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Keywords:

  • thienyl-appended porphyrin;
  • metalloporphyrin;
  • titanium dioxide;
  • photocatalytic degradation;
  • 4-nitrophenol

Abstract

5-Mono-(2-thienyl)-10,15,20-triphenyl porphyrin (H2MTP) and its Co(II), Cu(II), Zn(II) metalloporphyrins (CoMTP, CuMTP, ZnMTP) were synthesized and characterized spectroscopically. The corresponding Co(II), Cu(II), Zn(II) metalloporphyrins-TiO2 photocatalysts were then prepared and characterized by means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), UV-vis spectra and FT-IR. The photocatalytic activities of these photocatalysts were investigated by testing the photodegradation of 4-nitrophenol (4-NP) in aqueous solution under irradiation with high-pressure mercury lamp and metal halide lamp respectively. The results indicated that these metalloporphyrins greatly enhanced the photocatalytic efficiency of bare TiO2 in degradating the 4-NP, and CuMTP-TiO2 exhibited the highest photocatalytic activity of all photocatalysts. In addition, the first order rate constants of these photocatalytic reactions were calculated.