We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Investigation of Photocatalytic Activity of Nan...
View graph of relations

« Back

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

Research output: Contribution to journalJournal article


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


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