期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 280, 期 -, 页码 399-408出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.08.023
关键词
Nanoscale zerovalent iron; Reduced graphene oxide nanosheets; Sorption and reduction; Radionuclides; Spectroscopic techniques
资金
- Anhui Provincial National Science Foundation [1408085MB28]
- National Natural Science Foundation of China [21207135, 21225730, 91326202, 91126020]
- 973 projects from MOST of China [2011CB933700]
- Hefei Center for Physical Science and Technology [2012FXZY005]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions
The reduced graphene oxide-supported nanoscale zero-valent iron (nZVI/rGO) composites were synthesized by chemical deposition method and were characterized by SEM, high resolution TEM, Raman and potentiometric acid-base titrations. The characteristic results showed that the nZVI nanoparticles can be uniformly dispersed on the surface of rGO. The removal of U(VI) on nZVI/rGO composites as a function of contact time, pH and U(VI) initial concentration was investigated by batch technique. The removal kinetics of U(VI) on nZVI and nZVI/rGO were well simulated by a pseudo-first-order kinetic model and pseudo-second-order kinetic model, respectively. The presence of rGO on nZVI nanoparticles increased the reaction rate and removal capacity of U(VI) significantly, which was attributed to the chemisorbed OH- groups of rGO and the massive enrichment of Fe2+ on rGO surface by XPS analysis. The XRD analysis revealed that the presence of rGO retarded the transformation of iron corrosion products from magnetite/maghemite to lepidocrocite. According to the fitting of EXAFS spectra, the U-C (at similar to 2.9 angstrom) and U-Fe (at similar to 3.2 angstrom) shells were observed, indicating the formation of inner-sphere surface complexes on nZVI/rGO composites. Therefore, the nZVI/rGO composites can be suitable as efficient materials for the in-situ remediation of uranium-contaminated groundwater in the environmental pollution management. (C) 2014 Elsevier B.V. All rights reserved.
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