N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Prospect, Moscow, Russia.
Environ Int. 2011 Aug;37(6):1044-52. doi: 10.1016/j.envint.2011.05.003.
A series of chitosan-stabilized Pd-NZVI (nano-zero-valent-iron) catalysts for dechlorination with variation in their composition and in the nature of the polymer has been prepared. The synthesis procedures and palladium and chitosan contents were optimized. It was demonstrated by the XPS method that Fe and Pd in Fe-Pd/chitosan samples exist in the metallic state. The positive shift of the binding energy as compared with the bulk metal shows that the iron metal in the surface layers exists as very small nanoparticles. The prepared materials were characterized also by the XAS method. The presence of O and N atoms in the first coordination shell of the central Fe atom in the Fe-Pd/chitosan samples certifies the binding of the Fe metal particles with the chitosan surface via OH and NH(2) groups. The samples are characterized by the high stability of the nanoparticles as compared to unstabilized Pd-NZVI. The materials were tested to evaluate their catalytic activity in the perchloroethene (PCE) dechlorination reaction. Some samples of chitosan-stabilized Pd-NZVI revealed a good performance in PCE degradation as compared to unstabilized Pd-NZVI.
已经制备了一系列壳聚糖稳定的 Pd-NZVI（纳米零价铁）催化剂，其组成和聚合物的性质有所变化。优化了合成程序和钯和壳聚糖的含量。XPS 方法表明，Fe-Pd/壳聚糖样品中的 Fe 和 Pd 以金属态存在。与体相金属相比，结合能的正位移表明表面层中的铁金属以非常小的纳米颗粒形式存在。还通过 XAS 方法对制备的材料进行了表征。在 Fe-Pd/壳聚糖样品中中心 Fe 原子的第一配体壳层中存在 O 和 N 原子，证明了 Fe 金属颗粒通过 OH 和 NH2 基团与壳聚糖表面结合。与未稳定的 Pd-NZVI 相比，这些样品的纳米颗粒具有很高的稳定性。测试了这些材料在全氯乙烯（PCE）脱氯反应中的催化活性。与未稳定的 Pd-NZVI 相比，一些壳聚糖稳定的 Pd-NZVI 样品在 PCE 降解方面表现出良好的性能。
