氧化铁纳米颗粒固定化溶藻菌的除藻作用研究
首发时间:2006-10-10
摘要:[目的]探讨氧化铁纳米颗粒固定化溶藻菌后对铜绿微囊藻的溶藻作用和降解微囊藻毒素LR(MC-LR)的作用。[方法]从太湖水体中分离获得一株属于芽孢杆菌属的溶藻菌。将其与氧化铁纳米颗粒固定化后,以普通Fe2O3作为实验对照,测定其溶藻作用和降解MC-LR作用。同时以激光粒度仪测定氧化铁纳米颗粒与溶藻菌两者单独和同时存在时的粒径大小及粒径分布,以获得氧化铁纳米颗粒固定化溶藻菌的证据。[结果]在太湖水体中分离获得的一株芽孢杆菌具有较强的溶藻和降解MC-LR的作用,作用24h后的溶藻率和MC-LR降解率分别达到44.3%和20.5%。同时加入氧化铁纳米颗粒后,溶藻率达到53.0%,MC-LR的降解率达到33.0%。激光粒度仪检测发现,氧化铁纳米颗粒与细菌混合后的颗粒物的平均直径增加到氧化铁纳米颗粒的12.3倍,同时氧化铁纳米颗粒和细菌单独存在时的粒径分布峰消失。[结论] 氧化铁纳米颗粒是一种具有良好性能的生物固定化材料,可能通过其特有的途径有效地固定化溶藻菌,并增强溶藻菌的溶藻和降解藻毒素作用。
关键词: 溶藻菌 氧化铁纳米颗粒 固定化 铜绿微囊藻 微囊藻毒素
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Algae-lytic Effect of Algicadal bacteria Immobilized on Nanoparticles of Fe2O3
Abstract:[Objective] To investigate the performance and ability of Fe2O3 nanoparticles for algicidal bacteria immobilization, and to evaluate the algae-lytic effect and microcystin-LR degradation of algicadal bacteria Immobilized on nanoparticles of Fe2O3. [Methods] A kind of algicidal bacterium, which was isolated from Taihu Lake identified as Bacillus, were immobilized on nanoparticles of Fe2O3. Then aglae-lysing rates and microcystin-LR degradation rates of the bacteria immobilized on nanoparticles of Fe2O3 were determined at 6h,12h and 24h. The laser particle size analysator was used to measure particle diameter distribution and mean diameter of them. [Results] The bacteria isolated from Taihu Lake were proven to have the significant effect of algicidal activity and degradation of microcystin-LR. The results showed that the 24h aglae-lysing rate and the microcystin-LR degradation rate of the bacteria with 104/mL of microcytis aeruginosa were 44.3% and 20.5%, respectively. When immobilized on nanoparticles of Fe2O3,the 24h aglae-lysing rate and he microcystin-LR degradation rate of the bacteria were 53.0% and 33.0%, respectively. The mean diameter of the bacteria immobilized on nanoparticles of Fe2O3 was 16.14μm, which was 12.3 folds of the nanoparticles of Fe2O3. [Conclusion] The results suggest that Fe2O3 nanoparticles, as a kind of artificial medium, could effectively immobilized algicidal bacteria, and significantly strengthen the algae-lytic effect of bacteria to microcytis aeruginosa and degradation of microcystin-LR.
Keywords: algicidal bacteria;nanoparticles of Fe2O3; immobilization;microcytis aeruginosa;microcystin
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No.8666777131160453****
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氧化铁纳米颗粒固定化溶藻菌的除藻作用研究
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