In our work, the triethylenetetramine-modified hollow Fe₃O₄/SiO₂/chitosan magnetic nanocomposites (Fe₃O₄/SiO₂/CS-TETA) were successfully fabricated by a facile way. Due to hollow and porous nano structure, as well as modification by TETA, the Fe₃O₄/SiO₂/CS-TETA nanocomposites have more and stronger adsorption sites for chromium ions. The adsorption capacity of Cr(VI) ions was as high as 254.6 mg g^-1 and the adsorption equilibrium time was within 15 min, which are much superior than most similar adsorbents. In addition, the good magnetic recovery and reuse of the hollow Fe₃O₄/SiO₂/CS-TETA nanocomposites gives them excellent practical application capabilities for removal of Cr(VI) ions from wastewater. Thus, hollow Fe₃O₄/SiO₂/CS-TETA nanocomposites can be used as an ideal adsorbent for the recycle removal of Cr(VI) ions from wastewater.

在我们的工作中，通过简便的方法成功地制备了三亚乙基四胺改性的空心Fe ₃ O ₄ / SiO ₂ /壳聚糖磁性纳米复合材料（Fe ₃ O ₄ / SiO ₂ / CS-TETA）。Fe ₃ O ₄ / SiO ₂ / CS-TETA纳米复合材料由于具有中空多孔的纳米结构以及经TETA改性，对铬离子的吸附位点越来越强。Cr（VI）离子的吸附容量高达254.6 mg g ^-1，并且吸附平衡时间在15分钟内，这比大多数相似的吸附剂要好得多。此外，空心铁具有良好的磁性回收和再利用₃ O ₄ / SiO ₂ / CS-TETA纳米复合材料具有出色的实际应用能力，可从废水中去除Cr（VI）离子。因此，中空的Fe ₃ O ₄ / SiO ₂ / CS-TETA纳米复合材料可以用作从废水中循环去除Cr（VI）离子的理想吸附剂。