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Frontiers in Energy

Front. Energy    2020, Vol. 14 Issue (1) : 11-17     https://doi.org/10.1007/s11708-019-0634-y
RESEARCH ARTICLE
An adsorption study of 99Tc using nanoscale zero-valent iron supported on D001 resin
Lingxiao FU1, Jianhua ZU1(), Linfeng HE2, Enxi GU1, Huan WANG1
1. School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
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Abstract

Nanoscale zero-valent iron (nZVI) supported on D001 resin (D001-nZVI) was synthesized for adsorption of high solubility and mobility radionuclide 99Tc. Re(VII), a chemical substitute for 99Tc, was utilized in batch experiments to investigate the feasibility and adsorption mechanism toward Tc(VII). Factors (pH, resin dose) affecting Re(VII) adsorption were studied. The high adsorption efficiency of Re(VII) at pH= 3 and the solid-liquid ratio of 20 g/L. X-ray diffraction patterns revealed the reduction of ReO4 into ReO2 immobilized in D001-nZVI. Based on the optimum conditions of Re(VII) adsorption, the removal experiments of Tc(VII) were conducted where the adsorption efficiency of Tc(VII) can reach 94%. Column experiments showed that the Thomas model gave a good fit to the adsorption process of Re(VII) and the maximum dynamic adsorption capacity was 0.2910 mg/g.

Keywords technetium      nanoscale zero-valent iron (nZVI)      D001 resin      adsorption     
Corresponding Authors: Jianhua ZU   
Online First Date: 01 July 2019    Issue Date: 16 March 2020
 Cite this article:   
Lingxiao FU,Jianhua ZU,Linfeng HE, et al. An adsorption study of 99Tc using nanoscale zero-valent iron supported on D001 resin[J]. Front. Energy, 2020, 14(1): 11-17.
 URL:  
http://journal.hep.com.cn/fie/EN/10.1007/s11708-019-0634-y
http://journal.hep.com.cn/fie/EN/Y2020/V14/I1/11
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Lingxiao FU
Jianhua ZU
Linfeng HE
Enxi GU
Huan WANG
Fig.1  Schematic illustration of the liquid reduction method by NaBH4
Fig.2  SEM images of D001 resin and D001-nZVI
Fig.3  Fe element distribution of D001-nZVI
Fig.4  XRD pattern of D001-nZVI and Re(VII)-loaded D001-nZVI
Fig.5  Effect of pH on removal of Re(VII)
Fig.6  Effect of resin dose on removal of Re(VII)
Fig.7  Fit curve of pseudo-first-order kinetic model for adsorption of Re(VII)
Fig.8  Fit curve of pseudo-second-order kinetic model for adsorption of Re(VII)
Pseudo-first-order Pseudo-second-order
k1/(min-1) R2 k2/(g?mg-1?min-1) R2
0.00461 0.9740 0.012 0.9968
Tab.1  Parameters of kinetic models for adsorption of Re(VII)
Fig.9  Removal efficiency of Tc(VII) on D001-nZVIat different pH values (Initial activity of TcO4: 370 Bq/mL, resin amount: 10 g/L)
Fig.10  Removal efficiency of Tc(VII) on D001-nZVI at different resin doses (Initial activity of TcO4: 370 Bq/mL, initial pH: 3)
Fig.11  Breakthrough curve for adsorption of Re(VII)
Fig.12  Thomas model for continuous adsorption of Re(VII)
Metal ion Regression equation kT/(mL?min−1?mg−1) q0/(mg?g−1) R2
Re(VII) ln?( C0C e1)=1.31813.933V 0.4170 0.2910 0.991
Tab.2  Thomas model equation and parameters for adsorption of Re(VII)
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