Study on the Photocatalytic Degradation of Wastewater under the Optimal Preparation of the Activated Carbon Supported TiO2 Thin Film
Study on the Photocatalytic Degradation of Wastewater under the Optimal Preparation of the Activated Carbon Supported TiO2 Thin Film
复制标题
活性炭负载TiO2薄膜优化制备下光催化降解废水的研究
DOI：
10.4028/www.scientific.net/amr.356-360.313
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
C. Chang
中科院分区：
文献类型：
--
作者：
K. Yao;J. Hsu;C. Chang
纺织工业通常排放含有各种染料的有色废水。这些染料通常含有一个以上的芳香结构，它们不仅难以被生物降解，而且有毒。UV/半导体法具有光稳定性好、无毒、价格低廉、不溶于水等优点，已被研究和应用。本研究的目的是开发具有更高去除效率的光催化反应器。采用溶胶-凝胶法制备了TiO 2薄膜，并将其包覆在活性炭表面，以增加反应机会，提高污染物的去除效率。采用田口法优化制备条件。结果表明，当钛酸四异丙酯、异丙醇和乙酸的摩尔比为1：2：8，煅烧温度为500°C，煅烧时间为90 min时，TiO 2的光催化活性最佳。通过SEM、ESCA和XRD对TiO 2薄膜进行了进一步分析，结果表明TiO 2的晶粒尺寸约为17 nm，晶体结构主要为立方晶系。当PAC在催化剂中的比例增加> 4%时，光催化反应速率提高15~20%。结果表明，复合催化剂体积增大，沉降量增大，易于回收。
Textile industries usually discharge colored effluents containing various dyes. These dyes usually contain more than one aromatic structure and they are not only difficult to be degraded biologically but also toxic. UV/semiconductor procedure, with advantages including photostability, non-toxicity, affordable price, and insolubility in water, has been studied and used. This aim of this study is to develop photocatalytic reactor with higher removal efficiency. The TiO2 thin film was prepared by Sol-Gel method and coated on the surface of activated carbon to enhance the reaction opportunity and increase pollutants removal efficiency. Taguchi method was used to optimize preparing conditions. The results indicated that the best TiO2 photocatalytic activity can be found when tetraisopropyl orthotitanate, isopropyl alcohol and acetic acid were mixed in the molar ratio of 1：2：8 under the calcination temperature of 500°C for 90 minutes. Further analysis of TiO2 thin film by SEM, ESCA and XRD, the results showed that grain size of TiO2 was about 17 nm and crystal structure mainly was anatase. The photocatalytic reaction rate increased 15~20% when the ratio of PAC in catalyst increased > 4%. The results suggested that recovery of the composited catalyst become easy because its volume and subsiding increased.