Anodic oxidation of a simulated effluent containing Reactive Blue 19 on a boron-doped diamond electrode

Petrucci, Elisabetta; Montanaro, Daniele

doi:10.1016/j.cej.2011.09.074

Cited by 46 publications

(16 citation statements)

References 30 publications

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“…For this reason, oxidation methods have been investigated for the efficient decolorization and degradation of these refractory organic dyes [4]. Electrochemical oxidation (EO) is one of the most attractive methods featuring easy implementation, high efficiency and environmental compatibility [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of cerium-doped lead dioxide anode with improved electrocatalytic activity and its application for removal of Rhodamine B

Zhang

Cui

et al. 2013

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Fabrication of cerium-doped lead dioxide anode with improved electrocatalytic activity and its application for removal of Rhodamine B

Zhang

Cui

et al. 2013

Chemical Engineering Journal

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“…Esse comportamento foi justificado devido à influência positiva que o aumento da temperatura causa no transporte de massa. Todavia, Degaki et al 51 e Petrucci e Montanaro 52 concluíram que o aumento da temperatura influenciou positivamente a remoção do corante via oxidação também utilizando filmes de DDB. Vale destacar que foram utilizados eletrodos de DDB comerciais, sendo que a dopagem foi mencionada apenas no trabalho de Degaki et al, 51 entre 2.000 e 4.500 ppm relação B/C.…”

Section: Influência Da Temperaturaunclassified

Electrochemical Oxidation of Reactive Black 5 and Blue 19 Dyes Using a Non Commercial Boron-Doped Diamond Electrode

Vasconcelos¹,

Souza²,

Guaraldo³

et al. 2016

Química Nova

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respectively azo and anthraquinone textile dyes, by electrochemical oxidation using a non commercial boron doped diamond electrode supported on titanium metallic with a relation between B and C equal to 15,000 ppm. Pt was used as counter electrode and Ag/AgCl (sat) was the reference electrode. The variables investigated to optimize the degradation were support electrolyte concentration (0.05, 0.1 and 0.2 mol L -1 of K 2 SO 4 ), temperature (25, 35 and 45 ºC) and pH (2.5 and 10) by applying a current density of 75 mA cm -2. Total decolorization was observed in all electrochemical conditions studied. The highest rates of mineralization and chromatographic area removal were attained at high support electrolyte concentration due to the increase of conductivity, which caused more generation of hydroxyl radicals. RP5 was degraded at lower electrolysis time than RA19 with smaller requirement of electric charge. The mineralization rate increased in acid medium and at higher temperature since the increase in temperature favors the generation reactions of persulfate. These conditions led to the highest levels of current efficiencies and lower energy consumed.Keywords: boron-doped diamond electrode; Reactive Black 5; Reactive Blue 19; decolorization; hydroxyl radical; persulfate. INTRODUÇÃOOs corantes sintéticos são compostos de extrema importância para o setor industrial, principalmente, para as indústrias têxteis que são responsáveis pela enorme descarga de efluentes contendo corantes e outros resíduos indesejáveis, sendo potenciais poluidoras ambientais. 1-4Os efluentes têxteis apresentam alta demanda química e biológica de oxigênio, elevada salinidade e intensa coloração devido à presença de corantes, os quais são fotolítica e quimicamente estáveis, podem exibir toxicidade aguda e serem carcinogênicos e/ou mutagênicos. Sendo assim, quando os corantes são descartados incorretamente no meio ambiente podem ocasionar problemas ambientais e, sobretudo, ser nocivos à saúde humana e dos animais. 5,6 Os corantes reativos, por exemplo, são solúveis em água, aniôni-cos e ligam-se às fibras do tecido por meio de ligações covalentes, pela reação de adição nucleofílica do grupo vinilsulfona ao grupo hidroxila da celulose, o que confere ao tecido tingido alta estabilidade da cor adquirida. 7,8 Entretanto, esses corantes apresentam baixa eficiência de fixação às fibras devido à competitividade de duas reações, a primeira sendo do grupo reativo vinilsulfona com as fibras e a segunda a reação de hidrólise do grupo vinilsulfona produzindo o 2-hidroxietilsulfona, que não se fixa a fibra e é perdido no efluente.9 As Figuras 1a e 1b ilustram as estruturas moleculares de dois corantes reativos, o Reativo Preto 5 (RP5) e o Azul (RA19), respectivamente, que apresentam como grupo reativo a sulfatoetilsulfonila.O corante RP5, com grupo cromóforo azo, é um dos corantes mais utilizados no tingimento de algodão, no qual emprega-se, aproximadamente, 40 g do corante dissolvidos em 70 a 150 L de água para cada kg de algodão tingido. 10 No entanto, ...

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“…As a result, a wide range of studies has been conducted on the identification and development of low-cost effective methods to control and remove these contaminations (5,6). Several processes, such as precipitation, chemical coagulation, ion exchange, adsorption (surface adsorption), chemical oxidation, membrane processes, and biological degradation processes, have been employed to remove dye from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Decolorization of reactive blue 19 from aqueous solutions by electrocoagulation process

Arghavan

Nabavian

Entezari

et al. 2018

JHST

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Background: Industrial wastewater contains several harmful chemicals, such as textile dyes, that are toxic to human and biological life. Accordingly, the wastewater from textile industry must be treated to minimize hazardous effects, including carcinogenic, mutagenic, teratogenic, coloring agent prior to disposal. The aim of the present study was to investigate the effect of electrocoagulation (EC) process for reactive blue 19 dye removal from aqueous solutions. Materials and Methods: In the current experimental study the electrocoagulation process was employed to remove reactive blue dye from aqueous solution using laboratory scale batch reactor. The electrodes were positioned vertically and parallel to each other. Two iron and two aluminum electrodes were used as anode and cathode, respectively. Different operating parameters, including current density (0.2, 0.5, 1.3, 2.6, 5.2 mA/cm 2 ), initial pH (3,5,7,9,11), initial dye concentration (10, 20, 30, 50, 100, 200 mg/l), and reaction time (10, 20, 30, 60 min), were tested with the synthetic wastewater in order to determine the optimal parameters. Results: The best-operating conditions were achieved at the current density of 0.5 mA/cm 2 , initial pH of 3, and the dye concentration of 30 mg/l. The optimum parameters at the batch-stirred EC system led to 92.26 % and 98.93% of decolorization after 20 and 60 min of operation, respectively. Conclusions: The results clearly showed that EC was an effective and operational process for reactive blue 19 removals.

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Anodic oxidation of a simulated effluent containing Reactive Blue 19 on a boron-doped diamond electrode

Cited by 46 publications

References 30 publications

Fabrication of cerium-doped lead dioxide anode with improved electrocatalytic activity and its application for removal of Rhodamine B

Fabrication of cerium-doped lead dioxide anode with improved electrocatalytic activity and its application for removal of Rhodamine B

Electrochemical Oxidation of Reactive Black 5 and Blue 19 Dyes Using a Non Commercial Boron-Doped Diamond Electrode

Decolorization of reactive blue 19 from aqueous solutions by electrocoagulation process

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