Electrochemical degradation of C. I. Acid Orange 7

Fernandes, Annabel; Morão, A.; Magrinho, Manuel; Lopes, Ana; Gonçalves, I.C.

doi:10.1016/j.dyepig.2003.11.008

Cited by 249 publications

(186 citation statements)

References 16 publications

Supporting

Mentioning

166

Contrasting

Unclassified

Order By: Relevance

“…The potential hazards and damage caused by pesticides have been outlined by Walker et al [6]. In order to minimise the potential health risks, various treatment processes have been investigated to remove pesticides from water, including photo catalysis [7][8][9], electrochemical degradation [10,11], Fenton oxidation [10], hydrogen peroxide oxidation [12], and ultrasound [13]. Physico-chemical techniques which have demonstrated treatment efficacy include adsorption [14], membrane technology [15], ozone, UV photolysis, ozone/ultraviolet (UV) photolysis [16,17], and ultrasonication [18].…”

Section: Introductionmentioning

confidence: 99%

Pesticide degradation in water using atmospheric air cold plasma

Sarangapani¹,

Misra²,

Milosavljević³

et al. 2016

Journal of Water Process Engineering

180

View full text Add to dashboard Cite

a b s t r a c tA high voltage dielectric barrier discharge plasma reactor using atmospheric air as the inducer gas was studied for the degradation of pesticides (dichlorvos, malathion, endosulfan) in water. The degradation kinetics of the pesticides were studied using GC-MS as a function of plasma control parameters. Electrical characterisation of the plasma revealed that the plasma discharge consisted of filamentary streamers. Excited nitrogen, reactive oxygen species and OH radicals generated in the dielectric barrier discharge (DBD) plasma reactor were identified using optical emission spectroscopy. Ozone, used as an indicator for metastable oxygen species, was quantified within the reactor at concentrations of 1600, 2200, 2800 ppm after 8 min of plasma treatment for applied voltages of 60, 70, and 80 kV respectively. The degradation efficacy of pesticides after 80 kV and 8 min of plasma treatment were found to be 78.98 ± 0.81% for dichlorvos, 69.62 ± 0.14% for malathion and 57.71 ± 0.58% for endosulfan. Degradation was found to follow first order kinetics. GC-MS analyses showed that the degraded compounds and intermediates formed were less toxic than the parent pesticide. A proposed mechanism of degradation of these pesticides is suggested.

show abstract

Section: Introductionmentioning

confidence: 99%

Pesticide degradation in water using atmospheric air cold plasma

Sarangapani¹,

Misra²,

Milosavljević³

et al. 2016

Journal of Water Process Engineering

180

View full text Add to dashboard Cite

show abstract

“…A major difference can be seen by comparing the percentage of AOII removal with that of TOC removal by the EPC process. The degree of mineralization was lower than that of the decomposition of AOII, which is not uncommon in heterogeneous catalysis (Fernandes et al, 2004;Li et al, 2006;Murugananthan et al, 2007). The cleavage of the AOII molecular structure first occurs at positions that are susceptible to free radical attack with the production of various intermediates.…”

Section: Epc Degradation Of Aoiimentioning

confidence: 92%

Electro-photocatalytic degradation of acid orange II using a novel TiO2/ACF photoanode

Hou

Zhao

et al. 2009

Science of The Total Environment

View full text Add to dashboard Cite

A novel photoanode was prepared by immobilizing TiO 2 film onto activated carbon fibers (TiO 2 /ACF) using liquid phase deposition (LPD) to study the electro-photocatalytic (EPC) degradation of organic compounds exemplified by an azo-dye, namely, Acid Orange II (AOII).Results demonstrated that by applying a 0.5 V bias (vs. SCE) across the TiO 2 /ACF electrode, the AOII degradation rate was increased significantly compared to that of photocatalytic (PC) oxidation. The application of an electric field promotes the separation of photogenerated electrons and holes as confirmed by electrochemical impedance spectroscopy (EIS) measurements. The structural and surface morphology of the TiO 2 /ACF electrode was characterized by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). SEM images showed that TiO 2 was deposited on almost every carbon fiber with an average thickness of about 200 nm with the inner space between neighboring fibers being maintained unfilled. The morphological features of the photo-anode facilitated the passage of solution as well as UV light through the felt-form electrode and created a threedimensional environment favorable to EPC oxidation. Both the large outer surface area of the 3D electrode and the good organic adsorption capacity of the ACF support promoted high contact efficiency between AOII and TiO 2 surface. Anatase was the major crystalline TiO 2 deposited. UV-vis spectrophotometry, TOC (total organic carbon) analysis, and HPLC technique were used to monitor the concentration change of AOII and intermediates as to gain insight into the EPC degradation of AOII using the TiO 2 /ACF electrode. IntroductionThe degradation of organic pollutants in water by the photocatalytic semiconductor TiO 2 has attracted extensive attention in recent decades. Many researchers have reported that most refractory organic contaminants such as detergents, dyes, pesticides, and herbicides, can be decomposed by TiO 2 under UV-light irradiation. It has been known also that conventional photooxidation has two major disadvantages: difficulty in solid-liquid separation and low photo-efficiency. For use in TiO 2 suspension, extra effort is needed to separate the photocatalytic TiO 2 particles from water. To deal with the 0 7 ( 2 0 0 9 ) 2 4 3 1 -2 4 3

show abstract

“…These results are different from the previously reported results obtained with aromatic compounds' (phenols, dyes and surfactants) degradation, leading to the conclusion that electrogenerated oxidants from the anodic oxidation of the electrolyte play a very important role in the oxidation process. In this context, it was previously reported (Martinez-Huitle and Brillas 2009;Martinez-Huitle and Ferro 2006;Rodrigo et al 2010) that the electrochemical oxidation of wastewaters on conductive-diamond anodes can lead to the electrosynthesis of different oxidants such as peroxosulphates , peroxophosphates (Canizares et al 2005b), hypochlorite (Fernandes et al 2004), etc. The type of these oxidants depends on the waste composition (e.g., pH and electrolytes) and on the operating conditions.…”

Section: Galvanostatic Electrolysesmentioning

confidence: 98%

Electrochemical oxidation of succinic acid in aqueous solutions using boron doped diamond anodes

Bensalah

Louhichi

Abdel‐Wahab

2011

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

In this work, the electrochemical oxidation of succinic acid on boron-doped diamond (BDD) anodes was investigated. Voltammetric study had shown that no peaks appeared in the region of electrolyte stability which indicates that succinic acid oxidation can take place at a potential close to the potential region of electrolyte oxidation. Galvanostatic electrolyses achieved total chemical oxygen demand (COD) removals and high mineralization yields under different operating conditions (initial COD, current density and nature of supporting electrolyte). Oxalic, glycolic and formic acids were the main intermediates detected during anodic oxidation of succinic acid on BDD electrode and carbon dioxide as the final product. The mean oxidation state of carbon reached the value of 4 at the end of electrolysis which is indicative of mineralization of almost all organics present in aqueous solution. The exponential profile of COD versus specific electrical charge has shown that mass transfer is the limiting factor for the kinetics of electrochemical process. A simple mechanism was proposed for the mineralization of succinic acid. First, hydroxyl radicals attack of succinic acid leading to formation of glycolic, glyoxylic, fumaric and maleic acids. Then, theses acids undergo rapid and non-selective oxidation by hydroxyl radicals to be transformed into oxalic and formic acids which leads to further oxidation steps to mineralize these acids into carbon dioxide and water.

show abstract

Electrochemical degradation of C. I. Acid Orange 7

Cited by 249 publications

References 16 publications

Pesticide degradation in water using atmospheric air cold plasma

Pesticide degradation in water using atmospheric air cold plasma

Electro-photocatalytic degradation of acid orange II using a novel TiO2/ACF photoanode

Electrochemical oxidation of succinic acid in aqueous solutions using boron doped diamond anodes

Contact Info

Product

Resources

About