Abstract
We designed and synthesised a magnetic adsorbent (Fe3O4@Si–OH@CS-Glu) combining chitosan-silanol groups with glutaraldehyde as a cross-linking agent, which has improved physicochemical properties and can be used to remove multiple heavy metals and bacteria from polluted water. The adsorbent was characterised with SEM, XRD, FTIR, BET, VSM, and zeta potential. Under optimum conditions, the adsorption efficiencies of Fe3O4@Si–OH@CS-Glu for Cr6+, As5+, Hg2+, and Se6+ were as high as 90.5%, 73.5%, 91.6%, and 100% respectively. In addition, Escherichia coli (gram-negative) and Staphylococcus aureus (gram-positive) can be removed after 2–4 adsorption cycles with 2.5 mg Fe3O4@Si–OH@CS-Glu. The main adsorption mechanism of the adsorbent for heavy metals and bacteria is electrostatic adsorption. Overall, the synthesised Fe3O4@Si–OH@CS-Glu adsorbent showed high removal efficiency and adsorption capacity with a stable structure and easy separation. It has promising applications for the removal of heavy metals and bacteria from water.
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This study was supported by the National Key R&D Program of China (grant no. 2017YFC1601101). The funders played no role in study design, collection, analysis, or interpretation of data, the writing of the report, or the decision to submit the article for publication.
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Huanying Zhou and Zhangrun Xu conceived the project. Tie Han and Zhixian Gao prepared all the materials for experiments and characterizations. Shuyue Ren and Shuang Li performed data analysis. Xueli Liu, Yonghui Wang, and Qibo Liu summarised all data and drafted the manuscript. All authors discussed the results and commented on the manuscript.
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Liu, Q., Wang, Y., Liu, X. et al. Glutaraldehyde base-cross-linked chitosan-silanol/Fe3O4 composite for removal of heavy metals and bacteria. Environ Sci Pollut Res 29, 69439–69449 (2022). https://doi.org/10.1007/s11356-022-20673-5
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DOI: https://doi.org/10.1007/s11356-022-20673-5