Preparation of fine particulate composites having magnetism as photocatalytic materials for waste water treating

具有磁性的细颗粒复合材料作为废水处理光催化材料的制备

基本信息

批准号：
10650676
负责人：
KIMURA Isao
金额：
$ 1.34万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

1 Preparation of silica-based composites covered with titaniaTTIP-hexane solution was poured into the reaction system, in which silica particles were prepared by suspending acetic acid aqueous solution in TEOS-hexane solution. Three methods for adding TTIP solution was attempted : (method 1) all the solution was added at a time of 24 or 36 h ; (method 2) the solution was divided into two parts, and each half was added at times of 24 and 36 h ; (method 3) the solution was divided into four parts, and each quarter was added at times of 24, 28, 32, and 36 h. Results obtained were summarized as follows.(1) Titania content increased with increasing TTIP concentration. Addition methods did not affect it.(2) By method 1, titania agglomerates of 10 μm in diameter adhered onto the surface of the composites.(3) The agglomerates decreased by the dividing addition. By method 3, covering was uniform.(4) The effects of calcining temperature on the specific surface area or the crystalline phase were discussed.2 Photocatalytic degradation of an organic compound in waste water with compositesPhotocatalytic degradation of dye solution was examined. Results obtained were summarized as follows.(1) With using the composite calcined at 1073 K, the concentration decreased without UV irradiation. It decreased moreover with radiation.(2) The degradation was more notably with using the composite calcined at 773 K.(3) Overall degradation with the composites was much larger than titania ultrafine particles, owing to the effect of adsorption in addition to photocatalytic activity.(4) Dye adsorbed was eliminated by firing, and the composites could be reused for waste water treating.(5) It was very easy to separate the photocatalysis from water treated.

1 二氧化钛包覆二氧化硅基复合材料的制备将TTIP-己烷溶液倒入反应体系中，其中通过将乙酸水溶液悬浮在TEOS-己烷溶液中制备二氧化硅颗粒，尝试了三种添加TTIP溶液的方法：（方法1）。 ) 24或36小时时全部加入；(方法2)将溶液分成两部分，各半次加入； 24和36小时；(方法3)将溶液分成四份，每季度在24、28、32和36小时的时间添加。所得结果总结如下：(1)二氧化钛含量随时间增加而增加。增加TTIP浓度对其没有影响。(2)通过方法1，直径为10μm的二氧化钛团聚体粘附在复合材料的表面。(3)方法3中，团聚体减少，覆盖均匀。(4)讨论了焙烧温度对比表面积或晶相的影响。2复合材料光催化降解废水中的有机物光催化降解染料。所得结果总结如下：(1)使用在1073K下煅烧的复合材料，在没有UV照射的情况下浓度降低，而且随着辐射的降低。使用在 773 K 下煅烧的复合材料时效果更为显着。(3) 由于除光催化活性之外的吸附作用，复合材料的总体降解远大于二氧化钛超细颗粒。(4) 吸附的染料通过烧制消除， (5)光催化材料可以很容易地从处理后的水中分离出来。