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Improved degradation of the aqueous flutriafol using a nanostructure macroporous PbO2 as reactive electrochemical membrane.
- Source :
-
Electrochimica Acta . Nov2017, Vol. 253, p357-367. 11p. - Publication Year :
- 2017
-
Abstract
- In order to develop an electrochemical technology with low-energy consumption for water treatment applications, we fabricated a novel reactive electrochemical membrane (REM) operated in cross-flow filtration mode. The REM with three-dimensional ordered macroporous PbO 2 (3DEM-PbO 2 ) film was synthesized via templated deposition that was based on a porous Ti substrate. Compared to conventional flat Ti/PbO 2 (F-Ti/PbO 2 ) electrode, the 3DEM-PbO 2 possessed larger specific surface area (38.89 m 2 g −1 ), higher oxygen evolution potential (OEP, 1.9 V), larger Voltammetric charge (238 mC cm −2 ) and smaller electron transfer resistance (1.43 Ω). Furthermore, advection-enhanced mass transfer was obtained when the 3DEM-PbO 2 REM is operated in an electrochemical filtration reactor (EFR), relative to a traditional batch reactor (BR). The electrochemical mineralization experiments with flutriafol (FTF) demonstrated that the 3DEM-PbO 2 REM operated in the EFR was active for FTF and TOC removal at a low current density of 5 mA cm −2 . The oxidation current efficiency of REM operated in a EFR was much higher than that of conventional electrochemical system, and the corresponding energy consumption was lower (0.0505 kWh g −1 FTF, at FTF removal of 75%). The hydroxyl radicals (·OH) production and its utilization rate of the REM was significantly improved, resulting from a combination of the strong catalytic activity of 3DEM-PbO 2 and the enhanced mass transfer by filtration mode. Furthermore, computational fluid dynamics (CFD) method was carried out to help explain the improvement of oxidation performance with 3DEM-PbO 2 REM in a EFR. Eventually, the electrocatalysis experiments of practical wastewater demonstrated the extreme promise of 3DEM-PbO 2 REM for tailwater advanced treatment applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 253
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 125705469
- Full Text :
- https://doi.org/10.1016/j.electacta.2017.09.055