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A TiO_2-suspended continuous photoreactor system combined with the separation of TiO_2 particles by coagulation for the photocatalytic degradation of dibutyl phthalate

TiO_2悬浮连续光反应器系统结合TiO_2颗粒混凝分离光催化降解邻苯二甲酸二丁酯

基本信息

批准号：
14580584
负责人：
HASEGAWA Kiyoshi
金额：
$ 2.3万
依托单位：
Toyama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Electrolyte-promoted easy separation of suspended TiO_2 particles with a solids retaining type centrifuge was developed by improving the coagulation method with basic aluminum chloride. The centrifuge was combined with a continuous flow photoreactor and the degradation of dibutyl phthalate(DBF) was examined.1.Coagulation of TiO_2 fine particles with electrolytesTiO_2 was added in an aqueous solution containing ImM electrolytes. The pH of the suspension was adjusted to 6.5(isoelectric point of TiO_2). The coagulation was increased in the order : Na_2SO_4〜__=CaCl_2>NaCl.2.Continuous centrifugation of Ti02 fine particles promoted by the addition of electrolytesThe relation between influent rate(residence time) of the suspension added the electrolytes and transmittance(T) of the discharge was examined. Under the setted conditions, T of the discharge was more than 98%.3.Continuous centrifugation of TiO_2 fine particles promoted by the electrolytes in well and tap waterGood separation was attained for well and tap water whose electrolytes amount are 50% of ImM Na_2SO_04.4.The presence of electrolytes and second reuse of recovered TiO_2 reduced the decomposition by 20%.5.Continuous flow operation was attained by connecting the photoreactor with the centrifuge.6.The combined system was successfully applied to the treatment of DBF spiked in well and tap water.

通过改进碱式氯化铝混凝方法，研制了固相截留式离心机，以电解质促进悬浮TiO_2颗粒的易分离。将离心机与连续流光反应器相结合,考察了邻苯二甲酸二丁酯(DBF)的降解情况。1.TiO_2细颗粒与电解质的凝聚将TiO_2加入到含有1mM电解质的水溶液中。将悬浮液的pH调节至6.5(TiO_2的等电点)。絮凝作用的增强顺序为：Na_2SO_4〜__=CaCl_2>NaCl。2.添加电解质促进TiO2细颗粒的连续离心添加电解质的悬浮液的进水速率（停留时间）与放电透过率（T）之间的关系。在设定条件下,放电T大于98%。3.井水和自来水中的电解质促进TiO_2细颗粒的连续离心。当电解质用量为50%的ImM Na_2SO_04时,井水和自来水得到了良好的分离。4.电解质的存在和回收的TiO_2的二次回用减少了20%的分解。5.实现了连续流操作将光反应器与离心机连接。6.组合系统成功应用于井水和自来水中添加的DBF的处理。