| 超临界干燥法制备TiO2/凹凸棒复合光催化剂 |
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| 引用本文： | 甄文媛,李青. 超临界干燥法制备TiO2/凹凸棒复合光催化剂[J]. 化工学报, 2018, 69(5): 2290-2298. DOI: 10.11949/j.issn.0438-1157.20171153 |
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| 作者姓名： | 甄文媛 李青 |
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| 作者单位： | 北京服装学院材料科学与工程学院, 北京 100029 |
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| 基金项目： | 北京服装学院研究生创新项目（X2017-075）。 |
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| 摘 要： | 以凹凸棒为载体，四氯化钛为钛源，通过溶胶-凝胶法结合超临界干燥法制备TiO2/凹凸棒复合光催化材料。采用XRD、SEM、TEM、BET、XPS等方法对材料的结构、形貌及催化性能进行表征。研究结果表明：超临界干燥可增大复合材料的比表面积，抑制TiO2发生晶型转变。凹凸棒吸附特性良好，增加了材料表面的活性位点，显著提高催化剂的光催化活性。不同煅烧温度下的TiO2均为锐钛矿型，粒径约为20 nm，呈不规则短棒状，成功负载于凹凸棒上。在400℃煅烧2 h条件下，催化剂3 h后对亚甲基蓝的降解率可达98.4%。
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| 关 键 词： | 凹凸棒 TiO2 超临界干燥 催化 纳米材料 废水 |
| 收稿时间： | 2017-08-22 |
| 修稿时间： | 2017-10-13 |
Preparation of TiO2/attapulgite composite photocatalyst by supercritical fluid drying method |
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| ZHEN Wenyuan,LI Qing. Preparation of TiO2/attapulgite composite photocatalyst by supercritical fluid drying method[J]. Journal of Chemical Industry and Engineering(China), 2018, 69(5): 2290-2298. DOI: 10.11949/j.issn.0438-1157.20171153 |
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| Authors: | ZHEN Wenyuan LI Qing |
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| Affiliation: | School of Material Science and Engineering, Beijing Institute of Fashion Technology, Beijing 100029, China |
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| Abstract: | TiO2/attapulgite nanocomposites were synthesized by the sol-gel method and supercritical fluid drying (SCFD) method using attapulgite as support and the aqueous solution of TiCl4 as raw material. The composition, morphological properties and catalytic performance of catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy(XPS), and nitrogen adsorption-desorption measurements. The results show that there are no phase transformation from anatase to rutile about samples, the specific surface area of materials was increased. The adsorption property of attapulgite is excellent, the quantity of active adsorption sites on the surface of the materials were increased. TiO2 calcined at different temperatures are all anatase, they have smaller particle size and short clavite structure. The photoactivity of the samples under UV light was evaluated by photocatalytic degradation of methylene blue in aqueous solution. The maximum photodegradation rate was obtained in the samples calcined at 400℃, it can reach 98.4% under the irradiation of ultraviolet light for 3 h. |
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| Keywords: | attapulgite TiO2 SCFD catalysis nanomaterials waste water |
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