Application of Doehlert matrix to the study of electrochemical oxidation of Cr(III) to Cr(VI) in order to recover chromium from wastewater tanning baths

Ouejhani, A.; Hellal, Fayçal; Dachraoui, M.; Lallevé, G.; Fauvarque, Jean‐François

doi:10.1016/j.jhazmat.2008.01.046

Cited by 34 publications

(17 citation statements)

References 24 publications

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“…Several methods for removal of Cr(VI) from wastewater have been reported, including chemical precipitation [6], oxidation [7], ion exchange [8], reverse osmosis [9] and solvent extraction [10].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(VI) using Fe-crosslinked chitosan complex (Ch-Fe)

Zimmermann

Mecabô

Fagundes

et al. 2010

Journal of Hazardous Materials

168

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Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(VI) using Fe-crosslinked chitosan complex (Ch-Fe)

Zimmermann

Mecabô

Fagundes

et al. 2010

Journal of Hazardous Materials

168

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“…Taking into account possible interactions between the operating conditions, a multivariate method was used [39][40][41]. Doehlert matrix was selected for its interesting properties [42][43][44][45]. It presents a uniform distribution of experimental points in the studied field.…”

Section: Doehlert Optimization For Bismuth Sulfide Thin Films Growthmentioning

confidence: 99%

Annealing study and thermal investigation on bismuth sulfide thin films prepared by chemical bath deposition in basic medium

Dachraoui

Merino

Mami³

et al. 2018

Appl. Phys. A

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Bismuth sulfide thin films were prepared by chemical bath deposition using thiourea as sulfide ion source in basic medium. First, the effects of both the deposition parameters on films growth as well as the annealing effect under argon and sulfur atmosphere on asdeposited thin films were studied. The parameters were found to be influential using the Doehlert matrix experimental design methodology. Ranges for a maximum surface mass of films (3 mg cm-2) were determined. A well crystallized major phase of bismuth sulfide with stoichiometric composition was achieved at 190°C for 3 hours. The prepared thin films were characterized using Grazing Incidence X-ray diffraction (GIXRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray analysis (EDX). Second, the band gap energy value was found to be 1.5 eV. Finally, the thermal properties have been studied for the first time by means of the electropyroelectric (EPE) technique. Indeed, the thermal conductivity varied in the range of 1.20-0.60 W m-1 K-1 while the thermal diffusivity values increased in terms of the annealing effect ranging from 1.8 to 3.5 10-7 m 2 s-1 .

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“…Moreover, it is noted that the maximum of the three studied response (R c , % COD removal, % TOC removal) would be obtained with increasing not only the electrolysis time but also the current intensity. However, it is noted that the increase of the current intensity leads to the precipitation of the trivalent chromium (greenish solid) at the cathode surface [12,22]. This solid, which adheres to the cathode, causes the passivity of the electrode and increases the electrolysis voltage.…”

Section: Treatment Of the Tanning Effluentmentioning

confidence: 99%

“…Among them, the precipitation of trivalent chromium [1,2], electro coagulation [3][4][5], membrane filtration [6][7][8], ion exchange [9], electrochemical methods [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%