TiO2@PANI@纳米铁氧体光催化磁流体的制备及其光催化与磁回收性能研究

Nanometre TiO2 photocatalysis technique has a broad prospect in the field of waste water treatment.Magnetic titanium dioxide photocatalyst have both a excellent activity and a superior recovery rate.In the preparation process of the magnetic photocatalyst,the traditional heat treatment was found to reduce the magnetic recovery and the photocatalytic activity.The low-temperature method for the preparation of magnetic photocatalyst overcomed above shortcomings,but still could not improve the catalytic efficiency due to the poor dispersion of the magnetic photocalyst.In this project,we will prepare the TiO2@polyaniline(PANI)@nano ferrite photocatalytic magnetic fluid by in-situ growth method in the liquid system,which result this catalyst will exhibite both superior photocatalytic activity and good magnetic recovery performance,and the research in this field has not been reported previously.The PANI@nanoferrite magnetic fluid will be prepared via in-situ synthesis, and then the titanium dioxide will be loaded on them throung two optimal hydrothermal methods in liquid system.Then by changing the surface potential both the PANI@nanoferrite and the titanium dioxide to improve the combination between them.In the synthesis process of the catalysts, many large analytical and testing instruments will be used to characterize their physical and chemical properties，which will be helpful to optimize the preparation technology;Meanwhile,the photocatalytic activity and the megnetic recovery of the catalysts will be evaluated using several methods. Based on the plantation research in four years,the optimum synthesize technique of TiO2@polyaniline(PANI)@nano ferrite photocatalytic magnetic fluid will be established,which will be simple and low cost.The TiO2@PANI@nano ferrite photocatalytic magnetic fluid will has excellent photocatalytic activity and good magnetic recyclability, which will has good application foreground.

纳米TiO2具有广阔的应用前景。TiO2磁载光催化剂具有高催化效率及磁回收利用的优点。磁载光催化剂常规的热处理制备法存在着降低磁性和光催化活性的缺点，低温法克服了上述缺点，但仍不能解决催化剂分散性差而导致的催化效率降低的问题。本项目拟在液相原位制备TiO2@聚苯胺(PANI)@纳米铁氧体光催化磁流体，使高催化效率与磁回收性能兼得,目前尚未见相关报道。研究中将采用原位合成法制备PANI@纳米铁氧体磁流体，在液相体系下以两种最优水热合成法原位进行TiO2的负载，制备过程中，通过改变表面活性剂及体系溶剂类别来控制磁载体及催化剂的表面电位，促使TiO2牢固负载在PANI@纳米铁氧体表面。通过原位测定、理化性质表征以及磁性、光催化活性的考察，优化制备工艺，最终建立过程简洁、成本低廉的具有高光催化活性和良好磁回收性能的TiO2@PANI@纳米铁氧体光催化磁流体的制备方法，以利于TiO2的实际应用。

纳米TiO2具有广阔的应用前景。TiO2磁载光催化剂具有高催化效率及磁回收利用的优点。磁载光催化剂常规的热处理制备法存在着降低磁性和光催化活性的缺点，低温法克服了上述缺点，但仍不能解决催化剂分散性差而导致的催化效率降低的问题。本项目研究在液相原位制备TiO2@聚苯胺(PANI)@纳米铁氧、TiO2@三氧化二铝(Al2O3)@纳米铁氧体以及TiO2@二氧化硅(SiO2)@纳米铁氧体体光催化磁流体。研究中采用原位合成法制备了PANI@ @Fe3O4、Al2O3@Fe3O4以及SiO2@Fe3O4纳米铁氧体磁流体，在液相体系下以两种最优水热合成法原位进行了TiO2的负载。制备过程中，通过改变表面活性剂、体系溶剂类别以及磁载体制备条件来控制磁载体及催化剂的表面电位，促使TiO2牢固负载在PANI@纳米铁氧体表面。通过原位测定、理化性质表征以及磁性、光催化活性的考察，优化制备工艺，最终建立了具有高光催化活性和良好磁回收性能的TiO2@PANI@ Fe3O4、TiO2@Al2O3@Fe3O4以及TiO2@SiO2@Fe3O4光催化磁流体的制备方法。