高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

可磁分离的氮掺杂二氧化钛光催化剂的制备及光催化性能

许士洪1, 冯道伦2, 上官文峰3, 李登新1   

    1. 东华大学环境科学与工程学院, 上海 201620;
    2. 上海海事大学海洋环境与安全工程学院, 上海 200135;
    3. 上海交通大学机械与动力工程学院燃烧与环境技术研究中心, 上海 200240
  • 收稿日期:2007-10-24 修回日期:1900-01-01 出版日期:2008-06-10 发布日期:2008-06-10
  • 通讯作者: 许士洪

Preparation and Photocatalytic Properties of Magnetically Separated Nitrogen-doped TiO2

XU Shi-Hong1*, FENG Dao-Lun2, SHANGGUAN Wen-Feng3, LI Deng-Xin1   

    1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;
    2. College of Marine Environment and Security Engineering, Shanghai Maritime University, Shanghai 200135, China;
    3. Research Center for Combustion and Environment Technology, School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2007-10-24 Revised:1900-01-01 Online:2008-06-10 Published:2008-06-10
  • Contact: XU Shi-Hong

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摘要： 将氮掺杂二氧化钛和通过液相催化相转化制备的磁性载体混合、煅烧制备了一种可磁分离的光催化剂TiO2-xNx/SiO2/NiFe2O4(TSN), 这种光催化剂显示出了典型的铁磁性和可见光活性(λ>400 nm). 对该光催化剂的XRD谱图和透射电镜照片进行分析. 结果表明, SiO2/NiFe2O4(SN)纳米粒子黏附在TiO2-xNx聚集体的表面形成了TSN复合光催化剂. 利用光催化降解甲基橙的效果来评价这种光催化剂的活性. 结果表明, 在NiFe2O4和TiO2-xNx之间包覆一层无定形的SiO2, 可以显著地提高催化剂的脱色效果.

关键词: 磁分离, 光催化, 二氧化钛, 可见光

Abstract: A magnetically separated nitrogen-doped photocatalyst TiO2-xNx/SiO2/NiFe2O4(TSN) with a typical ferromagnetic hysteresis was prepared by a simple process: the magnetic SiO2/NiFe2O4(SN) dispersion and the visible-light-active photocatalyst TiO2-xNx were mixed, sonificated, dried, and calcined. The catalyst shows a photocatalytic activity for the degradation of methyl orange in water under visible light irradiation(λ>400 nm). X-ray diffractometer(XRD) and transmission electron microscope(TEM) were used to characterize the structure of photocatalyst TSN. The results indicate that the magnetic SN nanoparticles adhered to the surface of TiO2-xNx congeries. The degradation experiments of methyl orange indicate that the thin SiO2 layer between NiFe2O4 and TiO2-xNx could improve the photocatalytic activity of TSN.

Key words: Magnetical separation, Photocatalysis, TiO2, Visible light

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