title: Evaluation of the efficiency of monopolar and bipolar BDD electrodes for electrochemical oxidation of anthraquinone textile synthetic effluent for reuse.
abstract: The efficiency of the electrochemical degradation of synthetic wastewater containing an anthraquinone dye has been comparatively studied in two electrolytic cells with a synthetic boron-doped diamond (Si/BDD) as an anode. The first is an individual cell (Cell 1) with monopolar electrode BDD and the second (Cell 2) has two bipolar electrodes BDD self-polarized. The bulk electrolysis was performed at the same initial operating conditions in order to quantify the influence of the initial pH and current density on dye discoloration and global mineralization removal. The current efficiency and the consumption energy were also evaluated. When the same solutions have been comparatively treated with the two cells, a quite good mineralization is found in Cell 2. This result supposed more fraction of the applied current is used for the electrocombustion reaction on Cell 2 if compared to Cell 1 and small amount rest for the side reaction of oxygen evolution. The HPLC analyses confirmed this hypothesis and showed that the concentration trend of intermediates (sulfanilic acid, phthalate acid and salicylic acid) with electrolysis time was different on two cells. Phototoxicity tests show that the electrochemical oxidation with BDD electrodes could be useful as a pretreatment technique for reducing hazardous wastewater toxicity.
authors.affiliation: Laboratory of Wastewater Treatment, Centre of Water Research and Technologies (CERTE), Echopark Borj Cedria, B.P. 273, 8020 Soliman, Tunisia.
authors.forename: NourElHouda
authors.initials: N
authors.lastname: Abdessamad
authors.forename: Hanene
authors.initials: H
authors.lastname: Akrout
authors.forename: Ghaith
authors.initials: G
authors.lastname: Hamdaoui
authors.forename: Kais
authors.initials: K
authors.lastname: Elghniji
authors.forename: Mohamed
authors.initials: M
authors.lastname: Ksibi
authors.forename: Latifa
authors.initials: L
authors.lastname: Bousselmi
mesh_terms: D000880:Anthraquinones / Q000737:chemistry* / Q000633:toxicity; D004396:Coloring Agents / Q000737:chemistry* / Q000633:toxicity; D004149:Dioxoles / Q000737:chemistry; D004566:Electrodes; D010084:Oxidation-Reduction; D013784:Textiles; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry* / Q000633:toxicity; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity
chemical_list: D000880:Anthraquinones; D004396:Coloring Agents; D004149:Dioxoles; D062065:Wastewater; D014874:Water Pollutants, Chemical; C042834:9,10-anthraquinone; C041398:7,7'-dimethoxy-(4,4'-bi-1,3-benzodioxole)-5,5'-dicarboxylic acid dimethyl ester
keywords: Anodic oxidation; Anthraquinone dyes; BDD electrode; Bipolar electrode; Intermediates; Monopolar electrode