负载型共掺杂TiO_2对城市废水的日光降解作用

Performance of Sunlight Catalytic Degradation of Urban Waste water of Carried Co-doped TiO_2

采用过渡金属与稀土离子共掺杂对TiO2/漂珠光催化剂进行改性,以提高其日光催化性能。以紫外-可见漫反射光谱研究了粉煤灰微珠负载共掺杂TiO2光催化剂的光吸收性能;考察了催化剂对城市废水的日光催化降解性能。实验结果表明:所制备的各种共掺杂TiO2/漂珠催化剂在太阳光照射下对有机废水有较好的降解效果;废水的pH=6.5、催化剂投入量为3.5g/L时,其降解率最大,日光照射5 h后,降解率可以达到85.12%(CODCr)和73.4%(NH3-N)。催化剂使用后可以活化再生2次。

TiO2/cenosphere photocatalyst was modified via co-doped with transition metal ions and rare earth metal ions to raise its sunlight catalytic activity.Sunlight absorption performances of the co-doped TiO2/cenosphere photocatalysts were investigated by UV-visible spectrophotometer.The degradation capacities of city waste water on the co-doped TiO2/cenosphere photocatalysts were studied.The results show that the sunlight photocatalytic activity of the co-doped TiO2/cenosphere was better.They possess the best degradation capacity when the pH value of waste water = 6.5 and the catalyst dosage at 3.5 g/L.The degradation rate of city waste water could reach 85.12%（CODCr） and 73.4%（NH3-N） after 5 h sunlight irradiation.The used-up photocatalyst could be reactivated 2 times.