Synthesis of bicrystalline TiO2 supported sepiolite fibers and their photocatalytic activity for degradation of gaseous formaldehyde

被引：81
作者：
Zhang, Gaoke [1 ]
Xiong, Qiao [1 ,2 ]
Xu, Wei [2 ]
Guo, Sheng [1 ]
机构：
[1] Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Peoples R China
[2] Wuhan Second Ship Design & Res Inst, Wuhan 430064, Peoples R China
来源：
APPLIED CLAY SCIENCE | 2014年 / 102卷
关键词：
TiO2; Sepiolite fibers; Anatase; Rutile; Photocatalytic; Formaldehyde; SELECTIVE OXIDATION; CATALYTIC BEHAVIOR; ACID; ADSORPTION; TEMPERATURE; VARIABILITY; HYDROLYSIS; REMOVAL; PHENOL; PHASE;
D O I：
10.1016/j.clay.2014.10.001
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：
Bicrystalline TiO2 supported acid activated sepiolite (TiO2/AAS) fibers have been successfully synthesized by a simple method at low temperature. The as-prepared TiO2/AAS composites were characterized by X-ray diffraction (XRD), nitrogen adsorption/desorption method, UV-vis diffuse reflectance spectrum (UV vis DRS), scanning electron microscope (SEM), high-resolution transmission electron microscopy (HRTEM) and Fourier transform infrared (FT-IR) spectroscopy. The X-ray diffraction analysis indicates that the binary mixtures of anatase and rutile exist in the TiO2/AAS composites. The specific surface area of the TiO2/AAS composites is much larger than that of raw sepiolite and acid activated sepiolite (AAS) fibers. The photocatalytic activities of the TiO2/AAS composites were evaluated by the degradation of gaseous formaldehyde (a main indoor air pollutant) under UV light irradiation. The result indicates that the photocatalytic activity of the TiO2/AAS composites is excellent and superior to that of the TiO2/sepiolite (raw sepiolite) and pure TiO2. The high photocatalytic activity of the TiO2/AAS composites can be attributed to the anatase rutile mixed phase and bimodal pore structure in the TiO2/AAS composites. (C) 2014 Elsevier B.V. All rights reserved.
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页码：231 / 237
页数：7
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