CTS@Fe3O4-COOH对低pH值Chlorella vulgaris采收性能及机理

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Abstract The magnetic material chitosan@citric acid modified Fe₃O₄ (CTS@Fe₃O₄-COOH) was synthesized by co-sedimentation method. The harvesting efficiency of Chlorella vulgaris under different conditions was investigated by single-factor and orthogonal tests. The combination with the structural property characterization of XRD, FT-IR and VSM, surface Zeta potential and the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory analysis to investigate the flocculation harvesting mechanism of CTS@Fe₃O₄-COOH on Chlorella vulgaris. The results implied that CTS@Fe₃O₄-COOH had high harvesting efficiency for Chlorella vulgaris, with an increase in harvesting efficiency of about 30% compared to unmodified. The single-factor test showed that the magnetic material dosage and pH had a greater effect on the harvesting efficiency of Chlorella vulgaris. The orthogonal test showed the best flocculation conditions of investigated variables were: 4.5g/L of CTS@Fe₃O₄-COOH, pH=4, rapid stirring at 500r/min in 3min, slow stirring 70r/min in 5min and the harvesting efficiency can reach 98.35%. Theoretical analyses such as DLVO suggested the harvesting mechanisms of CTS@Fe₃O₄-COOH on Chlorella vulgaris were charge neutralization, electrostatic path, adsorption bridging and sweeping flocculation. The results provide data support for the practical application of CTS@Fe₃O₄-COOH harvesting of fixed flue gases from energy microalgae.

Key words： microalgae harvesting CTS@Fe₃O₄-COOH Chlorella vulgaris magnetic flocculation

Received: 29 September 2021

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X703.5

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	CAO Xi-shuang
	XIN Xin
	YANG Hao
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CAO Xi-shuang,XIN Xin,YANG Hao等. The harvesting performance and mechanism of CTS@Fe₃O₄-COOH on low pH Chlorella vulgaris[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2169-2178.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I5/2169

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