摘要
采用自制纳米TiO_2粉末，以磷酸铝为粘结剂，制备了负载型TiO_2光催化剂。将Ag，Pt或Pd 3种金属的盐溶液滴涂在负载TiO_2的表面，从而得到修饰型负载光催化剂(M／TiO_2)。通过甲基橙溶液降解实验研究了贵金属的掺杂种类和含量对TiO_2光催化性能的影响。实验结果表明：适量掺杂Ag，Pt或Pd 3种金属粒子均可提高TiO_2的光催化活性，且3种金属粒子的最佳掺杂质量分数分别为0.5％，1.0％和1.0％。在最佳掺杂量时，Ag／TiO_2[ω(Ag)=0.5％]的光催化活性要高于Pt／TiO_2[ω(Pt)=1.0％]或Pd／TiO_2[ω(Pd)=1.0％]。另外，通过金属一半导体接触理论阐述了M／TiO_2的光催化机理，并通过Ag，Pt，Pd金属的Fermi能级的不同，解释了Ag／TiO_2，Pt／TiO_2和Pd／TiO_2 3种光催化剂催化性能的差别。
Supported TiO2 photocatalysts were prepared with aluminum phosphate as bonding agent. Photocatalysts modified with noble metal (M/TiO2) were obtained by dropping salt solution of Ag, Pt or Pd on the surface of supported TiO2. The effects of doping agent and doping concentration on photocatalytic properties were investigated by photocatalytic degradation of methyl orange solution. The results show that the photocatalytic activities can be improved by doping Ag, Pt or Pd. As every dopant has optimal doping concentration the photocatalytic properties of Ag/TiO2 [w(Ag)=0.5%, mass fraction, the same below] are better than those of Pt/TiO2 [w(Pt)=1.0%] or Pd/TiO2 [w(Pd)=1.0%]. The photocatalytic mechanism of M/TiO2 is explained by the theory of metal-semiconductor contacts and the difference in photocatalytic properties of Ag/TiO2, Pt/TiO2 and Pd/TiO2 is analyzed by accounting and comparing their Fermi level.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第12期1538-1541,共4页
Journal of The Chinese Ceramic Society
基金
天津市自然科学基金(013603811)博士点基金(20030056001)
