摘要：Nano zero valent iron (nZVI), nano palladium- iron bimetallic (Pd/Fe), nZVI stabilized with carbox- ymethyl cellulose (CMC) (CMC-Fe), and Pd/Fe modified with CMC (CMC-Pd/Fe) were prepared by liquid phase reduction method, and characterized by scanning electron microscopy (SEM). The sedimentation and transport experiments of the four kind of nano particles in porous media were conducted to investigate the dispersion of the materials. The effects of different nano-iron, nano-iron concentration, amount of CMC modification, grain size, and flow rate of injection on nano irons transport were investigated by column experiment. The results show that the particle size of nano particles modified by CMC gets smaller, and the degree of dispersion is improved. The catalyst Pd has little effect on the sedimentation of nano-iron. Under the same conditions, the transport of nZVI and Pd/Fe modified with CMC in the porous medium is obviously better than that of nZVI and Pd/Fe, while the difference of transport between CMC-Fe and CMC-Pd/Fe is not significant. With increase of the nano-iron concentration, the amount of CMC modification, the particle size of the medium and the flow rate, the transport of the modified nano-iron in the medium increases.
