Pt film electrodes prepared by the Pechini method for electrochemical decolourisation of Reactive Orange 16

Autor(es)

Gomes, L. ^[1] ; Freitas, R. G. ^[2] ; Malpass, G. R. P. ^[1] ; Pereira, E. C. ^[2] ; Motheo, A. J. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, DQ, LIEC, NANOFAEL, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Electrochemistry; v. 39, n. 1, p. 117-121, JAN 2009.
• Citações Web of Science: 8

Resumo

Electrochemical decolourisation of Reactive Orange 16 was carried out in an electrochemical flow-cell, using as working electrodes a Pt thin film deposited on a Ti substrate (Pt/Ti) prepared by the Pechini method and a pure platinum (Pt) foil. Using the Pt/Ti electrodes better results for dye decolourisation were obtained under milder conditions than those used for pure Pt. For the Pt electrode, colour removal of 93 % (lambda = 493 nm) was obtained after 60 min, at 2.2 V vs. RHE, using 0.017 mol L(-1) NaCl + 0.5 mol L(-1) H(2)SO(4) solution. For the Pt/Ti electrode there was better colour removal, 98%, than for the Pt electrode. Moreover, we used 0.017 mol L(-1) NaCl solution and the applied potential was 1.8 V. Under this condition after 15 min of electrolysis, more than 80% of colour was removed. The rate reaction constant, assuming a first order reaction, was 0.024 min(-1) and 0.069 min(-1), for Pt and Pt/Ti electrodes, respectively. (AU)

• Processo FAPESP: 05/04708-1 - Preparacao e caracterizacao de multicamadas metalicas para eletrocatalise.
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• Processo FAPESP: 04/09588-1 - Oxidacao eletroquimica de pesticidas.
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• Processo FAPESP: 03/09933-8 - Núcleo de Excelência em Materiais Nanoestruturados Fabricados Eletroquimicamente
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