Visible light photocatalytic activity of rutile TiO2 fiber clusters in the degradation of terephthalic acid


YENER H. B. , HELVACI Ş. Ş.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, cilt.120, ss.967-976, 2015 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 120 Konu: 3
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1007/s00339-015-9263-4
  • Dergi Adı: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
  • Sayfa Sayıları: ss.967-976

Özet

Rutile TiO2 nanoparticles, in different structural and morphological properties, were produced by the hydrolysis of titanium tetrachloride in a highly acidic reaction media at moderate temperatures without calcination. Their photocatalytic activities were investigated in the liquid-phase degradation of terephthalic acid under visible light illumination. The parameters, which are the concentration of the titanium tetrachloride solution (0.1-1 M) and reaction temperature (60-95 A degrees C), effective on the properties of the particles, and their photocatalytic performances, were investigated. The XRD patterns indicated a pure rutile crystal structure at moderate temperatures without need of calcination. The FEGSEM images showed the formation of flower-, pinecone-, and sphere-like clusters consisting of interconnected nanofibers. The N-2 adsorption-desorption isotherms pointed out the microporous structure of the clusters. Band gap energies were found to be varying between 3.02 and 3.08 eV due to the well-developed rutile crystallite structure. Systematic studies elucidated that the optimum reactant concentration and reaction temperature are 0.5 M TiCl4 and 95 A degrees C, respectively. The rutile clusters synthesized at the optimum reaction conditions exhibited 99 % of the photocatalytic degradation of TPA under visible light illumination at shorter irradiation times compared with commercial P25 TiO2.