The photocatalyst consisted of titanium dioxide loaded on natural zeolite was prepared by impregnation of tetrabutyl titanate acidic solution followed by calcination. The photocatalytic activity of the catalyst towards dichlorvos has been examined as function of TiO 2 amount, calcination temperature of precursor, pH of sample solution and added amount of H 2O 2. The results indicated that the catalyst prepared by calcination at 200 ℃ showed the highest activity and 89% of Dichlorvos in concentration of 1.0×10 -4 mol/L could be degraded over the catalyst under sunlight illumination for 6 hours.
A mathematical model of surface tension for fluoropolymer modified polyacrylate emulsion was established by using the statistic method in this paper.The surface tension for emulsion was relative to the volume fraction of mixed monomer,water and fluoropolymer powder dosage in the mathematical model.Attention was focused on the statistics of experimental data instead of the calculation of subtle complex thermodynamic processes.Good agreement was obtained between calculated data and experimental data.The relative error was less than 10%.As a practical method, the surface tension predicted by the mathematical model presented in this paper can be used to predict other important properties of emulsion film.
