Photocatalysts prepared from layered clays and titanium hydrate for degradation of organic pollutants in water
Photocatalysts prepared from layered clays and titanium hydrate for degradation of organic pollutants in water
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DOI：
10.1016/j.clay.2004.05.001
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发表时间：
2005
影响因子：
5.6
通讯作者：
Huaiyong Zhu;Jie Li;Jincai Zhao;G. Churchman
中科院分区：
文献类型：
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作者：
Huaiyong Zhu;Jie Li;Jincai Zhao;G. Churchman
利用强酸性钛氢氧化物溶胶与四种蒙皂石粘土反应，制备了二氧化钛（TiO 2）和硅酸盐纳米颗粒的复合纳米结构。酸性溶胶溶液与粘土片晶反应并浸出粘土中的部分镁或铝，而溶胶颗粒进一步水解，产生较大的TiO 2纳米颗粒前体并在浸出的硅酸盐的碎片上凝聚。此外，在合成中引入PEO表面活性剂可以显著增加复合固体的孔隙率和表面积。产品中的TiO 2为几个纳米大小的晶粒。它们分散在硅酸盐板上或被硅酸盐碎片和空隙分开，使得它们可接近有机分子。其合成反应机理与传统的柱撑法有很大的不同。该复合固体为水溶液中苯酚和合成染料的降解提供了高效的光催化剂。
Reaction between titanium hydrate sol of strong acidity and four smectite clays were utilized to create composite nanostructures of titanium dioxide (TiO2) and silicate nanoparticles. The acidic sol solution reacts with the clay platelets and leaches out part of the magnesium or aluminum in the clay, while the sol particles hydrolyze further, yielding larger precursors of TiO2nanoparticles and condense on the fragmentised pieces of the leached silicate. Moreover, introducing PEO surfactants into the synthesis can significantly increase the porosity and surface area of the composite solids. The TiO2in the product are crystal grains of several nanometres in size. They disperse on silicate plates or are separated by silicate fragments and voids such that they are accessible to organic molecules. The mechanism of the synthesis reaction is distinguishingly different from conventional pillaring process. The composite solids provide highly effective photocatalysts for the degradation of phenol and synthetic dyes in aqueous solution.