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Journal of Environmental Health Science and Engineering

, 15:11

First Online: 25 May 2017Received: 04 February 2016Accepted: 16 May 2017DOI: 10.1186-s40201-017-0273-3

Cite this article as: Najafpoor, A.A., Davoudi, M. & Rahmanpour Salmani, E. J Environ Health Sci Engineer 2017 15: 11. doi:10.1186-s40201-017-0273-3


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, sodium chloride concentration 2500–12,500 mg L, 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, NaCl = 7914.29 mg.L, 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 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.

KeywordsCellulosic separator Electro-oxidation Electro-reduction Graphite anodes Reactive red 120 AbbreviationsANOVAAnalysis of variance

AOAnodic oxidation

AOPsAdvanced oxidation processes

CCDCentral composite design

CODChemical oxygen demand

DDWDouble distilled water

EAOPsElectrochemical advanced oxidation processes





FTIRFourier transform infrared spectroscopy

H2SO4Sulfuric acid

NaClSodium chloride

NaOHSodium hydroxide

PIPrediction interval

RR120Reactive red 120

RSMResponse surface methodology

Autor: Ali Asghar Najafpoor - Mojtaba Davoudi - Elham Rahmanpour Salmani


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