Affiliations: School of Chemical Engineering, Nanjing University of
Science and Technology, Nanjing 210094, China | School of Chemistry and Environmental Science, Nanjing
Normal University, Nanjing 210097, China
Abstract: TiO_2 sol was prepared by sol-gel technique with
tetrabutyl titanate as precursor. Supported TiO_2 catalysts
on activated carbon were prepared by soak and sintering method. The aggregation
of nano-TiO_2 particles can be effectively suppressed by
added polyethylene glycol (PEG) as a surface modifier. The average particle
diameter of TiO_2, specific surface area and absorbability
of catalyst can be modified. Based on characteristics of the
TiO_2 photocatalyst with XRD, specific surface area,
adsorption valves of methylene blue and the amount of TiO_2
supported on the activated carbon, the photocatalytic degradation of L-acid was
studied. The effect of the factors, such as pH of the solution, the initial
concentration of L-acid on the photocatalytic degradation of L-acid, were
studied also. It was found that when the pH of the solution is 1.95, the amount
ofphotocatalyst is 0.5 g, the concentration of the L-acid solution is 1.34
× 10^{-3} mol/L and the illumination time is 7 h, the photocatalytic
degradation efficiency of L-acid can reach 89.88%. The catalyst was reused 6
times and its degradation efficiency hardly changed.
