TiO2-mediated photodegradation of liquid and solid organic compounds

Minabe, Toshihiro; Tryk, Donald A.; Sawunyama, Phillip; Kikuchi, Yoshihiko; Hashimoto, Kazuhito; Fujishima, Akira

doi:10.1016/s1010-6030(00)00350-6

Cited by 165 publications

(108 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…TiO2 semiconductor has become, by the combination of these two types of reactions, a potential application in waste-water treatment. The partial transformation or mineralization of the pollutants by the action of a semiconductor, is based on the generation of electron-hole pairs and subsequent recombination processes of interfacial charge transfer (oxidative or reductive) that promote the oxidation of a variety of pollutants and inactivation of microorganism in short periods of time (4,5).…”

Section: Introductionmentioning

confidence: 99%

“…Substitution decreases cation migration to the surface of the semiconductor, acting as an obstruction to the photocatalytic process. This is also known as semiconductor poisoning (4). On the other hand, selection of the growth method should also be considered.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, selection of the growth method should also be considered. A variety of methods have been reported, but some are expensive, require special equipment, and the development of large-scale films is difficult to implement (4,5). A good option for film growth is the sedimentation method under the action of gravitational forces.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

et al. 2012

View full text Add to dashboard Cite

Objective. Removal and detoxification of azo dye by photocatalysis with TiO 2 . Materials and methods. TiO 2 films were prepared by sedimentation at pH 1.3, using as support a borosilicate glass, annealed for 1 hour at 450 °C. Physical characterization was performed by Scanning Electron Microscopy, X-ray diffraction and UV/VIS spectrometry. Dye Black Reactive 5 removal was carried-out in a quartz photo-reactor. Results. Optical characterization revealed the films displayed evident TiO 2 spherical particles of various irregular sizes, porous, and without fractures. The average crystal size was 77.5 nm and 77.7 nm for 50 °C (dried temperature) and 450 ºC (annealed temperature) respectively. The energy of the band gap (GAP) was 3.02 and 2.68 eV respectively. Maximum concentration of dye that negatively affected color removal was 80 mg/L (17%). At lower dye's concentrations (10, 50 and 70mg/L) decolorization was greater than 80%. TiO 2 films were reused for five consecutive cycles of 6 hours at 10 mg/L (>80%), and three cycles of 10 hours at 70 mg/L (> 80%). Toxicity results demonstrate that Daphnia magna was more sensitive than Lactuca sativa. Conclusions. TiO 2 films obtained by sedimentation demonstrated a high reactive black 5 decolorization and COD removal (86% and 100%), as well as toxicity reduction.Key words: photocatalysis with TiO 2 , sedimentation techniques, reactive black 5, Lactuca sativa and Daphnia magna. ResumenDecoloración simultánea y la desintoxicación de reactivo negro 5 con TiO 2 depositadas sobre el vidrio de borosilicato por la técnica de sedimentación. Objetivo. Decolorización y disminución de la toxicidad de un azo colorante usando fotocatálisis con TiO 2 . Materiales y métodos. Las películas de TiO 2 fueron crecidas por sedimentación a pH 1,3 empleando vidrio de borosilicato como sustrato. La caracterización física se realizó por medio de microscopía electrónica de barrido, difracción de rayos X y espectrometría de absorción UV/vis. Los estudios de remoción del colorante Negro Reactivo 5, se realizaron en un fotoreactor de cuarzo. Resultados. De acuerdo con la caracterización óptica, las películas de TiO 2 presentaron partículas esféricas, con diferentes tamaños, irregulares y sin fracturas. El tamaño del cristal fue 77,5 nm y 77,7 nm para 50 y 450º C y la energía de banda prohibida fue 3,02 y 2,68 eV, respectivamente. La concentración máxima del colorante que afectó negativamente la remoción de color fue 80 mg/L (17%). A concentraciones más bajas de NR5 (10, 50 y 70 mg/L) la decoloración fue superior al 80%. Las películas de TiO 2 se reutilizaron por 5 ciclos de 6 horas a 10 mg/L y 3 ciclos de 10 h a 70 mg/L. Los estudios de toxicidad en Lactuca sativa y Daphnia magna demostraron que D. magna fue más sensible que L. sativa. Conclusión. Las películas de TiO 2 crecidas por sedimentación decoloraron el colorante negro reactivo 5 en un 86% y removieron la demanda química de oxígeno en un y 100%, igualmente redujeron la toxicidad.Palabras clave: fotocatálisis con TiO 2 , técnica de sed...

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

et al. 2012

View full text Add to dashboard Cite

show abstract

“…And another advantage of photocatalytic technology is that it can be very cost effective because sunlight can be used as an energy source. [1][2][3][4][5] Semiconductor materials, such as TiO2, ZnO, SnO2, CdS, GaP, and WO 3 , are applied in photocatalysis. Among them, TiO 2 is the most popular for this purpose because it is nontoxic, chemically stable, inexpensive, and very efficient.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Activity of 3,4,9,10-Perylenetetracarboxylic Diimide Modified Titanium Dioxide Under Visible Light Irradiation

Kim¹,

Kim²,

Yu³

et al. 2010

Bulletin of the Korean Chemical Society

Self Cite

View full text Add to dashboard Cite

A method to improve the photocatalytic activity of titanium dioxide by modification with a sensitizer and a metal oxide is proposed. To achieve this goal, we used metal oxides as dopants. In particular, CaWO4 and Gd2O2S:Tb were used because their 2.6 eV and 2.2 eV band gap energy and optical properties have a large positive effect on photocatalysis. The improvement in the photocatalytic activity of TiO2 modified with Gd2O2S:Tb under ultraviolet light irradiation is described in a previous study. The present work focuses on the sensitization of metal oxide-modified TiO2. Having observed the ultraviolet-visible absorption spectra of 3,4,9,10-Perylenetetracarboxylic diimide in the wide visible-light region from 400 nm to 650 nm and the broad peaks in its photoluminescence spectra at 695 nm and 717 nm, we decided to use this perylene dye to sensitize modified TiO2 to enhance its activity as a visible-light harvesting photocatalyst. We also explored the positive effects thin-film surface changes stemming from ultraviolet pre-treatment have on photocatalytic activity. Finally, we subjected several metal oxide-modified TiO2 products sensitized by the perylene dye to ultraviolet pre-treatment, obtaining the most active photocatalysts.

show abstract

“…[5][6][7][8] As a model system for the photocatalytic reaction, the monolayers of long-chain organic molecules are both of practical and fundamental interests. 9 Understanding the photo-induced oxidation mechanism of organic thin-films is crucial for developing novel functional materials for environmental protection. Although the mechanism for the photocatalytic oxidations on the TiO 2 has been extensively investigated, 1-4 our knowledge about the photocatalytic oxidation of such monolayers on the TiO 2 surface is still limited at a molecular level.…”

mentioning

confidence: 99%

Photocatalytic oxidation of the organic monolayers on TiO₂ surface investigated by in-situ sum frequency generation spectroscopy

Tong

Peng

et al. 2015

APL Materials

View full text Add to dashboard Cite

TiO2-mediated photodegradation of liquid and solid organic compounds

Cited by 165 publications

References 24 publications

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

Enhanced Photocatalytic Activity of 3,4,9,10-Perylenetetracarboxylic Diimide Modified Titanium Dioxide Under Visible Light Irradiation

Photocatalytic oxidation of the organic monolayers on TiO₂ surface investigated by in-situ sum frequency generation spectroscopy

Contact Info

Product

Resources

About

TiO2-mediated photodegradation of liquid and solid organic compounds

Cited by 165 publications

References 24 publications

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

Simultaneous decolorization and detoxification of black reactive 5 using TiO2 deposited over borosilicate glass

Enhanced Photocatalytic Activity of 3,4,9,10-Perylenetetracarboxylic Diimide Modified Titanium Dioxide Under Visible Light Irradiation

Photocatalytic oxidation of the organic monolayers on TiO2 surface investigated by in-situ sum frequency generation spectroscopy

Contact Info

Product

Resources

About

Photocatalytic oxidation of the organic monolayers on TiO₂ surface investigated by in-situ sum frequency generation spectroscopy