Journal of Biology ›› 2022, Vol. 39 ›› Issue (5): 72-.doi: 10.3969/j.issn.2095-1736.2022.05.072

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

  

  1. College of Chemical Engineering and Materials, Tianjin University of Science and Technology, Tianjin 300457, China
  • Online:2022-10-18 Published:2022-10-18

Abstract: 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 12th 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.

Key words: chitosan fiber, MOF, Microcystis aeruginosa, inhibition, algal toxin

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