Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (03): 533-538.doi: 10.3866/PKU.WHXB20080332

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Effect of Pore Structure of Activated Carbon on the Photocatalytic Activity of TiO2/AC Composite Photocatalyst

LIU Shou-Xin; CHEN Xiao-Yun   

  1. Key Laboratory of Biological Materials of the Ministry of Education, Northeast Forestry University, Harbin 150040, P. R. China
  • Received:2007-08-03 Revised:2007-10-24 Published:2008-03-10
  • Contact: LIU Shou-Xin

Abstract: With the aim of investigating the effect of pore structure of activated carbon (AC) on the photocatalytic activity of TiO2/AC composite photocatalyst, 4 kinds of AC with similar surface chemical characteristics and different pore structures were used and compared. Phenol degradation was used for photocatalytic activity test. N2 adsorption isotherm (77 K) was used for BET surface area (SBET), pore volume, and pore size distribution measurement. Boehm titration and elemental analysis were used for surface chemical characteristics determination. XRD, DRS, and SEM were used to characterize the crystal structure, spectra characteristics, and surface properties. The results showed that the pore structure of AC had significant effect on the photocatalytic activity of TiO2/AC. The synergistic coefficients for the activity enhancement of AC1, AC2, AC3, and AC4 were 1.55, 2.03, 1.28, and 1.43, respectively, which exhibited the similar tendency with the contact interface (⊿S). AC with both developed micropore and mesopore structures exhibited the highest activity when composited with TiO2. The developed micropore structure can provide more adsorption sites for pollutant molecules. More mesopore can be beneficial to the transfer of adsorbed phenol from adsorption sites to active TiO2. Also, the mesopore can inhibit the aggregation of nano-size TiO2, improve its dispersion and increase the contact interface between AC and TiO2.

Key words: Activated carbon, Pore structure, TiO2, Photocatalysis activity


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