CS-MOF纤维对铜绿微囊藻的抑制效果及机理

Inhibitory effect and mechanism of CS-MOF fiber on Microcystis aeruginosa

针对净水厂除藻问题,选取壳聚糖纤维和金属有机骨架(metal organic framework,MOF)为原材料,制备具有较强抑藻性能的复合材料CS-MOF,研究CS-MOF纤维对铜绿微囊藻生长、细胞结构、光合作用、抗氧化酶活性以及微囊藻毒素的影响。结果表明:CS-MOF纤维能够有效抑制铜绿微囊藻生长,抑制率随投加量的增加而升高,当投加量为0.6 g/L时,第12天的抑藻率可达85.6%。扫描电镜图显示,处理组的藻细胞受损严重,细胞形态发生显著改变。实验过程中,处理组的藻细胞光合系统遭到破坏,藻体中叶绿素a、类胡萝卜素和藻胆蛋白含量均呈下降趋势,对藻胆蛋白的抑制率明显高于叶绿素a和类胡萝卜素的抑制率。CS-MOF纤维能够破坏藻细胞的抗氧化酶系统,通过抑制SOD活性,使藻细胞受到更严重的损伤。此外,CS-MOF纤维通过抑制藻类生长和吸附藻毒素,可有效降低总藻毒素含量。

In order to solve the problem of algae removal in water treatment plant,chitosan fiber and metal organic framework(MOF)were coupled to prepare a composite material(CS-MOF)with algae inhibition function.The effects of CS-MOF fiber on the growth,cell structure,photosynthesis,antioxidant enzyme activity and microcystin of Microcystis aeruginosa were studied.The results showed that CS-MOF fiber could effectively inhibit the growth of Microcystis aeruginosa,and the inhibition rate increased with the increase of dosage.When the dosage was 0.6 g/L,the inhibition rate of Microcystis aeruginosa could reach 85.6%on the 12 th day.Scanning electron microscope showed that the algal cells in the treatment group were seriously damaged and the cell morphology changed significantly.During the experiment,the photosynthetic system of the treatment group was destroyed.The contents of chlorophyll a,carotenoid and phycobiliprotein in the algae decreased,and the inhibition rate of phycobiliprotein was significantly higher than that of chlorophyll a and carotenoid.CS-MOF fiber can destroy the antioxidant enzyme system of algae cells,and make algae cells suffer more serious damage by inhibiting SOD activity.In addition,CS-MOF fiber can effectively reduce the content of total algal toxin by inhibiting algal growth and adsorbing algal toxin.