Effects of Fe3+ and Ag+ ions on the photocatalytic degradation of sucrose in water
2001; Elsevier BV; Volume: 68; Issue: 1-3 Linguagem: Inglês
10.1016/s0920-5861(01)00301-7
ISSN1873-4308
AutoresVeronica Vamathevan, Helen Tse, Rose Amal, Gary Low, Stephen R. McEvoy,
Tópico(s)Advanced Nanomaterials in Catalysis
ResumoThe photocatalytic oxidation of sucrose in the presence of dissolved Fe3+ and Ag+ ions in titanium dioxide suspensions under near-UV illumination has been investigated. The oxidation of sucrose to carbon dioxide was enhanced in the presence of these metal ions at low atom:atom percentage concentrations. An optimum metal ion loading was observed for both silver (2.0 atom%) and iron (1.0 atom%) ions. Beyond the optimum metal loading, the activity of silver-modified TiO2 particles was lowered. In the case of iron-modified TiO2, the activity of the catalyst (5.0 atom% Fe3+) was lower than that of bare TiO2. The role of metal ions in photocatalytic reactions is a function of the type of the metal and its concentration in the system. Different mechanisms are responsible for the effects of different metal ions added to titanium dioxide suspensions.
Referência(s)