TiO_2/ACFs催化剂光催化降解染料废水活性研究

以活性炭纤维为载体,采用溶胶-凝胶法制备得到了活性炭纤维负载二氧化钛光催化剂(TiO2/ACFs),并且以亚甲基蓝为模型化合物模拟研究了活性炭纤维负载二氧化钛光催化剂(TiO2/ACFs)对染料废水的光催化活性。通过扫描电镜(SEM)、XRD等表征方法对活性炭纤维负载二氧化钛光催化剂(TiO2/ACFs)的结构进行了研究。SEM表征显示,大部分二氧化钛以膜的形式均匀地包裹在活性炭纤维丝上,二氧化钛膜层的厚度大约为330 nm,还有一部分TiO2是以颗粒的形式负载在活性炭纤维上。FT-IR分析可知,ACF与TiO2之间有Ti—O—C键生成,说明TiO2与ACF结合牢固,TiO2不易脱落。通过对亚甲基蓝降解可知当煅烧温度为500℃时,TiO2/ACF的光催化性能最好,通过对比发现500℃煅烧制备的催化剂也具有最好的循环使用性能,经过4次循环后该催化剂对亚甲基蓝的去除率仍达到90.2%。

Photo-catalytic Activity of TiO2-loaded Activated Carbon Fiber for Degradation of Textile Dye

TiO2-loaded activated carbon fiber was prepared as a new kind of photo-catalyst by sol-gel method plus calcination in nitrogen atmosphere,and used to treat simulated wastewater containing a textile dye(methylene blue).To probe the details of AFC’s surface coated with TiO2 and its photo-catalystic activity in degradation of methylene blue,instruments such as SEM,XRD and FT-IR were used.It has been proved that when preparing TiO2-loaded AFC calcination at 500 ℃ is the optimum condition to obtain the best photo-catalytic activity and the satisfactory property for reuse of the catalyst,i.e.,the dye-removing rate could remain 90.2% even when being used four times.