Preparation of Ag/AgCl-TiO2 Hollow Nanoparticles by Co-precipitation and Their Photocatalytic Property

doi:10.7503/cjcu20130219

Abstract

Abstract:

Anionic polystyrene(PSt) latex particles were prepared through emulsion polymerization of methacrylic acid and styrene(St). The PSt particles were surface-treated using vinyl trimethoxysilane in a mixed solvent of ethanol and water. PSt-AgCl-TiO₂ composite particles were then prepared through hydrolysis of tetrabutyl titanate and the reaction of AgNO₃ with NaCl using the surface treated PSt particles as templates. Ag/AgCl-TiO₂ hollow particles were obtained by pre-treating the PSt-AgCl-TiO₂ composite microspheres at 180 ℃ followed by drying and calcination at 500 ℃ for 4 h. XRD characterization of the final Ag/AgCl-TiO₂ particles reveals that anatase crystal structure in pure TiO₂ is unchanged with AgCl doping. EDS analysis shows that part of the added AgCl is transformed to Ag element, leading to the formation of the hollow Ag/AgCl doped TiO₂ composite particles. Surface area test indicates that average pore size in the Ag/AgCl-TiO₂ particles is about 12 nm with a specific surface varied from 125 m²/g to 190 m²/g, depending on the amount of AgCl. These specific surface values are much higher than that observed in commercial TiO₂, P25 for instance. Photocatalytic activity of the Ag/AgCl-TiO₂ hollow particles in degradation of Rhodamine B(RhB) was tested under UV and visible light. The results show that, compared with RhB degradation with pure TiO₂ hollow particles under UV light, RhB degradation at 30 min increases by about 13% when Ag/AgCl-TiO₂ particles with Ag content at n(Ag)/n(Ti)=0.1% is used as the catalyst; whereas an increase of about 38% is observed under visible light with Ag/AgCl-TiO₂ composite particles[n(Ag)/n(Ti)=2.0%] at 120 min of the photodegradation. In addition, the photocatalytic activity of the Ag/AgCl-TiO₂ particles under visible light is increasing with Ag amount up to n(Ag)/n(Ti)=2.0%, and this catalytic activity starts to decrease when Ag amount reaches n(Ag)/n(Ti)=4.0%. Nevertheless, all the Ag/AgCl-TiO₂ particles demonstrate a higher photocatalytic performance than P25, regardless of their AgCl content. The photocatalysis mechanism of the Ag/AgCl-TiO₂ particles was provided, and the results were interpreted based on the mechanism.

Key words: Polystyrene nanoparticles, Template, Surface modification, Ag/AgCl-TiO₂ hollow particle, Photocatalytic property, Rhodamine B degradation

CLC Number:

O643.3

TrendMD:

WANG Jin-Gang, JI Ping-Li, KONG Xiang-Zheng. Preparation of Ag/AgCl-TiO₂ Hollow Nanoparticles by Co-precipitation and Their Photocatalytic Property[J]. Chem. J. Chinese Universities, 2013, 34(11): 2635.

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Preparation of Ag/AgCl-TiO₂ Hollow Nanoparticles by Co-precipitation and Their Photocatalytic Property

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