Abstract
The feasibility for removal of Cr species from contaminated groundwater by adsorption onto the Fe(0) nanoparticles has been studied in the present work. Experimentally, the efficiency for removal of Cr(III or VI) was >99.9 % in the range of 1000-15000 mg/L. The morphology and particle size distribution of Fe(0) nanoparticles were confirmed by XRD, FE-SEM/EDS and TEM. By XANES, it was found that mainly Cr(III) with a small amount of Cr(0) was adsorbed on the Fe(0) nanoparticles. This work exemplifies the utilization of XANES/EXAFS and FE-SEM/EDS to reveal the speciation and possible reaction pathway in a very complex adsorption process in detail. It is also very clear that adsorptive decontamination of Cr species via the in-situ remediation by using a reactive permeable barrier of Fe(0) nanoparticles would be environmentally attractive in the future.
