Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia "St. Kliment Ohridski", 1 James Bourchier blvd., Sofia, Bulgaria; Department of Analytical Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia "St. Kliment Ohridski", 1 James Bourchier blvd., Sofia, Bulgaria.
Department of General and Inorganic Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia "St. Kliment Ohridski", 1 James Bourchier blvd., Sofia, Bulgaria.
Carbohydr Polym. 2016 Aug 20;147:45-52. doi: 10.1016/j.carbpol.2016.03.080. Epub 2016 Mar 29.
The present study describes the ecofriendly method for the preparation of chitosan film loaded with silver nanoparticles (CS-AgNPs) and application of this film as efficient sorbent for separation and enrichment of Al(III), Cd(II), Cu(II), Co(II), Fe(III), Ni(II), Pb(II) and Zn(II). The stable CS-AgNPs colloid was prepared by dispersing the AgNPs sol in chitosan solution at appropriate ratio and further used to obtain a cast film with very good stability under storage and good mechanical strength for easy handling in aqueous medium. The incorporation of AgNPs in the structure of CS film and interaction between the polymer matrix and nanoparticles were confirmed by UV-vis and FTIR spectroscopy. The homogeneously embedded AgNPs (average diameter 29nm, TEM analysis) were clearly observed throughout the film by SEM. The CS-AgNPs nanocomposite film shows high sorption activity toward trace metals under optimized chemical conditions. The results suggest that the CS-AgNPs nanocomposite film can be feasibly used as a novel sorbent material for solid-phase extraction of metal pollutants from surface waters.
本研究描述了一种环保的方法来制备负载银纳米粒子（CS-AgNPs）的壳聚糖膜，并将该膜用作分离和富集 Al(III)、Cd(II)、Cu(II)、Co(II)、Fe(III)、Ni(II)、Pb(II) 和 Zn(II) 的有效吸附剂。通过将 AgNPs 溶胶分散在壳聚糖溶液中适当的比例来制备稳定的 CS-AgNPs 胶体，进一步获得在储存过程中具有非常好的稳定性且在水介质中易于处理的良好机械强度的铸膜。通过紫外-可见光谱和傅里叶变换红外光谱证实了 AgNPs 在 CS 膜结构中的掺入以及聚合物基质和纳米粒子之间的相互作用。通过 SEM 可以清楚地观察到整个膜中均匀嵌入的 AgNPs（平均直径 29nm，TEM 分析）。在优化的化学条件下，CS-AgNPs 纳米复合材料膜对痕量金属表现出高的吸附活性。结果表明，CS-AgNPs 纳米复合材料膜可以作为一种新型的吸附材料，用于从地表水中固相萃取金属污染物。
