A kinetic model for photocatalytic degradation of organic contaminants in a thin-film TiO2 catalyst

Chang, H. T.; Wu, Nan-Min; Zhu, Faqing

doi:10.1016/s0043-1354(99)00247-x

Cited by 135 publications

(63 citation statements)

References 19 publications

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“…Research using this band gap engineering approach has been carried out successfully and resulted in the emergence of new photocatalytic materials for water-splitting purposes including Bi 3+ , Ti 4+ and W 6+ [78,79]. From the various studies carried out on doping and the effect of doping, it is obvious that the exploration of new photocatalytic doping materials will continue to be driven mainly by efforts in water splitting reactions although these materials will find relevance in other photocatalytic applications such as PbBi 2 Nb 2 O 9 , for the treatment or remediation of aqueous pollutants, CaBi 2 O 4 for the oxidation of gaseous pollutants and ZnGa 2 O 4 for the reduction of carbon dioxide and similar materials [77,80,81].…”

Section: Doping Mechanismsmentioning

confidence: 99%

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Heterogeneous Photocatalysis: Recent Advances and Applications

2013

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Semiconductor heterogeneous photocatalysis, the subject of this review, is a versatile, low-cost and environmentally benign treatment technology for a host of pollutants. These may be of biological, organic and inorganic in origin within water and air. The efficient and successful application of photocatalysis demands that the pollutant, the catalyst and source of illumination are in close proximity or contact with each other. The ability of advanced oxidation technology to remove low levels of persistent organic pollutants as well as microorganisms in water has been widely demonstrated and, progressively, the technology is now being commercialized in many areas of the world including developing nations. This review considers recent developments in the research and application of heterogeneous semiconductor photocatalysis for the treatment of low-level concentrations of pollutants in water and air using titanium dioxide as a "model" semiconductor. The review considers charge transport characteristics on the semiconductor surface, photocatalyst reactor design and organic degradation mechanistic pathways. The effects of photoreactor operating parameters on the photocatalytic process are discussed in addition to mineralization and disinfection kinetics.

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Section: Doping Mechanismsmentioning

confidence: 99%

“…The smaller the particle size, the larger the surface area, and the higher the expected activity [81]. This can be explained in terms of an increase in the number of active sites per square meter as well as greater absorbance of the pollutant on the catalyst surface [80].…”

Section: Morphology Of Photocatalyst Materialsmentioning

confidence: 99%

Heterogeneous Photocatalysis: Recent Advances and Applications

2013

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“…It means that amount of absorbed incident photons by the TNT films will not further increase when the tube length exceeds a certain range. Actually, the existence of the optimal thickness of TiO 2 films for degrading organic pollutants in water [28] also demonstrated the limitation of the UV light penetration. In this study, the length of nanotubes corresponds to the thickness of films mentioned in previous literature [27,29].…”

Section: Effect Of the Length Of Tio 2 Nanotubesmentioning

confidence: 99%

Effects of structure of anodic TiO2 nanotube arrays on photocatalytic activity for the degradation of 2,3-dichlorophenol in aqueous solution

Liang

2009

Journal of Hazardous Materials

179

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In this study titanium dioxide nanotube (TNT) arrays were prepared by an anodic oxidation process with post-calcination. The morphology and structure of the TNT films were studied by FESEM, XRD, and XPS. Photocatalytic activity of the TNT films was evaluated in terms of the degradation of 2,3-dichlorophenol in aqueous solution under UV light irradiation. The effects of the nanotube structure including tube length and tube wall thickness, and crystallinity on the photocatalytic activity were investigated in details. The results showed that the large specific surface area, high pore volume, thin tube wall, and optimal tube length would be important factors to achieve the good performance of TNT films. Moreover, the TNT films calcined at 500 o C for 1 h with the higher degree of crystallinity exhibited the higher photocatalytic activity than other TNT films calcined at 300 o C and 800 o C. Consequently, these results indicate that the optimization of TiO 2 nanotube structures is critical to achieve the high performance of photocatalytic reaction.

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“…It is known to have superb pigmentary properties, high adsorption in the ultraviolet region, and high stability which allows it to be used in various applications such as electroceramics, glass, and photocatalytic purification of chemical in air and water. Two types of reactors have been developed which are suspension/slurry and thin film/fixed in wastewater treatment (Chang et al, 2000;Huang et al, 1999;. The details of these two reactors will be discussed later.…”

Section: Mechanisms Of Generating Oxidizing Speciesmentioning

confidence: 99%