Effect and mechanism of magnetic floatable bead VMB@Fe3O4@CS on removing Anabaena and Microcystis
In order to effectively treat harmful algal blooms and avoid secondary pollution by chemical substances,maglev beads VMB@Fe3O4@CS were synthesized through a novel method combined with magnetic flocculation and float flotation which use vitrified microbeads,Fe3O4 and chitosan as raw materials,to remove Anabaena flos-aquae and Microcystis aeruginosa.The results showed that the optimal removal efficiencies of the two species of algae were 99.01%(0.12g/L)and 98.6%(0.21g/L),respectively.VMB@Fe3O4@CS achieved a high removal rate(＞60%)in a wide pH range(4～10)and water temperature range(5～35℃),and the increase of ionic strength had a negative effect on the removal of microalgae.Through morphological observation,surface hydrophobicity and Zeta potential analysis,it was determined that electrostatic attraction and adsorption bridging were the main flocculation mechanisms of maglev beads on algal cells.The experimental results show that the prepared VMB@Fe3O4@CS has a great potential to control harmful algal blooms.
万方数据
维普
