Electrochemical removal of Reactive Black 5 azo dye using non-commercial boron-doped diamond film anodes

Vasconcelos, Vanessa M.; Ribeiro, Francine L.; Migliorini, Fernanda L.; Alves, Suellen Aparecida; Steter, Juliana R.; Baldan, Maurício Ribeiro; Ferreira, N.G.; Lanza, Marcos R.V.

doi:10.1016/j.electacta.2015.07.133

Cited by 49 publications

(15 citation statements)

References 53 publications

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“…9). Similar differences between color and COD removal have been obtained by other authors when studying the degradation of dyes by electrocoagulation 20,21 , electrochemical oxidation 30,[60][61][62][63][64][65] , photocatalysis 9,11 photo-Fenton 19,57 or biological methods 13,66 .…”

supporting

confidence: 82%

Electrochemical Degradation of Reactive Black 5 using two-different reactor configuration

Droguett

Mora-Gómez

García-Gabaldón

et al. 2020

Sci Rep

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Novel Sb-doped SnO2 ceramic electrodes sintered at different temperatures, are applied to the degradation of Reactive Black 5 in both divided and undivided electrochemical reactors. In the undivided reactor the discoloration of the solution took place via the oxidation of RB5 dye, without the corresponding reduction in the chemical oxygen demand for the ceramic electrodes. However, in the divided one, it was possible to achieve the discoloration of the solution while at the same time decreasing the chemical oxygen demand through the ·OH-mediated oxidation, although the chemical oxygen demand degradation took place at a slower rate.

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supporting

confidence: 82%

Electrochemical Degradation of Reactive Black 5 using two-different reactor configuration

Droguett

Mora-Gómez

García-Gabaldón

et al. 2020

Sci Rep

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“…The results of Figure 5a,b have confirmed that Al 2 O 3 @-TiO 2 could degrade RB5 under UV light illumination. To investigate whether Al 2 O 3 @TiO 2 has similar photocatalytic ability with Ag 3 PO 4 under natural weak light irradiation, the UV-Vis adsorbance spectra of original RB5 dye, the equilibrium adsorption solution under natural indoor light and in dark for 24 h were displayed in Figure 5c, respectively, because the UV-Vis adsorbance spectrum could exhibits characteristic absorbance peaks of dyes and a decrease in band intensity could be observed under electrolysis [63] upon UV-C light irradiation [64]. As it shown the untreated RB5 presented main adsorption bands at 311,391 and 601 nm.…”

Section: •-mentioning

confidence: 99%

Decolorization of Reactive Black 5 by Mesoporous Al₂O₃@TiO₂ Nanocomposites

Deng

Zhang

Cao

et al. 2018

Env Prog and Sustain Energy

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In this study, mesoporous Al2O3@TiO2 nanocomposites were synthesized via two successive precipitation methods. Due to the coated TiO2 layer, the Al2O3@TiO2 exhibited a significantly enhanced efficiency for the removal of reactive black 5 dye (RB5). The morphology and compositional characteristics of Al2O3@TiO2 were investigated by TEM, HRTEM, XRD, EDS, FTIR, BET, and zeta‐potential analysis. TEM photos illustrated that TiO2 film covered Al2O3, XRD suggested compositional phases of γ‐Al2O3 and anatase TiO2, and BET measurement confirmed its characteristic of the mesoporous material. Al2O3@TiO2 was applied as an adsorbent to remove RB5 from aqueous solution, and the adsorption isotherms fitted well to the Langmuir isotherm model. The photocatalysis experiments confirmed that Al2O3@TiO2 had the good photocatalytic performance for degrading RB5 and the hydroxyl radical was the major active group. The UV–Vis adsorbance spectra demonstrated that this Al2O3@TiO2 could incompletely degrade RB5 dye under natural indoor light simultaneously when adsorption occurred. © 2018 American Institute of Chemical Engineers Environ Prog, 38: S230–S242, 2019

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“…Apesar disso, a ação dos persulfatos não pode ser negligenciada. 30 Adicionalmente, o espectro Raman do eletrodo em estudo apresentado por Vasconcelos et al 43 …”

Section: Influência Da Concentração Do Eletrólitounclassified

“…Total remoção de TOC pode ser obtida estendendo o tempo de eletrólise. 43 Rivera et al 47 também avaliaram o efeito da concentração de Na 2 SO 4 na oxidação de 0,4 L de solução contendo 70 mg L -1 de RP5 em uma célula cilíndrica com catodo e anodos de grafite. Segundo os autores, o aumento na concentração do eletrólito suporte de 0,001 a 0,1 mol L -1 aumentou significativamente a velocidade da reação, em que altas remoções de cor foram alcançadas em tempos menores de eletrólise.…”

Section: Figura 3 Decaimento Relativo (A) Absorbância (B) áRea Cromaunclassified

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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Electrochemical removal of Reactive Black 5 azo dye using non-commercial boron-doped diamond film anodes

Cited by 49 publications

References 53 publications

Electrochemical Degradation of Reactive Black 5 using two-different reactor configuration

Electrochemical Degradation of Reactive Black 5 using two-different reactor configuration

Decolorization of Reactive Black 5 by Mesoporous Al₂O₃@TiO₂ Nanocomposites

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

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Electrochemical removal of Reactive Black 5 azo dye using non-commercial boron-doped diamond film anodes

Cited by 49 publications

References 53 publications

Electrochemical Degradation of Reactive Black 5 using two-different reactor configuration

Electrochemical Degradation of Reactive Black 5 using two-different reactor configuration

Decolorization of Reactive Black 5 by Mesoporous Al2O3@TiO2 Nanocomposites

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

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Decolorization of Reactive Black 5 by Mesoporous Al₂O₃@TiO₂ Nanocomposites