Electrosorption-promoted photodegradation of opaque wastewater on a novel TiO(2)/carbon aerogel electrode.
A novel electrosorption-photocatalysis synergistic electrode of TiO(2)/carbon aerogel (TiO(2)/CA) is prepared. The thermal stability and dispersion of the anatase TiO(2) particles are well facilitated by the porous and discontinuous microstructure of CA. The degradation experiments show that the TiO(2)/CA material is not only a good photocatalyst but also an excellent electrosorptive electrode. The TiO(2)/CA is easily molded to an agglomerate electrode. The opaque wastewater with dyestuff is degraded effectively by the electrosorption-promoted photocatalytic process on this electrode. For the simulated methylene blue (MB) wastewater (150 mg L(-1)), the rate constant of MB degradation in the electro-assisted photocatalytic process with the conventional ITO-supported TiO(2) (TiO(2)/ITO) is 0.55 x 10(-3) min(-1) and that the electrosorption-promoted photocatalysis with TiO(2)/CA is 10.27 x 10(-3) min(-1), which is 18 times the former. In the electrosorption-promoted photocatalytic process with TiO(2)/CA, the energy consumption removing per unit TOC is only 15% of that in the electro-assisted photocatalysis with TiO(2)/ITO, because the electrosorption is a nonfaradic process irrelative to any electron transfer and requires very low consumption. This study provides a new method for exploring highly efficient electrosorption-promoted photocatalytics technology in the treatment of opaque wastewater.
Wu
Meifen
M
Department of Chemistry, Tongji University, 1239 Siping Road, 200092 Shanghai, China.
Jin
Yuning
Y
Zhao
Guohua
G
Li
Mingfang
M
Li
Dongming
D
D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D004566:Electrodes; D005782:Gels; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D010782:Photolysis; D016060:Sorption Detoxification / Q000379:methods*; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D005782:Gels; C009495:titanium dioxide; D002244:Carbon; D014025:Titanium