Ag掺杂型空心TiO2纳米微球的制备与表征及其光催化性能

doi:10.3866/PKU.WHXB201206262

Abstract

Abstract:

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 n_Ag/n_Ti 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 n_Ag/n_Ti of 1.0% and 2.0%.

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

JI Ping-Li, WANG Jin-Gang, ZHU Xiao-Li, KONG Xiang-Zheng. Preparation of Silver Doped TiO₂ Hollow Nanoparticles and Characterization of Their Structures and Photocatalytic Properties[J]. Acta Phys. -Chim. Sin. 2012, 28(09), 2155-2161. doi: 10.3866/PKU.WHXB201206262

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

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