化学学报 ›› 2012, Vol. 70 ›› Issue (20): 2173-2178.DOI: 10.6023/A12060341 上一篇    下一篇

研究论文

N-P-TiO2纳米粒子的溶胶-水热制备及太阳光下光催化降解4-氯酚性能

姜洪泉, 王巧凤, 李井申, 王庆元, 李振宇   

  1. 哈尔滨师范大学功能材料设计合成与绿色催化黑龙江省高校重点实验室 哈尔滨 150025
  • 投稿日期:2012-06-25 发布日期:2012-09-24
  • 通讯作者: 姜洪泉 E-mail:h.q.jiang1119@163.com
  • 基金资助:

    项目受哈尔滨师范大学青年学术骨干资助计划(No. 08XBSK89)和黑龙江省高校科技创新团队建设计划(No. 2011TD010)资助.

Sol-hydrothermal Preparation of N-P-TiO2 Nano-particles for Photocatalytic Degradation of 4-Chlorophenol under Sunlight Irradiation

Jiang Hongquan, Wang Qiaofeng, Li Jingshen, Wang Qingyuan, Li Zhenyu   

  1. Key Laboratory of Design and Synthesis of Functional Materials and Green Catalysis, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150025
  • Received:2012-06-25 Published:2012-09-24
  • Supported by:

    Technological Innovation Team Construction in Universities of Heilongjiang Province (No. 2011TD010).

以尿素和磷酸为掺杂剂、冰醋酸为抑制剂, 利用溶胶-水热技术制备了介孔锐钛矿型N-P-TiO2片状纳米粒子; 以4-氯酚溶液在模拟太阳光照射下的光催化降解评价其光活性; 结合XRD, TEM, BET, XPS, DRS, PL和ζ-电位分析, 探讨了N和P掺杂对TiO2光活性的影响机制. 结果表明, 与未掺杂、N或P单掺杂TiO2相比, N-P共掺杂TiO2具有更高的光催化降解4-氯酚活性. N-P共掺杂TiO2的可见光响应是由N 2p, P 3p分别与O 2p轨道杂化导致带隙窄化引起的. N-P共掺杂产生协同作用, 进一步改善TiO2的表面织构特性, 增加表面羟基, 抑制光生e-/h+复合, 增强表面酸性提高其水分散性, 导致N-P共掺杂TiO2的光活性提高.

关键词: 纳米TiO2, N-P共掺杂, 溶胶-水热, 可见光响应, 协同效应

Mesoporous N-P-codoped anatase-TiO2 nano-sheets were successfully synthesized by a sol-hydrothermal method which utilized urea and phosphorous acid as dopants, and glacial acetic acid as inhibiting agent. Their photoactivities were evaluated by the photocatalytic degradation of 4-chlorophenol (4-CP) in aqueous solution under simulated sunlight irradiation. In combination with XRD, TEM, BET, XPS, DRS, PL and zeta potential characterization, the effect mechanisms of N and P doping on the photoactivities of TiO2 were discussed. The results revealed that the N-P-codoped TiO2 exhibited higher photocatalytic activity for 4-CP degradation than the undoped, N-doped or P-doped TiO2. The visible light response of the N-P-codoped sample may be attributed to narrowing of the band gap resulted from hybridization by the 2p orbits of N atom, 3p orbits of P atom and the 2p orbits of O atom, respectively. The N-P-codoping can further improve the surface texture properties of TiO2, and increase the surface hydroxyl, and inhibit the recombination of photogenerated electrons and holes, and enhance the dispersive capacity in water due to the increase of the surface acidity, which imply that the N-P-codoping produces synergetic effects, therefore resulting in the enhanced photoactivity of N-P-codoped TiO2.

Key words: nano-TiO2, N-P-codoping, sol-hydrothermal, visible light response, synergetic effect