An adsorption study of <sup>99</sup>Tc using nanoscale zero-valent iron supported on D001 resin

doi:10.1007/s11708-019-0634-y

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 $Re O 4 −$ 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 Author(s): 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:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-019-0634-y
https://academic.hep.com.cn/fie/EN/Y2020/V14/I1/11

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)

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

TcO 4 −

: 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

TcO 4 −

: 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	k_T/(mL?min⁻¹?mg⁻¹)	q₀/(mg?g⁻¹)	R²
Re(VII)	$ln ? (C 0 C e − 1) = 1.318 − 13.933 V$	0.4170	0.2910	0.991

Tab.2 Thomas model equation and parameters for adsorption of Re(VII)

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