Citation: Ji Haodong, Zhu Yangmo, Duan Jun, Liu Wen, Zhao Dongye. Reductive immobilization and long-term remobilization of radioactive pertechnetate using bio-macromolecules stabilized zero valent iron nanoparticles[J]. Chinese Chemical Letters, ;2019, 30(12): 2163-2168. doi: 10.1016/j.cclet.2019.06.004 shu

Reductive immobilization and long-term remobilization of radioactive pertechnetate using bio-macromolecules stabilized zero valent iron nanoparticles

Ji Haodong ^a,b ,
Zhu Yangmo ^b ,
Duan Jun ^b ,
Liu Wen ^a,c,*, ,
Zhao Dongye ^b,d,**,

a.
The Key Laboratory of Water and Sediment Science, Ministry of Education, College of Environment Science and Engineering, Peking University, Beijing 100871, China
b.
Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, AL 36849, United States
c.
The Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT), Peking University, Beijing 100871, China
d.
Institute of Environmental Science, Taiyuan University of Science and Technology, Taiyuan 030024, China

^**

wen.liu@pku.edu.cn

ZHAODON@auburn.edu

Received Date: 12 April 2019
Revised Date: 2 June 2019
Accepted Date: 4 June 2019
Available Online: 4 December 2019

Figures(5)

Reductive immobilization of radioactive pertechnetate (⁹⁹TcO₄^-) in simulated groundwater was studied by prepared carboxymethyl cellulose (CMC) and starch stabilized zero valent iron nanoparticles (nZVI), and long-term remobilization of reduced Tc was also evaluated under anoxic and oxic conditions. The stabilized nZVI can effectively reduce soluble ⁹⁹Tc(Ⅶ) to insoluble ⁹⁹Tc(Ⅳ), and they can be easily delivered into a contaminated groundwater zone and facilitate in situ remediation. In this study, CMC-stabilized nZVI showed higher reactivity than that using starch as the stabilizer. Batch experiments indicated that more than 99% of ⁹⁹Tc(Ⅶ) (C₀=12 mg/mL) was reduced and removed from groundwater by CMC-stabilized nZVI with a CMC content of 0.2% (w/w) at a broad pH of 5-8. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses further confirmed that ⁹⁹Tc(Ⅶ)O₄^- transformed into ⁹⁹Tc(Ⅳ)O₂ (s). The presence of bicarbonate exhibited insignificant effect on Tc immobilization, while humic acid (HA) inhibited reaction mainly due to retardation on electron transfer and formation of Tc(Ⅳ)-HA complexes. More interesting, the immobilized Tc(Ⅳ) remained insoluble even after 120 d under anoxic condition, while only~21% was remobilized when exposed to air. Therefore, biomacromolecules stabilized nZVI nanoparticles could be a viable alternative for in situ remediation of radioactive contamination in groundwater.
- Reductive immobilization,
- Radionuclide,
- Stabilized nanoparticles,
- Zero valent iron,
- Groundwater,
- Technetium
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