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Solar light decomposition of DFP on the surface of anatase and rutile TiO2 prepared by hydrothermal treatment of microemulsions
Umeå University.
Chalmers University of Technology.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
Umeå University.
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2005 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 584, no 1, 98-105 p.Article in journal (Refereed) Published
Abstract [en]

The photocatalytic decomposition of diisopropylfluorophosphate (DFP) over nanostructured anatase and rutile TiO2 powder was investigated by FTIR and XPS. Upon irradiation with artificial solar light DFP decomposed on both polymorphs as evidenced by FTIR. For both crystalline structures acetone and subsequently coordinated formate and carbonate were observed on the surface during the photocatalytic reaction is the isopropyl groups dissociated from DFP. XPS revealed that small amounts of phosphates and inorganic fluoride (Ti-F) gradually built up on both TiO2 surfaces, while organic F was present only on the rutile phase. From repeated cycles of intermittent DFP adsorption and irradiation measurements, the decomposition rates and formation of residuals on the surface were deduced. It was found that the overall oxidation yield is higher on anatase than rutile. The oxidation rate decreases with increasing irradiation time. an effect that is more pronounced on rutile. We find that both the difference between the polymorphs and the initial decrease of the oxidation yield can largely be explained by variations in surface area rather than poisoning by POx or F species. In particular, we observe a dramatic decrease of the specific area or rutile as a function of photocatalytic oxidation cycle. (c) 2005 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2005. Vol. 584, no 1, 98-105 p.
Keyword [en]
titanium oxide, surface photochemistry, DFP, infrared absorption spectroscopy, X-ray photoelectron spectroscopy
National Category
Physical Chemistry Nano Technology
URN: urn:nbn:se:uu:diva-235917DOI: 10.1016/j.susc.2005.01.064ISI: 000229730300015OAI: oai:DiVA.org:uu-235917DiVA: diva2:762449
5th Nordic Conference on Surface Science (NCSS-5), SEP 22-25, 2004, Tampere, FINLAND
Available from: 2014-11-11 Created: 2014-11-11 Last updated: 2014-11-11

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