Journal ArticleDOI
Visible light photodegradation of 4-chlorophenol with a coke-containing titanium dioxide photocatalyst
TLDR
In this article, a modified sol-gel process using different alkoxide precursors was used to obtain carbon-containing catalysts with large surface areas, capable to photodegrade p-chlorophenol (4CP) with visible light (λ>400nm).Abstract:
Photocatalysts based on titanium dioxide have been prepared by a modified sol–gel process using different alkoxide precursors. Depending on the precursor and the calcination temperature of the gels, carbon-containing catalysts with large surface areas, capable to photodegrade p-chlorophenol (4CP) with visible light (λ>400 nm), have been obtained. Photodegradation and mineralisation were confirmed by HPLC and TOC measurements. The catalysts were characterised by physisorption of argon, elemental analysis, EPR, UV/VIS, X-ray powder diffraction (XRD), FT-IR and high-resolution transmission electron microscopy (HRTEM). A highly condensed, carbonaceous species formed during calcination is responsible for the photosensitisation. When used as a photoelectrode, the appearance of a photocurrent indicated the semiconductor nature of these novel materials. The catalysts exhibit a surprisingly good long-time stability despite of the carbonaceous nature of the sensitising species. It is also shown, that commercially available TiO2 can be photosensitised by impregnation with suitable alcohols followed by pyrolysis.read more
Citations
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Journal ArticleDOI
Photoinduced reactivity of titanium dioxide
TL;DR: In this paper, photo-induced superhydrophilicity was used on the surface of a wide-band gap semiconductor like titanium dioxide (TiO 2 ) for photocatalytic activity towards environmentally hazardous compounds.
Journal ArticleDOI
Daylight photocatalysis by carbon-modified titanium dioxide
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Review on Modified TiO2 Photocatalysis under UV/Visible Light: Selected Results and Related Mechanisms on Interfacial Charge Carrier Transfer Dynamics
S. Girish Kumar,L. Gomathi Devi +1 more
TL;DR: This review encompasses several advancements made in these aspects of titania, and also some of the new physical insights related to the charge transfer events like charge carrier generation, trapping, detrapping, and their transfer to surface are discussed for each strategy of the modified titania to support the conclusions derived.
Journal ArticleDOI
Visible light induced photocatalytic degradation of organic pollutants
TL;DR: In this paper, the role of Fe(II)/Fe(III) species in the sensitization process of various substrates helping it in the process to photocatalytic degradation reactions of organic pollutants has been highlighted.
Journal ArticleDOI
Carbonaceous nanomaterials for the enhancement of TiO2 photocatalysis
Rowan K. Leary,Aidan Westwood +1 more
TL;DR: In this paper, a review of the literature on nanocarbon-TiO2 photocatalysts is presented, highlighting recent progress in the development of carbon dioxide photocatalyst.
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