A simple template-free approach to TiO2 hollow spheres with enhanced photocatalytic activity

被引：201

作者：

Yu, Jiaguo ^{[1
]}

Zhang, Jun ^{[1
]}

机构：

[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China

来源：

DALTON TRANSACTIONS | 2010年 / 39卷 / 25期

基金：

中国国家自然科学基金;

关键词：

INDUCED SELF-TRANSFORMATION; HYDROTHERMAL SYNTHESIS; THIN-FILMS; MESOPOROUS TIO2; SURFACE FLUORINATION; AQUEOUS SUSPENSION; SPRAY-PYROLYSIS; SILICA SPHERES; MICROSPHERES; TITANIA;

D O I：

10.1039/c0dt00053a

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Mesporous anatase-phase TiO2 hollow spheres with high photocatalytic activity were prepared by hydrothermal treatment and self-transformation of amorphous TiO2 solid spheres in an NH4F aqueous solution. The prepared samples were characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, N-2 adsorption-desorption isotherms and UV-vis absorption spectroscopy. The photocatalytic activity was evaluated by photocatalytic oxidation decomposition of acetone in air under UV irradiation. It is found that F-plays an essential role in the formation of TiO2 hollow spheres. F-not only induces the hollowing of TiO2 solid spheres, but also promotes the crystallization of anatase TiO2 nanocrystals. A possible formation mechanism for the TiO2 hollow spheres by localized Ostwald ripening or chemically induced self-transformation is proposed based on the experimental observations. Furthermore, the molar ratios of NH4F to TiO2 (R) exhibit a significant influence on the morphology and photocatalytic activity of the TiO2 samples. The photocatalytic activity of the samples prepared in the presence of NH4F is higher than that of TiO2 sample prepared in pure water and commercial Degussa P25 (P25) powders. Especially, the TiO2 hollow spheres prepared at R = 1 show the highest photocatalytic activity and the specific rate constant S-k exceeds that of P25 by a factor of more than two.

引用

页码：5860 / 5867

页数：8

共 72 条

[11] Facile synthesis of hollow silica microspheres [J].

Fowler, CE ;

Khushalani, D ;

Mann, S .

JOURNAL OF MATERIALS CHEMISTRY, 2001, 11 (08) :1968-1971

[12] ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE [J].

FUJISHIMA, A ;

HONDA, K .

NATURE, 1972, 238 (5358) :37-+

[13] Magnetic-dipolar-interaction-induced self-assembly affords wires of hollow nanocrystals of cobalt selenide [J].

Gao, JH ;

Zhang, B ;

Zhang, XX ;

Xu, B .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2006, 45 (08) :1220-1223

[14] One-Pot Synthesis of Uniform Cu2O and CuS Hollow Spheres and Their Optical Limiting Properties [J].

Gao, Jining ;

Li, Quanshui ;

Zhao, Huabo ;

Li, Lianshan ;

Liu, Chunling ;

Gong, Qihuang ;

Qi, Limin .

CHEMISTRY OF MATERIALS, 2008, 20 (19) :6263-6269

[15] Simple preparation of monodisperse hollow silica particles without using templates [J].

Hah, HJ ;

Kim, JS ;

Jeon, BJ ;

Koo, SM ;

Lee, YE .

CHEMICAL COMMUNICATIONS, 2003, (14) :1712-1713

[16] ENVIRONMENTAL APPLICATIONS OF SEMICONDUCTOR PHOTOCATALYSIS [J].

HOFFMANN, MR ;

MARTIN, ST ;

CHOI, WY ;

BAHNEMANN, DW .

CHEMICAL REVIEWS, 1995, 95 (01) :69-96

[17] Synthesis of novel nickel sulfide submicrometer hollow spheres [J].

Hu, Y ;

Chen, JF ;

Chen, WM ;

Lin, XH ;

Li, XL .

ADVANCED MATERIALS, 2003, 15 (09) :726-729

[18] A self-templated approach to TiO2 microcapsules [J].

Hu, Yongxing ;

Ge, Jianping ;

Sun, Yugang ;

Zhang, Tierui ;

Yin, Yadong .

NANO LETTERS, 2007, 7 (06) :1832-1836

[19] Hollow titania spheres with movable silica spheres inside [J].

Kai, Z ;

Zhang, XH ;

Chen, HT ;

Xin, C ;

Zheng, LL ;

Zhang, JH ;

Bai, Y .

LANGMUIR, 2004, 20 (26) :11312-11314

[20] Visible-light-induced photocatalytic degradation of 4-chlorophenol and phenolic compounds in aqueous suspension of pure titania: Demonstrating the existence of a surface-complex-mediated path [J].

Kim, S ;

Choi, W .

JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (11) :5143-5149

← 1 2 3 4 5 6 7 8 →