Preparation and Photocatalytic Activity of Pb²⁺- SiO₂-TiO₂ Composite Catalyst

Abstract

Pb 2+ -SiO 2 -TiO 2 (Hereinafter referred to as PST) composite catalysts were prepared by sol-gel method from tetrabutyl titanate(TBOT),tetraetethyl orthosilicate(TEOS) and lead nitrate. Properties of the catalyst were characterized by means of XRD and FT-IR. In addition, the photocatalytic activities of Pb 2+ doped silicon-titanium composite samples were evaluated by the result of photocatalytic degradation of methyl orange as a model reaction under simulated sunlight.The results have been showed that the optimum Pb 2+ doping concentration is 1.5% and the optimum heat treatment temperature is 500°C. Photocatalytic degradation conversion of methyl orange (10 mg/L) on PST catalyst could reach above 90.0% under simulated sunlight for 3h.