Research Center for Analytical Sciences, Northeastern University, Shenyang, 110819, China.
Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Tianjin Institute of Environmental and Operational Medicine, Tianjin, 300050, China.
Environ Sci Pollut Res Int. 2022 Oct;29(46):69439-69449. doi: 10.1007/s11356-022-20673-5. Epub 2022 May 14.
We designed and synthesised a magnetic adsorbent (FeO@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 FeO@Si-OH@CS-Glu for Cr, As, Hg, and Se 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 FeO@Si-OH@CS-Glu. The main adsorption mechanism of the adsorbent for heavy metals and bacteria is electrostatic adsorption. Overall, the synthesised FeO@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.
我们设计并合成了一种磁性吸附剂（FeO@Si-OH@CS-Glu），它结合了壳聚糖-硅醇基团和戊二醛作为交联剂，具有改善的物理化学性质，可以用于从污染水中去除多种重金属和细菌。该吸附剂采用 SEM、XRD、FTIR、BET、VSM 和 zeta 电位进行了表征。在最佳条件下，FeO@Si-OH@CS-Glu 对 Cr、As、Hg 和 Se 的吸附效率分别高达 90.5%、73.5%、91.6%和 100%。此外，经过 2-4 次吸附循环后，用 2.5 mg FeO@Si-OH@CS-Glu 可以去除革兰氏阴性菌大肠杆菌和革兰氏阳性菌金黄色葡萄球菌。吸附剂对重金属和细菌的主要吸附机制是静电吸附。总的来说，合成的 FeO@Si-OH@CS-Glu 吸附剂具有高效去除率和吸附容量，结构稳定，易于分离，在从水中去除重金属和细菌方面具有广阔的应用前景。
