Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (09): 2155-2161.doi: 10.3866/PKU.WHXB201206262

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation of Silver Doped TiO2 Hollow Nanoparticles and Characterization of Their Structures and Photocatalytic Properties

JI Ping-Li, WANG Jin-Gang, ZHU Xiao-Li, KONG Xiang-Zheng   

  1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
  • Received:2012-04-05 Revised:2012-06-25 Published:2012-08-02
  • Contact: WANG Jin-Gang, KONG Xiang-Zheng;
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20874040, 20904016) and Technology Project for High Education Institutions in Shandong Province, China (J10LB09).


Anionic polystyrene (PSt) latex particles were synthesized by emulsion polymerization of methacrylic acid and styrene (St). The anionic PSt particles were surface treated with vinyl trimethoxysilane in a mixture of ethanol and water. PSt/TiO2 composite particles doped with Ag2O were then prepared through hydrolysis of tetrabutyl titanate and AgNO3 using the surface treated PSt particles as templates. Hollow Ag-TiO2 particles were successfully prepared by treating the PSt/TiO2 composite microspheres at 180 °C, after which they were dried and calcined at 500 °C. The morphology of the PSt/TiO2 particles and crystal structure of the Ag-TiO2 hollow particles were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). Photocatalytic activity of the Ag-TiO2 hollow particles for Rhodamine B (RhB) degradation was tested under ultraviolet (UV, 365 nm) and UV-visible (370-760 nm) light. Under UV light, RhB degradation was increased by about 11% when Ag-TiO2 particles with molar ratio nAg/nTi of 0.1% were used compared with pure TiO2 hollow particles. Under UV-visible light, RhB degradation was increased by about 30% for Ag-TiO2 composite particles with nAg/nTi of 1.0% and 2.0%.

Key words: Polystyrene nanoparticle template, Surface modification, Ag-TiO2 hollow particle, Photocatalytic property, Rhodamine B photodegradation