Sol–gel titanium oxides sensitized by nanometric carbon blacks: Comparison with the optoelectronic and photocatalytic properties of physical mixtures

Preparation and characterization of carbon covered TiO2 using sucrose for solar photodegradation

“…Carbon presence always influences the degree of crystallinity which has a bearing on the photocatalytic sites and hence the activity. Rincón et al [18] also reported that below 873 K only anatase phase exits and no rutile.…”

Comparative electrochemical degradation of the triphenylmethane dye Methyl Violet with boron-doped diamond and Pt anodes

“…In the case of Pt, results of Fig. 6b suggest the existence of a comparatively much lower enhancement of parasitic reactions (6), (7) and (9) with rising current density, so that the small relative proportion of reactive Pt( Å OH) produced at each j remains almost unaltered leading to TOC-Q plots practically j-independent.…”

“…However, it can be accounted for by the high reactivity of these radicals, which can be lost by parallel non-oxidizing waste reactions. It is well-known [14,15,18,20,22] that electrogenerated Å OH can evolve to O 2 (first and foremost) by reaction (6) or can dimerize to H 2 O 2 by reaction (7). This species can then be anodically oxidized to O 2 from reaction (8) or can react with Å OH to yield hydroperoxyl radical (HO 2 Å ) via reaction (9) …”

“…Several papers have reported the partial removal of MV and its by-products in aqueous medium by means of biodegradation by Pseudomonas [4], adsorption with granulated agricultural wastes [2,3,5] and several advanced oxidation processes (AOPs) such as sonochemical degradation [6], UV photocatalysis with TiO 2 /carbon black composites [7] and Ag-loaded TiO 2 [8], solar photocatalysis with TiO 2 [9], porous K 3 PW 12 O 40 [10], Co-doped mesoporous silica [11] and Ce-doped FSM-16 [12] and glow discharge electrolysis involving Fenton's reagent (H 2 O 2 /Fe 2+ ) [13]. AOPs based on the in situ generation of hydroxyl radical ( Å OH) as the main oxidizing species are promising environmentally friendly techniques for 0022-0728/$ -see front matter Ó 2008 Elsevier B.V. All rights reserved.…”

Preparation and characterization of porous C-modified anatase titania films with visible light catalytic activity

“…C-modified or C-doped TiO 2 could be synthesized by various techniques, such as hydrolysis [8], sol-gel [9,10], carbonization under CO gas or ethanol environment [11,12], oxidative annealing of TiC [13,14], magnetron sputtering [15,16]. Chemically modified n-type TiO 2 [4] was synthesized by using controlled combustion of Ti metal in a natural gas flame, and the resulting photocatalyst could absorb UV and most of the visible light o535 nm.…”