TiO_2光催化失活复活特性与表面NO_3^-浓度的关系

TiO_2 Photocatalytic Deactivation and Regeneration vs Adsorbed NO_3^- Concentration

以乙醛作为活性标的,通过人为控制表面附着NO3-浓度,检测TiO2对乙醛的吸附能力和光催化降解能力,得出了TiO2光催化失活复活特性和表面附着NO3-浓度的定量关系。结果表明,表面附着NO3-浓度达到4.24wt%时,光催化降解能力降低50%;表面附着NO3-浓度达到10.50wt%时,TiO2的吸附能力降低50%;通过溢流状态下水洗2h,可除去98%的表面附着NO3-,使TiO2光催化活性复活。

The quantitative relation between deactivation and the adsorbed NO3- concentration was studied by intentionally controlling the adsorbed NO3- concentration. The photolysis ability and adsorption ability of TiO2 was detected against acetaldehyde as a probe. The results show that when the adsorbed NO3- concentration reaches 4.24wt%, photolysis ability decreases 50%; when the adsorbed NO3- concentration is 10.50wt%, the TiO2 adsorption ability decreases 50%; after water overflow-cleaning 2 h, the NO3- is removed by 98% and the photocatalytic activity is regenerated.