State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, College of Resources and Environment, Institute of Biochemical Engineering & Environmental Technology, Lanzhou University, Lanzhou 730000, PR China.
J Hazard Mater. 2013 Sep 15;260:9-15. doi: 10.1016/j.jhazmat.2013.05.001. Epub 2013 May 10.
A new kind of nano-absorbent with the entirely novel structure, nano-absorbent of multi-cyanogunidine modified magnetic chitosan (CG-MCS nano-absorbent), has been firstly synthesized by using the functionalized chitosan and cross-linking agent with cyanoguanidine group simultaneously. The resulting nano-absorbent was characterized by means of the Fourier transform infrared spectra (FT-IR), transmission electron microscope (TEM), X-ray diffraction (XRD), elemental analysis and vibrating sample magnetometer (VSM). The resulting nano-absorbent basen on multi-cyanoguanidine modified magnetic chitosan has been demonstrated holding highly effective recovery for mercury ions, in other words, it showed both the extraordinary adsorption capacity for Hg(II) at high initial concentration and the strong removal ability for it at low concentration, the maximum adsorption capacity was up to 285 mg g(-1) and the removal percentage could reach 96% at low concentration. Meanwhile, the resulting CG-MCS nano-absorbent also showed a high selectivity adsorption for Hg(II) among coexisting heavy metals and the good regeneration performance.
一种全新结构的纳米吸收剂，即多氰基胍改性磁性壳聚糖（CG-MCS 纳米吸收剂），首次通过功能化壳聚糖和带有氰基胍基团的交联剂同时合成。通过傅里叶变换红外光谱（FT-IR）、透射电子显微镜（TEM）、X 射线衍射（XRD）、元素分析和振动样品磁强计（VSM）对得到的纳米吸收剂进行了表征。结果表明，基于多氰基胍改性磁性壳聚糖的纳米吸收剂对汞离子具有非常高的有效回收能力，也就是说，它在高初始浓度下对 Hg(II) 表现出了非凡的吸附能力，在低浓度下对其具有很强的去除能力，最大吸附容量高达 285mg/g，低浓度时去除率可达 96%。同时，得到的 CG-MCS 纳米吸收剂对共存重金属中的 Hg(II) 也表现出了高选择性吸附和良好的再生性能。
