The effect of platinum and silver deposits in the photocatalytic oxidation of resorcinol

• Published in: Applied catalysis. B, Environmental Vol. 72; no. 3-4; pp. 363 - 372
• Main Authors: Lam, Sai Wei, Chiang, Ken, Lim, Tuti M., Amal, Rose, Low, Gary K-C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 30.03.2007; Elsevier
• Subjects: Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Indexing in process; Photocatalysis; Photochemistry; Photodeposition; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Platinum; Q1; Resorcinol; Silver; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Silver; Photodeposition; Platinum; Photocatalysis; Resorcinol; Heterogeneous catalysis; Transition metal; Oxidation; Environmental protection
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2006.11.019

The effects of platinum (Pt) and silver (Ag) metallisation in the photocatalytic oxidation of resorcinol at pH 3±0.5 have been investigated. The photocatalytic degradation of resorcinol was significantly improved by Pt/TiO2, while the presence of Ag/TiO2 enhanced the initial photocatalytic degradation rate of resorcinol slightly. Likewise, the photocatalytic mineralisation of resorcinol continued to be enhanced by Pt/TiO2, but it was retarded when Ag/TiO2 was used. The function of Pt and Ag deposits on the surface of TiO2 has been found to be markedly influenced by the interaction of resorcinol and its degradation products with the metal deposits. The presence of Pt or Ag on the surface of TiO2 altered the distribution of degradation products of resorcinol as well as the production of photoactive species for the photocatalytic oxidation of resorcinol. The X-ray photoelectron spectroscopy (XPS), zeta potential and transmission electron microscopy (TEM) analyses have indicated that the contrasting effect of Pt and Ag deposits were governed by the oxidation states and the catalytic property of metal deposits. In addition to that, it has been found that the roles of metal deposits are specific and should not be generalised.