JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 321
·期 1
·235-242
·
IF 1.186
Zu Jianhua,Fu Lingxiao,Tang Fangdong,He Linfeng
A new pyridyl anion exchange resin (PS-N) was synthesized by chloroacetylation and quaternization on the polystyrene-divinylbenzene microspheres (PS) and was characterized by FT-IR, TGA, and X-ray photoelectron spectroscopy. PS-N was applied to study the removal of Re(VII), a chemical analogue of 99 Tc, to investigate the effect of solution acidity, resin dose and contact time on the adsorption efficiency. The adsorption process corresponded with the Langmuir isotherm model and matches well with pseudo-second-order kinetics. Based on the adsorption results of Re(VII), the adsorption efficiency of 99 Tc was examined to be 99.5% at optimum conditions.
研究领域:
环境科学
·
核化学与放射化学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 2
·399-407
·
IF 1.6
Zu Jianhua,Pan Xiaohan,Han Gang,Xue Yi,Diao Jingjie,Liu Siyu
A novel resin (PS-TMMA) with double functional groups exhibited high adsorption selectivity toward 99 TcO 4 − from the coexisting fission products (Sr, Eu, Dy, Cs) in 0.1–1 mol/L HCl. On the contrary, in neutral medium K d of PS-TMMA resin towards lanthanide elements was much higher than Tc. The results of column chromatography showed that light lanthanide was firstly penetrated on the column. Using 0.01 mol/L 2-hydroxyisobutyric acid as eluent, the adsorbed lanthanides could be effectively eluted at pH 3.03, and the light and heavy lanthanides were partially separated in effluents.
研究领域:
放射化学
·
分离科学
·
核化学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Juan Tong,Tianhao Dong,Chen Du,Tonghuan Liu,Keliang Shi,Junqiang Yang,Xiaolin Hou
The separation and measurement of 99 Tc are independent of each other and the enrichment, which leads to the further extension of the whole analysis process and the increasing potential radiation received by the operator. Plastic scintillation resins (PSresin) are novel materials used to separate, preconcentrate and measure radionuclides in a single step. Herein, a plastic scintillation resin Tc-PSresin was prepared, which exhibited fast removal kinetics (1 h) and high capacity (32.89 mg g −1 for ReO 4 - , surrogate of TcO 4 - ) and almost not interfered by coexisting ions. In addition, the adsorption capacity, adsorption kinetics and detection efficiency of Tc-PSresin were compared with the commercial TK-TcScint scintillation resin produced by Triskem company. The results showed that the adsorption capacity of Tc-PSresin is 144% than that of TK-TcScint resin, and the equilibrium time of commercial resin was 12 h, which was much longer than that of Tc-PSresin under the same conditions. The detection efficiency of Tc-PSresin for Tc(VII) is higher than that of TK-TcScint resin, indicating that Tc-PSresin has great application potential for the enrichment and measurement of Tc(VII).
研究领域:
化学
·
环境科学
·
核技术应用
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DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jiang Liu,Zhaoheng Zhu,Yukun Huang,Long Wang,Kai Jia
There is a critical need to develop cost-effective and efficient adsorption materials for the removal of technetium-99 (99Tc) from contaminated water sources. This research presents the synthesis of amino-modified cellulose microspheres (CM-APTS) through the addition of 3-amino-propyl triethoxysilane (APTS) to regenerated cellulose microspheres (CM), followed by a subsequent reaction with ethylene dibromide (EDB) to produce halogen-modified amino cellulose microspheres (CM-APTS-EDB). These are engineered for the effective absorption of ReO4–, serving as a chemical surrogate for TcO4–. By altering the amount of ethylene dibromide used, two variations of bromine-modified cellulose microspheres, CM-APTS-EDBs and CM-APTS-EDBe, are synthesized. Among these, CM-APTS-EDBe exhibits robust adsorption capabilities for ReO4– across a pH spectrum of 2.5–10, attaining a peak capacity of 281 mg·g–1, and demonstrates selective adsorption of ReO4– even in the presence of competing anions such as NO3–, Cl–, and SO42–. Characterization through X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) indicates that the adsorption mechanism predominantly involves interactions between ReO4– and N+, hydrogen bonding with amino hydrogen, and σ-hole-anion interactions between Re–O and C–Br. After eight adsorption–desorption cycles, CM-APTS-EDBe retains notable stability and reusability. Additionally, the material efficiently captures ReO4– from simulated Hanford Low Activity Waste (LAW) wastewater, achieving an adsorption efficiency of 77.26% at a solid–liquid ratio of 40 g·L–1. This investigation underlines the potential of halogenated regenerated cellulose microspheres in designing advanced adsorbents for the removal of radioactive pollutants like TcO4–/ReO4–, offering a strategy for environmental remediation efforts.
研究领域:
环境科学
·
放射化学
·
材料科学
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高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2019
·Vol. 34
·期 11
·2229-2235
·
IF 3.646
Lei Tang,Wenting Bu,Xuemei Liu,Sheng Hu
The accurate determination of ultra-trace amounts of 99Tc is still a challenge due to its long half-life and the lack of a commercially available isotopic tracer. Negative thermal ionization mass spectrometry (N-TIMS) has been proven to be a powerful method for the analysis of isotopes with relatively high ionization potentials. In this work, we established a novel method based on N-TIMS for the measurement of Tc isotopes. By using Pt filaments and Ba(OH)2 as the ionization activator, the ionization efficiency of Tc was significantly improved to be more than 10%. The oxygen isotopic compositions were measured with a 99Tc standard solution and the obtained coefficients can be applied directly for the correction of interferences from oxygen isotopes. We used this method for the measurement of the isotopic abundance and concentration of the 97Tc tracer produced in our laboratory. Due to the high ionization efficiency of this method and the calibration of the 97Tc tracer, ultra-trace determination of 99Tc in radioactive wastes and environmental samples is now possible.
研究领域:
分析化学
·
环境科学
·
放射化学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 328
·期 1
·481-490
·
IF 1.371
Fu Lingxiao,Pan Xiaohan,Zu Jianhua,He Linfeng
N , N , N ′, N ′-tetramethylmalonamide (TMMA) has been successfully grafted onto the chloroacetylated poly(styrene-co-divinylbenzene) resin to obtain a novel diamide-based resin (PS–TMMA). PS–TMMA exhibited high adsorption capacity and selectivity toward TcO 4 − in 0.1–1 M HCl. The adsorption process of PS–TMMA conforms (Revise: conformed) to Langmuir isotherm and pseudo-second-order kinetics model. The results of column experiments revealed TcO 4 − can be completely separated from the coexisting fission products (Sr(II), Eu(III), Dy(III), and 1 M NH 3 ·H 2 O can re-collect TcO 4 − absorbed in the resin column. The adsorption mechanism of TcO 4 − is considered that PS–TMMA is converted into anion exchange resin in acidic condition.
研究领域:
化学工程
·
核化学与放射化学
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·Vol. 60
·期 33
·23438-23449
·
IF 12.2
She Jingye,Kang Mingliang,Jin Wujian,Weng Hanqin,Qin Danwen,Gu Zhixing
Reductive immobilization of 99 Tc(VII) to sparingly
soluble
TcO 2 -type phases is a key process limiting 99 Tc transport in the environment. However, the reactivity of natural
pyrite toward 99 Tc(VII) under conditions relevant to nuclear
waste repositories remains poorly understood. Here, we investigate
the interactions of 99 Tc(VII) and its nonradioactive congener
Re(VII) with natural pyrite under γ-irradiation (0–100
kGy; 0–100 Gy/min). In the absence of γ-irradiation,
natural pyrite exhibited limited reactivity toward 99 Tc(VII)
at circumneutral to alkaline pH over the investigated time scales.
Under γ-irradiation, however, pyrite-mediated reductive sequestration
of both Tc(VII) and Re(VII) was substantially enhanced, producing
a TcO 2 /TcO x -TcS x mixture and ReO 2 as dominant reduction
products. Mechanistic analyses indicate that radiolytically generated
hydrated electrons (e aq – ) and hydrogen
radicals (·H) directly reduce TcO 4 – and ReO 4 – , while pyrite and dissolved
Fe 2+ scavenge hydroxyl radicals (·OH) and sustain
a reducing interfacial environment. Under acidic conditions, protonation
of e aq – to ·H limits Tc(VII)/Re(VII)
reduction efficiency. At higher pH, OH – suppresses
intermediate disproportionation, promoting efficient stepwise reduction
via consecutive one-electron transfer from e aq – . These findings demonstrate that γ-irradiation fundamentally
alters the redox reactivity of natural pyrite and promotes radionuclide
immobilization under nuclear waste repository conditions, providing
critical constraints for predicting long-term radionuclide transport
in deep geological disposal systems.
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PubMed
高影响因子
Materials
·
2026
·Vol. 19
·期 13
·2835
·
IF 3.7
Yunfeng Shi,Song Yang,Hanhan Liu,Zhou Li,Longjiang Wang,Jun Tan,Weijie Chen,Ting Wang,Aiming Zhang,Bing Lian
To address the issue of radioactive waste generated by the large-scale promotion and use of nuclear energy, safety evaluations of disposal sites in various surrounding rocks are essential. These evaluations are a prerequisite for ensuring the long-term safe disposal of radioactive waste. This study focuses on the blocking capacity of clay rocks concerning the advection–dispersion behavior of representative radionuclides such as137Cs,79Se, and99Tc. It further examines the effects of competitive adsorption that arise when these three radionuclides coexist. (Since79Se is difficult to obtain,75Se was used as a substitute nuclide. In the mixed-nuclide experiments, the stable isotope Re was used to replace99Tc.) The experimental findings revealed that competitive adsorption can significantly reduce the adsorption capability of clay rocks for137Cs and79Se, altering the adsorption mechanism. During the advection–dispersion process, the weak adsorption sites of137Cs and79Se on clay rocks become active after the strong adsorption sites are preferentially occupied, resulting in a decline in both adsorption quantity and rate. In the case of99Tc, competitive adsorption weakens the effect of anion repulsion, leading to a reduction in the immobile liquid regions (θim).
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高影响因子
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