Electrocatalytic properties of Ti-supported Pt for decolorizing and removing dye from synthetic textile wastewaters

Oliveira, Gustavo Rodrigues; Fernandes, Nedja Suely; Melo, Jorge Dantas de; Silva, Djalma Ribeiro da; Urgeghe, Christian; Martínez‐Huitle, Carlos A.

doi:10.1016/j.cej.2010.12.070

Cited by 94 publications

(30 citation statements)

References 30 publications

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“…(19), the average amount of consumed energy for the removal of RR120 in the designed electrochemical cell was 1.65 kwhm −3 that was remarkably lower than consumed energy in similar studies [4, 5, 11]. Furthermore, it was proved that energy consumption is proportional to the current intensity and electrolysis time and also the combined effect of these two factors.…”

Section: Resultsmentioning

confidence: 73%

Decolorization of synthetic textile wastewater using electrochemical cell divided by cellulosic separator

Najafpoor

Davoudi

Salmani

2017

J Environ Health Sci Engineer

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BackgroundAnnually, large quantities of dyes are produced and consumed in different industries. The discharge of highly colored textile effluents to the aquatic environments causes serious health problems in living organisms. This paper investigates the performance of each of the electro-oxidation and electro-reduction pathways in the removal of reactive red 120 (RR120) from synthetic textile effluents using a novel electrochemical reactor.MethodsIn the current study, a two-compartment reactor divided by cellulosic separator was applied in batch mode using graphite anodes and stainless steel cathodes. Central Composite Design was used to design the experiments and find the optimal conditions. The operational parameters were initial dye concentration (100–500 mg L−1), sodium chloride concentration (2500–12,500 mg L−1), electrolysis time (7.5–37.5 min), and current intensity (0.06–0.3 A).ResultsThe results showed that electro-oxidation was much more efficient than electro-reduction in the removal of RR120. According to the developed models, current intensity was the most effective factor on the electro-oxidation of RR120 as well as in power consumption (Coefficients of 12.06 and 0.73, respectively). With regard to the dye removal through electro-reduction, electrolysis time (coefficient of 8.05) was the most influential factor. Under optimal conditions (RR120 = 200 mg.L−1, NaCl = 7914.29 mg.L−1, current intensity = 0.12 A, and reaction time = 30 min), the dye was removed as 99.44 and 32.38% via electro-oxidation and electro-reduction mechanisms, respectively, with consuming only 1.21 kwhm−3 of electrical energy.ConclusionsAccording to the results, electro-oxidation using graphite anodes in a cell divided by cellulosic separator is very efficient, compared to electro-reduction, in the removal of RR120 from aqueous solutions.

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Section: Resultsmentioning

confidence: 73%

Decolorization of synthetic textile wastewater using electrochemical cell divided by cellulosic separator

Najafpoor

Davoudi

Salmani

2017

J Environ Health Sci Engineer

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“…Indeed, electrochemical oxidation using BDD anode could be a feasible process for produced waters generated by petrochemical industry in order to significantly reduce the cost and time of treatment (De Oliveira et al, 2011;Dos Santos et al, 2014).…”

Section: Relative Abundancementioning

confidence: 98%

Application of electrochemical technology for removing petroleum hydrocarbons from produced water using lead dioxide and boron-doped diamond electrodes

Gargouri

et al. 2014

Chemosphere

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“…Azo dyes are commercially important synthetic dyes, of which 20% to 40% are used in the textiles industry (Kariyajjanavar, Jogttappa, & Nayaka, 2011;de Oliveira et al, 2011). Methyl orange (MO) is a typical azo dye widely used in the textiles industry.…”

Section: Introductionmentioning

confidence: 99%

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

Adnan

Phattarapattamawong

2019

Water Environment Research

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This work aimed to enhance the photocatalytic degradation of methyl orange (MO) by crystallinity transformation of titanium dioxide (TiO2). In addition, the kinetic degradation of MO was determined. To transform its crystallinity, TiO2 was synthesized using a sol–gel method and calcined at between 200°C to 600°C. Calcination at a temperature of 250°C resulted in TiO2 that showed the best performance, corresponding to MO removal of 87% ± 7%. MO removal by TiO2 calcined between 250°C to 400°C was higher than for commercial TiO2 powder (Sigma‐aldrich) (62% ± 4%). TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO, while the specific surface area and surface roughness seemed to play a minor role. The photocatalytic degradation of MO was NaCl‐independent, while the photocatalytic activity increased with decreased pH. Reused TiO2 showed similar photocatalytic degradation of MO compared with pristine TiO2, at 84 ± 2%. The oxidation kinetics of TiO2 calcined at 250°C were fitted to the Langmuir–Hinshelwood model (R2 = 0.9134). The kr and Ks values were 0.027 mg L−1 min−1 and 0.621 L/mg, respectively. Crystallinity transformation was a major factor in the enhancement of photocatalytic degradation of MO. Practitioner points Photocatalytic activity of TiO2 depends on calcination temperature, pH, and a number of UVC lamps. TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO.

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Electrocatalytic properties of Ti-supported Pt for decolorizing and removing dye from synthetic textile wastewaters

Cited by 94 publications

References 30 publications

Decolorization of synthetic textile wastewater using electrochemical cell divided by cellulosic separator

Decolorization of synthetic textile wastewater using electrochemical cell divided by cellulosic separator

Application of electrochemical technology for removing petroleum hydrocarbons from produced water using lead dioxide and boron-doped diamond electrodes

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

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