Efficient removal of uranium from aqueous solution by zero-valent iron nanoparticle and its graphene composite

Journal of Hazardous Materials
Zi-Jie LiWei-Qun Shi

Abstract

Zero-valent iron nanoparticle (ZVI-np) and its graphene composites were prepared and applied in the removal of uranium under anoxic conditions. It was found that solutions containing 24 ppm U(VI) could be completely cleaned up by ZVI-nps, regardless of the presence of NaHCO3, humic acid, mimic groundwater constituents or the change of solution pH from 5 to 9, manifesting the promising potential of this reactive material in permeable reactive barrier (PRB) to remediate uranium-contaminated groundwater. In the measurement of maximum sorption capacity, removal efficiency of uranium kept at 100% until C0(U) = 643 ppm, and the saturation sorption of 8173 mg U/g ZVI-nps was achieved at C0(U) = 714 ppm. In addition, reaction mechanisms were clarified based on the results of SEM, XRD, XANES, and chemical leaching in (NH4)2CO3 solution. Partially reductive precipitation of U(VI) as U3O7 was prevalent when sufficient iron was available; nevertheless, hydrolysis precipitation of U(VI) on surface would be predominant as iron got insufficient, characterized by releases of Fe(2+) ions. The dissolution of Fe(0) cores was assigned to be the driving force of continuous formation of U(VI) (hydr)oxide. The incorporation of graphene supporting mat...Continue Reading

References

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Citations

Feb 7, 2016·Environmental Science and Pollution Research International·Hamid Rashidi NodehMohd Marsin Sanagi
Apr 10, 2016·Aquatic Toxicology·C Y P NgK N Yu
Apr 27, 2016·Journal of Colloid and Interface Science·Min Xing, Jianlong Wang
Jul 17, 2016·Journal of Environmental Radioactivity·C JingS Landsberger
Oct 11, 2016·The Science of the Total Environment·Anwei ChenHongli Huang
Feb 27, 2016·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Xiangxue WangXiangke Wang
Jun 30, 2018·International Journal of Environmental Research and Public Health·Yanhua WangXiaoping Li
Mar 24, 2017·Nanoscale Research Letters·Nataliya PerlovaValentina Sazonova
Aug 12, 2019·Environmental Science and Pollution Research International·Min XingJianlong Wang
Dec 20, 2019·Environmental Science and Pollution Research International·Shuibo XieQi Fang
Oct 10, 2020·Global Challenges·Brian J Riley, Saehwa Chong
Sep 30, 2020·Journal of Environmental Radioactivity·Fahim Hossain
Aug 5, 2021·Archives of Environmental Contamination and Toxicology·Anita PuniaPankaj Kumar
Aug 29, 2018·Environmental Science & Technology·Lin WangWeiqun Shi
May 30, 2019·ACS Applied Materials & Interfaces·Lin XuShuao Wang

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