4 in acetate buffer 10 mM containing 1% (v/v) H2O2 for FeCO3NRs@CALB, while for FeCO3NRs@CALB-Mentha, water containing 1% (v/v) H2O2, resulted the best. A complete degradation of 100 ppm of pAP was achieved in 2 and 3 min respectively using 1 g Fe/L. This novel nanocatalyst was recycled five times maintaining full catalytic performance.

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