Mineralization of organic pollutants by anodic oxidation using reactive electrochemical membrane synthesized from carbothermal reduction of TiO2

Autor: Christel Causserand, Jean-Christophe Rouch, Clément Trellu, Matthieu Rivallin, Marc Cretin, Roseline Esmilaire, Clémence Coetsier
Přispěvatelé: Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université de Montpellier (FRANCE), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institut Européen des membranes (IEM), Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Environmental Engineering
Mineralization
Membrane permeability
Anodic oxidation
Oxalic acid
02 engineering and technology
010501 environmental sciences
Electrochemistry
01 natural sciences
7. Clean energy
Organic compound
chemistry.chemical_compound
Electron transfer
[CHIM.GENI]Chemical Sciences/Chemical engineering
Phenol
Génie chimique
[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering
Electro-oxidation
Génie des procédés
Waste Management and Disposal
0105 earth and related environmental sciences
Water Science and Technology
Civil and Structural Engineering
chemistry.chemical_classification
[SDE.IE]Environmental Sciences/Environmental Engineering
Ecological Modeling
Mineralization (soil science)
021001 nanoscience & nanotechnology
Pollution
6. Clean water
Membrane
chemistry
Chemical engineering
13. Climate action
Organic pollutants
0210 nano-technology
Reactive electrochemical membrane
Sub-stoichiometric titanium oxide
Zdroj: Water Research
Water Research, IWA Publishing, 2018, 131, pp.309-319. ⟨10.1016/j.watres.2017.12.070⟩
ISSN: 0043-1354
DOI: 10.1016/j.watres.2017.12.070⟩
Popis: International audience; Reactive Electrochemical Membrane (REM) prepared from carbothermal reduction of TiO2 is used for the mineralization of biorefractory pollutants during filtration operation. The mixture of Ti4O7 and Ti5O9 Magnéli phases ensures the high reactivity of the membrane for organic compound oxidation through •OH mediated oxidation and direct electron transfer. In cross-flow filtration mode, convection-enhanced mass transport of pollutants can be achieved from the high membrane permeability (3300 LMH bar-1). Mineralization efficiency of oxalic acid, paracetamol and phenol was assessed as regards to current density, transmembrane pressure and feed concentration. Unprecedented high removal rates of total organic carbon and mineralization current efficiency were achieved after a single passage through the REM, e.g. 47 g m-2 h-1 - 72% and 6.7 g m-2 h-1 - 47% for oxalic acid and paracetamol, respectively, at 15 mA cm-2. However, two mechanisms have to be considered for optimization of the process. When the TOC flux is too high with respect to the current density, aromatic compounds polymerize in the REM layer where only direct electron transfer occurs. This phenomenon decreases the oxidation efficiency and/or increases REM fouling. Besides, O2 bubbles sweeping at high permeate flux promotes O2 gas generation, with adverse effect on oxidation efficiency.
Databáze: OpenAIRE
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