日光下活性纳米TiO_2溶胶光降解性能的研究

High Photocatalytic Degradation Activity of Nanometer TiO_2 Hydrosol under Sunlight

于低温条件下(70℃)制备了纳米TiO2溶胶,研究了在日光照射下,纳米TiO2溶胶对甲基橙降解率的影响条件。实验结果表明,纳米TiO2溶胶可以在日光下很好地催化降解甲基橙,当甲基橙的浓度为2.5×10-5mol.L-1,TiO2的浓度为7.00×10-4mol.L-1,加入H2O2的浓度为6.3×10-4mol.L-1时,降解率可达92%。在溶液中加入Fe3+,亦可使降解率得到一定的提高。

Nano-TiO2 hydrosol was prepared by hydrolytic action of tetrabutyl titanate and the peptization precipitaye under 70 ℃ The effect of the hydrosol on the photocatalytic degradation rate of methyl orange dye under sunlight was investigated, and the degradation rate was high. The results showed that when the amount of methyl orange was 2.5 ×10^-5mol·L^-1, TiO2 was 7.00 ×10^-4mol·L^-1, H2O2 was 6.3 ×10^-4mol·L^-1, the degeneration rate could reached 92 %. It was also found that the rate of photocatalytic degradation of TiO2 loaded with Fe^3＋ was promoted.