Optimization on preparation of Fe 3 O 4 /chitosan as potential matrix material for the removal of microcystin-LR and its evaluation of adsorption properties

Adsorbent Fe O /chitosan was successfully synthesized for the removal of microcystin-LR and characterized by Scanning electron microscope, Fourier transform infra-red, thermogravimetric analysis and vibrating sample magnetometer. The effects of reaction conditions, including pH, temperature and rati...

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Bibliographic Details
Published in:International journal of biological macromolecules 2020-08, Vol.156, p.1574
Main Authors: He, Yafei, Wu, Pian, Li, Guiyin, Li, Lei, Yi, Jiecan, Wang, Shanlin, Lu, Siyu, Ding, Ping, Chen, Cuimei, Pan, Hongzhi
Format: Article
Language:English
Subjects:
Adsorption
Chitosan - chemistry
Ferric Compounds - chemistry
Hydrogen-Ion Concentration
Kinetics
Marine Toxins - chemistry
Marine Toxins - isolation & purification
Microcystins - chemistry
Microcystins - isolation & purification
Temperature
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
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Summary:Adsorbent Fe O /chitosan was successfully synthesized for the removal of microcystin-LR and characterized by Scanning electron microscope, Fourier transform infra-red, thermogravimetric analysis and vibrating sample magnetometer. The effects of reaction conditions, including pH, temperature and ratio of Fe O to chitosan on microcystin-LR adsorption capacity were investigated by the Box-Behnken response surface methodology design, and the optimal adsorption conditions were determined. The adsorption properties of microcystin-LR were examined by adsorption kinetics, isothermal and thermodynamics experiments. The results demonstrated that Fe O /chitosan was successfully prepared and the maximum adsorption capacity of microcystin-LR was under optimum conditions in which pH value was 5.53, temperature was 40 °C and the ratio of Fe O to chitosan was 1:1.39. The data revealed that kinetics was fitted well with the pseudo-second-order model, Langmuir isotherm model was more appropriate for describing than the Freundlich isotherm model and the adsorption of microcystin-LR was a spontaneous process. The material maintained good adsorption capacity after five cycles. The results suggested that Fe O /chitosan was an efficient and low-cost adsorbent for removing microcystin-LR from polluted water.
ISSN:1879-0003