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Investigation of Photocatalytic Activity of Nano-Sized TiO2 with the Presence of Various Inorganic Anions.

Research output: Contribution to journalJournal article

Published

  • Yun Zhang
  • Xiaobo Ji
  • Hong Li
  • Jianying Chen
  • Yuan Wang
Journal publication date06/2009
JournalJournal of Nanoscience and Nanotechnology
Journal number6
Volume9
Number of pages5
Pages3639-3643
Original languageEnglish

Abstract

The effect of various anions on the photocatalytic activity of nano-sized TiO2 was investigated in a methyl orange solution. The photocatalytic activity of the TiO2 nanoparticles was significantly affected in the presence of SO2−4, CO2−3, NO−3 and Cl−. Among the tested ions, Cl− was most effective anion in changing the photocatalytic activity. Addition of Cl− (0.05 M) decreased the methyl orange photodegradation rate to only one quarter of that when TiO2 was used alone. It was also demonstrated that the effects of these inions, on the rate of photocatalytic activity of the nanoparticles, were concentration dependent. There was a negative correlation between the concentrations of NO−3 and Cl− and the methyl orange degradation rate by TiO2. However, at low concentrations, CO2−3 and SO2−4 enhanced the photocatalytic activity; while at the higher concentrations, these two anions inhibited the photocatalytic activity of TiO2