NIU Jinfen¹, YAO Binghua¹, LIU Tingting¹

(1.Department of Applied Chemistry, Xi’an University of Technology, Xi’an 710048, China)

Abstract: The original porphyrin of meso-5,10,15,20-tetra(4-hydroxylphenyl) porphyrin (THPP) was synthesized by Alder method. Four metal porphyrin complexes of original porphyrin with Zn²⁺ , Ni²⁺ ,Cu²⁺ , Co²⁺ were synthesized by the method of room temperature solid state synthesis, denoted as MTHPP. Using four kinds of metal porphyrin(MTHPP) as sensitizer, anatase TiO₂ samples producing by stream method were impregnated with metal porphyrin to form MHTPP/TiO₂ composite photocatalysts. The photocatalysts were characterized by IR,VU-Vis,SEM, and XRD. The results showed that the crystal structure and morphology of TiO₂ were not effected by the exist of porphyrin on its surface. The photocatalytic activity of MHTPP/TiO₂ composite photocatalysts were investigated by carrying out the photodegradation of methylene blue(MB) in aqueous suspension and under visible light. The degradation test results show that ZnTHPP/TiO₂ composite exhibited the best performance among the four composite catalysts. The photocatalysts show good stability under irradiation conditions and they continued to maintain good photocatlytic activity also after several cycles.

Key words: metal porphyrin; TiO₂; sensitize; methylene blue; photocatalysts

E-mail: bhyao@xaut.edu.cn 

Journal of Molecular Catalysis, Vol. 25, Issue 5, 2011, 435-441