载Fe^(3+)纳米TiO_2薄膜去除球形棕囊藻赤潮生物的研究

Study on visible photocatalysis removal of Phaeocystis globosa by use of Fe^(3+)-doped Nano-TiO_2 film

球形棕囊藻Phaeocystis globosa是近年来在我国沿海频发的有毒有害赤潮藻。为了寻找一种简单、有效和安全的去除赤潮藻的方法,探讨了纳米TiO2薄膜以及载Fe3+纳米TiO2薄膜在可见光条件下对球形棕囊藻的除藻效果。结果表明,载Fe3+纳米TiO2除藻效果好于未载Fe3+的纳米TiO2,藻液中投加载Fe3+纳米TiO2薄膜的量为20mg·L-1时,可见光照射48h后,藻液中细胞密度由4.08×104cell·mL-1降低到0.01×104cell·mL-1,叶绿素a浓度由0.43mg·L-1降低到0.001mg·L-1,除藻率达到99.7%,除藻速率符合准一级反应动力学方程。

Phaeocystis globosa is harmful algae species,which booms along the coast of China frequently during recent years.In order to find a simple,effective and safe method to remove P.globosa,research was carried out using nano-TiO2 or Fe3＋-droped nano-TiO2 thin film to remove P.globosa under visible light.The authors find that Fe3＋-droped nano-TiO2 is more effective in removing P.globosa than nano-TiO2.After using 20mg·L-1 Fe3＋-droped nano-TiO2 for 48 h visible light treatment,the algal density reduced to 0.01×104cell.mL-1 from 4.08×104cell·mL-1,and the consistency of Chl-a reduced to 0.001mg·L-1 from 0.43mg·L-1,namely more than 99.7% cells were removed.The dynamics of algal removal follows the first order reaction.