Electrochemical treatment of tannery wastewater using DSA® electrodes

Costa, Carla Regina; Botta, Clarice Maria Rispoli; Espíndola, Evaldo Luiz Gaeta; Olivi, Paulo

doi:10.1016/j.jhazmat.2007.09.005

Cited by 208 publications

(85 citation statements)

References 39 publications

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“…For example, they are efficient electrodes for sustaining the oxygen evolution reaction (OER), which is of great importance in water electrolyzers, rechargeable batteries, and zinc, copper, cobalt and nickel electrowinning processes. MMO electrodes have also been applied for electrochemical and, in particular, electrocatalytic oxidation of refractory organic compounds in wastewaters [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

Shestakova

Bonete

Gómez

et al. 2014

Electrochimica Acta

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Please cite this article as: M. Shestakova, P. Bonete, R. Gómez, M.S. , Walter Z. Tang, Novel Ti/Ta 2 O 5 -SnO 2 electrodes for water electrolysis and electrocatalytic oxidation of organics, Electrochimica Acta (2014), http://dx.doi. org/10.1016/j.electacta.2013.12.113 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Introductionmentioning

confidence: 99%

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

Shestakova

Bonete

Gómez

et al. 2014

Electrochimica Acta

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“…Electrochemical, ozonation, electro and photo-Fenton, photocatalysis, and heterogeneous photocatalysis are some of the processes that have been frequently proposed for the treatment of organic pollutants by many researchers in the recent literature. [7][8][9][10][11][12] In this context, the electrochemical processes are always claimed to be an attractive alternative to the degradation of organic pollutants. Versatility, easy operation, relatively lower cost, and no production of sludge during the treatment are some of the major advantages of the electrochemical approach.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical degradation of reactive dyes at different DSA® compositions

Silva¹,

Neto²,

Andrade³

2011

J. Braz. Chem. Soc.

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Este trabalho investiga a oxidação eletroquímica dos corantes azul reativo 4 (RB-4) e laranja reativo 16 (RO-16) utilizando ânodos dimensionalmente estáveis de RuO 2 . As eletrólises foram realizadas sob controle galvanostático em função do eletrólito de suporte e composição do material eletródico. As eletrólises feitas na presença ou ausência de NaCl foram capazes de remover totalmente a coloração da solução; no entanto, um aumento significativo da combustão do corante somente foi obtido para na presença de cloreto (valores de 80% de remoção de carbono foram atingido). Concentrações elevadas de cloreto não implicaram em aumento significativo de remoção da cor ou mineralização. A composição do óxido influência na destruição do corante (com ou sem cloreto), observa-se que Ti/Ru 0.30 Ti 0.70 O 2 é o material mais ativo para oxidação dos compostos investigados. A reação de desprendimento de oxigênio é uma reação paralela limitante em ambos os eletrólitos de suporte investigados, NaCl e Na 2 SO 4 , e a competição com a oxidação do composto orgânico ainda é um obstáculo. A análise da formação de compostos organoclorados (AOX) revela que existe um pequeno consumo das espécies formadas nos primeiros minutos de eletrólise, a composição Ti/(RuO 2 ) 0.70 (Ta 2 O 5 ) 0.30 é a composição com melhores características para emprego no tratamento ambientais. Tanto a composição como o eletrólito afetam a formação de compostos indesejáveis. This paper investigates the electrochemical oxidation of the reactive dyes reactive blue 4 (RB-4) and reactive orange 16 (RO-16) on RuO 2 dimensionally stable anode (DSA ® ) electrodes. Electrolysis was achieved under galvanostatic control as a function of supporting electrolyte and electrode composition. The electrolyses, performed in either the presence or absence of NaCl, were able to promote efficient color removal; moreover, at low chloride concentration (0.01 mol L -1 ), total color removal was obtained after just 10 min of electrolysis, and a significant increase in total dye combustion was achieved for all the studied anodes in chloride medium (reaching ca. . No significant enhancement in dye color removal or mineralization was observed upon increasing chloride concentration. The influence of oxide composition on dye elimination seems to be significant in both media (with or without chloride), being Ti/Ru 0.30 Ti 0.70 O 2 , the most active material for organic compound oxidation. The oxygen evolution reaction (OER) was shown to be a limiting reaction in both supporting electrolytes; i.e., NaCl and Na 2 SO 4 , and its competition with organic compound oxidation remained an obstacle. The adsorbable organo halogens (AOX) formation study revealed that there is slight consumption of the undesirable species formed within the first minutes of the electrolysis, being Ti/(RuO 2 ) 0.70 (Ta 2 O 5 ) 0.30 the most environmentally friendly composition. Both anode composition and chloride concentration affect the formation of these undesirable compounds.Keywords: reactive dyes, electrochemical oxidat...

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“…A transformação da pele animal em couro exige uma série de tratamentos e uso de grandes quantidades de produtos químicos. É constituída basicamente por três etapas: ribeira, curtimento e acabamento (NAZER; AL-SA'ED; SIEBEL, 2006;COSTA et al, 2008). A ribeira tem por finalidade a limpeza e eliminação de substâncias como pêlos, gordura e sangue que não farão parte do produto manufaturado, bem como preparar a matriz de fibras colagênicas para posterior adição de produtos químicos nas etapas seguintes.…”

Section: Introductionunclassified

Comparação entre alguns processos de oxidação avançados na cinética de degradação do efluente bruto de curtume

Maler

Takashima

2011

Semina: Tech. Ex.

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ResumoNeste trabalho foi investigada a cinética de degradação do efluente bruto de curtume, coletado no tanque de homogeneização com demanda química de oxigênio equivalente a 3340 mg L -1 e pH de 8,1, por processos de oxidação avançados como fotocatálise mediada por semicondutor, fotólise em presença de peróxido de hidrogênio e processo foto-Fenton a 30 o C. Os experimentos foram realizados usando-se o efluente diluído na proporção de 1:50 em água destilada no interior de um reator cilíndrico de parede dupla aberto à atmosfera, variando-se a concentração dos oxidantes. As constantes de velocidade de degradação, k obs , do efluente, calculadas sob condições de pseudo-primeira ordem, foram maiores para o processo fotocatalítico em meio de ZnO (k obs = 1,23x10-1 a 2,74x10 In this work it was investigated the degradation kinetics of the crude tannery wastewater, collected in the homogenized reservoir with a chemical oxygen demand of 3340 mg L -1 at pH 8.1, through the advanced oxidation processes as photocatalysis mediated by semiconductor, photolysis in presence of hydrogen peroxide and photo-Fenton process at 30 o C. The experiments were performed using a 1:50 proportion in distilled water inside the double wall cylindrical reactor opened to the atmospheric air by varying the oxidant concentration. The degradation rate constants, k obs , determined under pseudofirst order conditions in pH ca. 7.3 and 30 ºC, were higher for the photocatalytic process mediated by ZnO (k obs = 1.23x10 -1 to 2.74x10 -1 min -1 ) followed by TiO 2 (0.90x10 -2 min -1 to 3.35x10 -2 min -1 ). As to for the rate constants under photolysis in presence of H 2 O 2 (9.36x10 -3 to 7.44x10 -3 min -1 ) at pH ca. 6.8 as well as in photo-Fenton (7.30x10 -3 to 12.0x10 -3 min -1 ) at pH 5.8 was significantly lower than photocatalysis at 30°C. The chemical oxygen demand of the wastewater was completely removed after 2 h on photocatalytic process at 30 °C.

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Electrochemical treatment of tannery wastewater using DSA® electrodes

Cited by 208 publications

References 39 publications

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

Novel Ti/Ta2O5-SnO2 electrodes for water electrolysis and electrocatalytic oxidation of organics

Electrochemical degradation of reactive dyes at different DSA® compositions

Comparação entre alguns processos de oxidação avançados na cinética de degradação do efluente bruto de curtume

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