改性纳米TiO2对蓝藻的生理生态影响

在自然光照条件和日光灯光照条件下，用掺1％Ag纳米TiO2、掺5％Fe2O3纳米TiO2、掺10％ZnO纳米TiO2和纯纳米TiO2对铜绿微囊藻（Synechocystis sp．）PCC6803和集胞藻（Microcystis aeruginosa）进行处理，并对2种藻样的叶绿素含量、类胡萝卜素含量、体外超氧自由基含量及超氧化物歧化酶（superoxidase dismutase，SOD）活性进行测定。结果表明，自然光照条件比日光灯光照条件更利于纳米材料光催化反应的进行；改性后的3种纳米材料对蓝藻的抑制效果要好于纯纳米TiO2，其中效果最好的为掺1％Ag纳米TiO2；2种藻样在适应由光催化剂引发光催化而产生的自由基胁迫时，集胞藻的适应能力比铜绿微囊藻更强。

Effects of Dopant Nano TiO2 on Vegetal Physiology of Blue-green Algae

Synechocystis sp. PCC6803 and Microcystis aeruginosa were treated with the dopant nano TiO2 components 1% Ag, 5% Fe2O3, 10% ZnO, and nano TiO2 alone under natural illumination and fluorescent conditions. We determined the content of chlorophyll a, carotenoids, extracellular O2 and superoxide dismutase activity in samples. The natural illumination condition was more effective than the fluorescent condition in the photocatalysis of nanometer material. The dopant nano materials were more effective than nano material alone in inhibiting growth of blue-green algae, 1% Ag having the best inhibitory effect. M. aeruginosa has a stronger ability to adapt to superoxide anion stress produced by photocatalysis of nano TiO2 than Synechocystis sp.