The harvesting performance and mechanism of CTS@Fe3O4-COOH on low pH Chlorella vulgaris
CAO Xi-shuang1, XIN Xin1,2, YANG Hao1, E Di1
1. College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, China; 2. China-Serbia "the Belt and Road" Joint Laboratory on Environment and Energy, Chengdu 610225, China
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.
曹惜霜, 信欣, 杨豪, 鄂荻. CTS@Fe3O4-COOH对低pH值Chlorella vulgaris采收性能及机理[J]. 中国环境科学, 2022, 42(5): 2169-2178.
CAO Xi-shuang, XIN Xin, YANG Hao, E Di. The harvesting performance and mechanism of CTS@Fe3O4-COOH on low pH Chlorella vulgaris. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2169-2178.
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