TiO_2/Fe_2O_3/CNTs磁性光催化剂的制备及可见光下降解盐酸四环素  

Preparation and Characterization of TiO_2/Fe_2O_3/CNTs Magnetic Photocatalyst and Degradation of Tetracycline Hydrochloride in Visible Light

作　　者：卢昶雨[1] 关卫省[1] 赵英杰[1] 周娅[2] 

机构地区：[1]长安大学环境科学与工程学院,西安710054 [2]中铁二院西安勘察设计研究院有限责任公司,西安710054

出　　处：《科学技术与工程》2015年第20期146-151,共6页Science Technology and Engineering

基　　金：高等学校博士学科点专项科研基金项目(20110205110014);长安大学博士生助研科技项目(2014G5290009);国家大学生创新创业训练计划项目(201310710055)资助

摘　　要：以碳纳米管为载体支架,利用简便的化学沉积和热处理方法,将Fe2O3纳米颗粒负载在碳纳米管表面,得到磁性碳纳米管(Fe2O3/CNTs)。再利用溶胶-凝胶法包覆Ti O2纳米颗粒,制得一种新型的磁性光催化剂(Ti O2/Fe2O3/CNTs),通过SEM、TEM、XRD、VSM和UV-Vis等方法,对样品进行了一系列的表征。将其用于水体中盐酸四环素的降解,探究了p H条件、原始浓度以及光催化剂用量对降解作用的影响。结果表明,样品具有紧凑的交错多孔结构,Ti O2/Fe2O3纳米颗粒包覆在其表面。样品能对紫外-可见光产生较强吸收,光能利用率及光催化性能显著提高。在25 mg/L盐酸四环素偏酸性体系中,在1.5 mg/L催化剂用量下,光催化反应降解率可达95.1%,光催化反应符合一级反应动力学模型。此外,催化剂还具备良好的超顺磁性,易于分离回收,重复使用,有望成为一种经济,环保,高效,可循环的四环素降解材料。A kind of material which own both magnetic and photocatalytic performance was intend to prepare. Carbon nanotubes as the carrier bracket, magnetic carbon nanotubes （Fe2O3/CNTs） was prepared at first that Fe2 03 nanoparticles were supported on the surface by the simple mean of chemical deposition and heat treatment. Then, coated with TiO2 nanoparticles by sol-gel method, a new-style magnetic photocatalyst （TiO2/Fe2O3/CNTs） was obtained. The samples were characterized by Scan Electronic microscope techniques （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, vibrating sample magnetometer （VSM） and UV-Vis spec- troscopy. Besides, influence factors of tetracycline hydrochloride degradation like pH conditions, usage amounts and the initial concentrations of the catalyst were explored, the model of the reaction kinetics was simulated as well. The results show that TiO2/Fe203 nanoparticles were coated on the surface of magnetic photocatalyst, with compact staggered porous structure. Sample can make a high absorption to ultraviolet-visible, light energy utilization and photocatalytic property have been enhanced dramatically. The photocatalytic reaction followed the first-order kinet- ics. In neutral or acidulous solution with 25 mg/L of tetracycline hydrochloride, the degradation rate can reach to 95.1%. In the effect of external magnetic field, the catalyst can be easily separated and recycled which still re- mains a striking photocatalytic performance. Thus, it could be expected to become an economical and efficient, environmentally friendly and recyclable material in tetracycline degradation.

关 键 词：盐酸四环素 磁性碳纳米管 二氧化钛 光催化 

分 类 号：X13[环境科学与工程—环境科学]