Formation of highly crystallized TiO2(B) and its photocatalytic behavior

被引:65
作者
Chakraborty, Ashok Kumar [1 ]
Qi, Zhang [1 ]
Chai, Seung Yong [1 ]
Lee, Chongmu [2 ]
Park, Sun-Young [3 ]
Jang, Du-Jeon [3 ]
Lee, Wan In [1 ]
机构
[1] Inha Univ, Dept Chem, Inchon 402751, South Korea
[2] Inha Univ, Dept Mat Sci & Engn, Inchon 402751, South Korea
[3] Seoul Natl Univ, Sch Chem, Seoul 151742, South Korea
基金
新加坡国家研究基金会;
关键词
TiO2(B); Crystallinity; Thermal stability; Photocatalyst; Photocatalysis; Decomposition; 4-Chlorophenol; Kinetic parameter; TITANIUM-DIOXIDE; ANATASE TIO2; AQUEOUS PROPAN-2-OL; LAYERED TITANATES; MESOPOROUS TIO2-B; REDOX REACTIONS; NANOPARTICLES; WATER; DEGRADATION; NANOFIBERS;
D O I
10.1016/j.apcatb.2009.10.010
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Highly crystallized TiO2(B) in a flat-whiskered morphology, with a width of similar to 300 nm, thickness of 50-100 nm, and length of several microns, was successfully synthesized by three-step reactions employing Degussa P25 and CsCO3 as starting materials. The synthesized TiO2(B) with a crystallite size of 30.2 nm demonstrated an extended thermal stability up to 650 degrees C and an unexpectedly high photocatalytic activity in decomposing 4-chlorophenot (4-CP), and several other organic compounds in aqueous solution. The photocatalytic activity of TiO2(B) heat-treated at 600 degrees C was 1.26-1.43 and 1.95-2.32 times, respectively, compared to that of Degussa P25 and 25 nm-sized anatase nanoparticle. Kinetic parameters in decomposing dilute 4-CP were also determined by applying the Langmuir-Hinshelwood p equation. The equilibrium binding constant (K) of the prepared TiO2(B) was 1.6 times that of Degussa P25, even though its surface area was less than a third, whereas the reaction rate constants (k) were similar. Exceptionally high K is attributable to the unique crystallographic structure of TiO2(B) constructed by stacking of the negatively charged titania blocks, which enhances the adsorption affinity toward organic compounds. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:368 / 375
页数:8
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