Electrochemical degradation of carbaryl on oxide electrodes

This paper presents the study of a prospective electrochemical treatment system for the pesticide carbaryl. Three different dimensionally stable anodes were employed (Ti/Ru 0.3Ti 0.7O 2, Ti/Ru 0.3Sn 0.7O 2 and Ti/Ir 0.3Ti 0.7O 2) and the effect of current density (10, 20, 40 and 60 mA cm −2) and sup...

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Bibliographic Details
Published in:Water research (Oxford) 2006-10, Vol.40 (17), p.3281-3289
Main Authors: Miwa, D.W., Malpass, G.R.P., Machado, S.A.S., Motheo, A.J.
Format: Article
Language:English
Subjects:
Applied sciences
Carbaryl
Carbaryl - chemistry
carbon
chemical degradation
chemical treatment
current density
Dimensionally stable anodes
electric current
electrical treatment
Electrochemical oxidation
Electrochemistry
Electrodes
Electrolytes
Exact sciences and technology
Other industrial wastes. Sewage sludge
oxidation
Oxidation-Reduction
oxides
Oxides - chemistry
pesticide residues
Pesticides
Pollution
pollution control
sodium chloride
sulfuric acid
total organic carbon
Wastes
water pollution
water treatment
Water treatment and pollution
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Summary:This paper presents the study of a prospective electrochemical treatment system for the pesticide carbaryl. Three different dimensionally stable anodes were employed (Ti/Ru 0.3Ti 0.7O 2, Ti/Ru 0.3Sn 0.7O 2 and Ti/Ir 0.3Ti 0.7O 2) and the effect of current density (10, 20, 40 and 60 mA cm −2) and supporting electrolyte (0.1 mol L −1 NaCl and 0.033 mol L −1 H 2SO 4) is discussed. All the electrodes present a low level of carbaryl and total organic carbon removal in H 2SO 4, even at highly positive potentials, indicating that the application of current is not, in itself, sufficient to promote effective oxidation of the pesticide and its products. However, in the presence of NaCl all the electrodes used present rapid diminishing of the carbaryl and total organic carbon content, thus suggesting enhanced activity. The results demonstrate the participation of partially oxidised Cl − species at the electrode surface, which act as an intermediate in the electron transfer between the pesticide molecule and the electrode. Thus, under such conditions, the feasibility of the electrochemical route for the treatment (total or partial) of waste that contains carbaryl is evident.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2006.06.033