Photocatalytic reduction of 4-nitrophenol with arginine-modified titanium dioxide nanoparticles

Won Young Ahn, Sarah A. Sheeley, Tijana Rajh, Donald M. Cropek

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

The surface charge of titanium dioxide (TiO2) affects the adsorption rates of target molecules, thereby influencing the associated photocatalytic degradation rates of these molecules. This study describes the specific photocatalytic reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with arginine-modified TiO2 (Arg-TiO2) nanoparticles. 4-AP was the only identifiable by-product detected by chromatographic analysis. The terminal amine groups of the arginine monolayer create a positive TiO2 surface charge over a wide range of pH values. At high pH, the degradation rate of 4-NP increased due to improved target adsorption. Furthermore, the presence of the arginine monolayer perturbs the degradation mechanism distribution of 4-NP away from indiscriminant oxidation toward selective reduction. Photocatalysis of a target molecule such as benzenesulfonic acid (BSA) showed that while electrostatic attraction of the target to the photocatalyst is important, the reduction potential of the target molecule dictates efficient degradation on Arg-TiO2.

Original languageEnglish (US)
Pages (from-to)103-110
Number of pages8
JournalApplied Catalysis B: Environmental
Volume74
Issue number1-2
DOIs
StatePublished - Jun 18 2007
Externally publishedYes

Keywords

  • Nitrophenol
  • Photocatalysis
  • Surface-modified titanium dioxide

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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