Preparation of Porous Pt/TiO_2-SiO_2 Photocatalyst and its Performance in Photocatalytic Degradation of Pyrene

摘要

Photocatalytic degradation of pyrene, a 4-ring polycyclic aromatic hydrocarbon (PAH) that wildly distribute in water environment, was studied in photocatalyst suspension with monochromatic (368nm) UV irradiation. The preparation of photocatalyst used in our study, porous Pt/TiO_2-SiO_2 photocatalyst (PPtPC), was presented. The study included characterizing PPtPC by the scanning electron microscopy (SEM), comparing with commercially available TiO_2 (ST-01) and investegating the effects of different operating parameters. The results indicated that the mean diameter of surface particle of PPtPC was 74 nm, and the calculated surface area was 2.1 m~2g~(-1). PPtPC presented a faster degradation rate and higher adsorption of pyrene than ST-01. PPtPC could also work well on decomposing pyrene in high concentration of 100μg L~(-1). The photocatalytic degradation was favored with low pH, and higher temperature over or equal to 20 degree C. Effect of air purging and nitrogen purging on the efficiency of degradation was also examined.