Surface modification of TiO2 nanoparticles for selective photodecomposition of nitrobenzene

Olga V. Makarova, Tijana Rajh, Marion C. Thurnauer, Patricia A. Kemme, Donald Cropek

Research output: Contribution to journalConference articlepeer-review

Abstract

Nitroaroaromatic compounds, e.g., nitrobenzene (NB), are of special interest since they are found in waste streams. Selective decomposition of the nitroaromatic compounds would be desirable to increase the rate of remediation and allow reuse or recycle of the less hazardous constituents. A study on the surface modification of TiO2 particles with specific chelating agents that may enhance both TiO2 redox properties and adsorption of nitroaromatic compounds for selective, photocatalytic removal of nitroaromatics from waste streams was carried out. NB adsorption and photodecomposition in the presence of phenol (Ph) over bare and arginine-modified nanocrystalline TiO2 were carried out. The presence of arginine on TiO2 colloids suppressed oxidation of Ph. When both NB and Ph were present in arginine modified colloids, a weakly resolved spectrum of hole localized on carboxyl group of arginine and electrons localized on the lattice trapping sites of TiO2 nanoparticles were observed. Radical formation was reversible and no destruction of arginine occurred in agreement with chromatographic data. When NB was added to the arginine modified sample, the signal for trapped holes was altered indicating that the -NH- group participates in binding of NB, removing this site as a hole trapping center. This is an abstract of a paper presented at the 222nd ACS National Meting (Chicago, IL 8/26-30/2001).

Original languageEnglish (US)
Pages (from-to)390-394
Number of pages5
JournalACS Division of Environmental Chemistry, Preprints
Volume41
Issue number2
StatePublished - 2001
Externally publishedYes
Event222nd ACS National Meeting - Chicago, IL, United States
Duration: Aug 26 2001Aug 30 2001

ASJC Scopus subject areas

  • Chemical Engineering(all)

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