TiO2 activation using acid-treated vermiculite as a support: Characteristics and photoreactivity
TiO2 activation using acid-treated vermiculite as a support: Characteristics and photoreactivity
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使用酸处理蛭石作为载体的 TiO2 活化：特性和光反应性
DOI：
10.1016/j.apsusc.2011.11.017
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发表时间：
2012-02-01
影响因子：
6.7
通讯作者：
Dai, Bin
中科院分区：
文献类型：
--
作者：
Jin, Ling;Dai, Bin
用不同浓度的硫酸和硝酸水溶液处理蛭石。这些改性材料作为有前途的载体，被用于固定TiO2。该前驱体用Cl-in氯化钛{[Ti(IV)(OR)(n)Cl-m] (n = 2-3, m = 4 - n)}取代部分异丙醇得到TiO2。采用x射线衍射、扫描电镜、氮吸收等方法对TiO2/蛭石复合材料进行了表征。通过对亚甲基蓝（MB）的去除，评价了它们的光催化活性。纯锐钛矿型晶相沉积良好。处理酸的浓度对蛭石的孔径和表面积有显著影响。该处理工艺改变了蛭石的微观结构，修饰了其特性，进一步提高了TiO2/蛭石复合材料的催化活性和吸附能力。硝酸的处理效果优于硫酸。(C) 2011 Elsevier B.V.版权所有
Vermiculite was treated by sulfuric or nitric acid aqueous solutions with different concentration. These modified materials as the promising supports, were used to immobilize TiO2. TiO2 was prepared by the precursor, which was obtained by substituting partly isopropyl alcohol with Cl-in titanium chloride {[Ti(IV)(OR)(n)Cl-m] (n = 2-3, m = 4 - n)}. The TiO2/vermiculite composites were characterized by X-ray diffraction, scanning electron microscopy, and the nitrogen absorption. Their photocatalytic activity was evaluated by removal of methylene blue (MB). The pure anatase type crystalline phase was well deposited on the supports. The concentrations of acid for treatment had a significant influence on pore sizes and surface area of vermiculite. The treatment process changed microstructure of vermiculite, modified its characteristics, and farther improved the catalytic activity and absorption capacity of TiO2/vermiculite composites. The treatment effect of nitric acid was superior to that of sulfuric acid. (C) 2011 Elsevier B.V. All rights reserved.