Preparation of TiO2-Coated Hollow Glass Microspheres from Titania-Hydrate-Coated Fine Volcanic Glass
Preparation of TiO2-Coated Hollow Glass Microspheres from Titania-Hydrate-Coated Fine Volcanic Glass
复制标题
用二氧化钛水合物包覆的细火山玻璃制备TiO2包覆的空心玻璃微球
DOI：
10.2109/jcersj.107.775
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
K. Kimura
中科院分区：
文献类型：
--
作者：
D. Shin;K. Kimura
以二氧化钛水合物包覆的火山玻璃（FVG）微粒为原料，在940°C下热处理几秒钟，制备了用于轻质耐火材料的TiO 2包覆空心玻璃微球（HGMS）。通过将沉淀剂滴加到其中溶解有涂层原料的悬浮液中，用二氧化钛水合物涂覆FVG颗粒。由于沉淀剂的分解和搅拌速度，悬浮液的pH值的变化对表面层的性质和晶体结构有显著的影响。在0.6ml/min的沉淀剂添加速率和1000 rpm的搅拌速度下，实现了FVG颗粒的平滑覆盖，并且晶体结构是无定形的并且具有痕量的无定形相。在0.1 ml/min和300 rpm下，在FVG颗粒上形成厚而粗糙的层;其结构是无定形的，并且具有痕量的金红石相。随着热处理温度的升高，TiO 2和金红石晶体数量增多，最终TiO 2完全覆盖HGMS表面。由二氧化钛水合物包覆的FVG得到的TiO 2包覆的HGMS具有低密度和高强度的优点，并且可以用作光催化填料。
TiO 2 -coated hollow glass microspheres (HGMSs) for use in lightweight photocatalysis were developed from titania-hydrate-coated fine volcanic glass (FVG) particles by heat treatment at 940°C for a few seconds. FVG particles were coated with titania hydrate by adding a precipitant dropwise into a suspension in which a raw material of coating layer was dissolved. The change in pH of the suspension, due to decomposition of precipitant, and the stirring speed, had a pronounced effect on the nature of the surface layer and the crystal structure. At an addition rate of 0.6 ml/min of precipitant and a stirring speed of 1000 rpm, smooth coverage of the FVG particles was achieved, and the crystal structure was amorphous and had traces of the anatase phase. At 0.1 ml/min and 300 rpm, a thick and rough layer developed on the FVG particles; its structure was amorphous and had traces of the rutile phase. The crystals of anatase and rutile increased in number with heat treatment temperature and finally the surface of HGMS was entirely covered by TiO 2 . TiO 2 -coated HGMSs from the titania-hydrate-coated FVG are advantageous in particles with low density and high strength, and can be used as photocatalytic fillers.