Electrochemical removal of synthetic textile dyes from aqueous solutions using Ti/Pt anode: role of dye structure

Araújo, Cynthia Kérzia Costa de; Oliveira, Gustavo Rodrigues; Fernandes, Nedja Suely; Zanta, Carmem Lúcia de Paiva e Silva; Castro, Sonia; Silva, Djalma Ribeiro da; Martínez‐Huitle, Carlos A.

doi:10.1007/s11356-014-2918-4

Cited by 46 publications

(7 citation statements)

References 36 publications

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“…The • OH attack leads to the pollutant hydroxilation and the subsequent cleavage of the azo bond (the cromophore group) (Vasconcelos et al 2015). In this frame, the enhancement on the decolorization efficiency is directly related to the functional groups and their position in the molecular structure of these dyes (Garcia-Segura et al 2011;Araújo et al 2014;Vasconcelos et al 2015). In fact, this effect is more significant when more clear changes are observed in the chemical structure.…”

Section: Resultsmentioning

confidence: 99%

Functional group influences on the reactive azo dye decolorization performance by electrochemical oxidation and electro-Fenton technologies

Soares

Silva

Nascimento

et al. 2017

Environ Sci Pollut Res

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Electrochemical water treatment technologies are highly promising to achieve complete decolorization of dyebath effluents, as demonstrated by several studies reported in the literature. However, these works are focused on the treatment of one model pollutant and generalize the performances of the processes which are not transposable since they depend on the pollutant treated. Thus, in the present study, we evaluate, for the first time, the influence of different functional groups that modify the dye structure on the electrochemical process decolorization performance. The textile azo dyes Reactive Orange 16, Reactive Violet 4, Reactive Red 228, and Reactive Black 5 have been selected because they present the same molecular basis structure with different functional groups. The results demonstrate that the functional groups that reduce the nucleophilicity of the pollutant hinder the electrophilic attack of electrogenerated hydroxyl radical. Thereby, the overall decolorization efficiency is consequently reduced as well as the decolorization rate. Moreover, the presence of an additional chromophore azo bond in the molecule enhances the recalcitrant character of the azo dyes as pollutants. The formation of a larger and more stable conjugated π system increases the activation energy required for the electrophyilic attack of OH, affecting the performance of electrochemical technologies on effluent decolorization.

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Section: Resultsmentioning

confidence: 99%

Functional group influences on the reactive azo dye decolorization performance by electrochemical oxidation and electro-Fenton technologies

Soares

Silva

Nascimento

et al. 2017

Environ Sci Pollut Res

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“…Besides the economic benefits, these industries release a large amount of highly toxic dyes in wastewater every year, most of which have negative effects on human and animal health. Various techniques such as adsorption [1][2][3][4], catalysis [5,6], electrochemical oxidation [7], ozonation [8], membrane filtration [9], biological treatment [10], and enzymes [11] have been used to remove the dye components from polluted wastewater. Phenol red is a fabric dye and if we are exposed to the dye, it will affect the respiratory system and human skin [12].…”

Section: Introductionmentioning

confidence: 99%

Phenol Red Adsorption from Aqueous Solution on the Modified Bentonite

Linh

Dương

Duc

et al. 2020

Journal of Chemistry

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In the present work, the modified bentonites were prepared by the modiﬁcation of bentonite with cetyltrimethylammonium bromide (CTAB), both cetyltrimethylammonium bromide and hydroxy-Fe cations and both cetyltrimethylammonium bromide and hydroxy-Al cations. X-ray diffraction (XRD), thermal analysis (TG-DTA), infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and nitrogen adsorption/desorption isotherms were utilized to characterize the resultant modified bentonites. The modified bentonites were employed for the removal of phenol red dye from aqueous solution. Phenol red adsorption agreed well with the pseudo-second-order kinetic model. The equilibrium data were analyzed on the basis of various adsorption isotherm models, namely, Langmuir, Freundlich, and Dubinin‒Radushkevich models. The highest monolayer adsorption capacity of phenol red at 30°C derived from the Langmuir equation was 166.7 mg·g−1, 125.0 mg·g−1, and 100.0 mg·g−1 for CTAB‒bentonite, Al‒CTAB‒bentonite, and Fe‒CTAB‒bentonite, respectively. Different thermodynamic parameters were calculated, and it was concluded that the adsorption was spontaneous (∆G° < 0) and endothermic (∆H° > 0), with increased entropy (∆S° > 0) in all the investigated temperature ranges.

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“…where C 0 is the initial RB19 concentration (mg L À1 ), t is the EC treatment time (min), V is the voltage between the electrodes (Vpp), and Y is the RB19 removal efficiency (%) 33 that is calculated using eqn (2). 3.5.4.…”

Section: Energy Consumptionmentioning

confidence: 99%

Electrochemical degradation of RB19 dye using low-frequency alternating current: effect of a square wave

Hoseinzadeh

Rezaee

2015

RSC Adv.

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Electrochemical removal of synthetic textile dyes from aqueous solutions using Ti/Pt anode: role of dye structure

Cited by 46 publications

References 36 publications

Functional group influences on the reactive azo dye decolorization performance by electrochemical oxidation and electro-Fenton technologies

Functional group influences on the reactive azo dye decolorization performance by electrochemical oxidation and electro-Fenton technologies

Phenol Red Adsorption from Aqueous Solution on the Modified Bentonite

Electrochemical degradation of RB19 dye using low-frequency alternating current: effect of a square wave

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