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Dication-accelerated anion transport inside micropores for the rapid decontamination of pertechnetate

Nuclear Science and Techniques 2022年第4期33卷 19-32页

作者： Peng Zhang Yi-Zhi Chen Han-Qin Weng Zi-Fang Guo Jia-Liang Chen Xing Zhao Guo-An Ye Ming-Zhang Lin School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Department of Beam Material Science SANKENThe Institute of Scientific and Industrial ResearchOsaka University8-1 MihogaokaIbarakiOsaka 567-0047Japan Radiochemistry Department of China Institute of Atomic Energy China Institute of Atomic EnergyBeijing 102413China

Over 70%of the treated contaminated water at the Fukushima Daiichi Nuclear Power Station contains radionuclides beyond the regulatory standard for discharge that need to be re-purified.Technetium-99(^(99)Tc),mainly in the form of pertechnetate Tc(VII)O_(4)^(-),is one of the main sources of long-term radiotoxicity that jeopardizes the environment and human health.Herein,we used a series of dicationic pyridinium(DCP)derivative groups(–Py^(+)C_(n)H_(2n)N^(+)Me_(3),n=2,3,and 5)to modify commercial Reillex 425 resins containing tertiary pyridyl groups to improve the adsorption performance of rhenium(Re,an analog of radioactive Tc)and Tc.As the quaternary pyridinium and ammonium sites in one DCP group can adsorb ReO_(4)^(-) simultaneously,DCP-modified Reillex 425(Reillex-Cn)exhibited high maximum adsorption capacities for Re under neutral conditions.Adsorption capacities reached 344.8,416.7,and 588.2 mg g^(-)1 for Reillex 425-C2,Reillex 425-C3,and Reillex 425-C5,respectively.Intraparticle diffusion of ReO_(4)^(-)/TcO_(4)^(-) in Reillex 425-Cn was verified to be the rate-limiting step of adsorption.However,adsorption can be adjusted by the length of the alkyl spacers between the two positively charged N sites in DCP.–Py^(+)C_(2)H_(4)N^(+)Me_(3) significantly enhanced intraparticle diffusion compared to–Py^(+)C_(5)H_(10)N^(+)Me_(3).The two positive sites in–Py^(+)C_(2)H_(4)N^(+)Me_(3) would be laterally distributed,leading to a smaller steric hindrance for ReO_(4)–/TcO_(4)^(-) transport inside the microporous channels.Meanwhile,the longer alkyl spacers in–Py^(+)C_(5)H_(10)N^(+)Me_(3) formed hydrophobic microphases,repulsing the hydrated ReO_(4)–/TcO_(4)^(-) anions.Thus,the adsorptions of both ReO_(4)^(-) and TcO_(4)^(-) on Reillex 425-C2 were faster than those on Reillex 425-C5.Moreover,Reillex 425-Cn exhibited an exothermic nature,good selectivity,excellent reusability,and strong salinity tolerance.This study provides a simple strategy to enhance the Tc removal performance of adsorbents containing abundant micropores,wh

关键词： Quaternary pyridinium Dicationic pyridyl derivatives pertechnetate Intraparticle diffusion

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SCINTIGRAPHIC DETECTION FOR ECTOPIC GASTRIC MUCOSA WITH TECHNETIUM-99m pertechnetate

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Journal of Pharmaceutical Analysis 1997年第1期11卷 19-22页

作者：孙步洲宋厂义姚正生王社教李恭才顾建章孙建中詹祯祥 Department of Neclear Medicine Second Affiliated Hospital Xi'an Medical University Xi'an 710004 China

58 children with gastrointestinal bleeding were examined for ectopic gastric mucosa with 99m Tc-pertechnetate. 25 cases who had abnormal uptake in 1 hour were diagnosed positive and among them 17 cases were operated on and final pathology diagnoses were made- The results showed that 5cases were Meckel's diverticulum, 8 alimentary duplication aberrations and 4 false positive inclusive of 1 enteric hemangioma and 1 enteric telangiectasia. From the results, duplications were more than Meckel's diverticulum which contained gastric mucosa. False positive can be avoided by using the early uptake phase and twice image in the first hour as diagnostic standard except enteric hemangioma and enteric teiangiectasia.

关键词： Meckel's diverticulum gastrointestinal duplication ectopic gastric mucosa pertechnetate

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Temperature-responsive alkaline aqueous biphasic system for radioactive wastewater treatment

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Chinese Chemical Letters 2022年第7期33卷 3561-3564页

作者： Chuanying Liu Jianhui Lan Qibin Yan Zhipeng Wang Chao Xu Weiqun Shi Chengliang Xiao College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027China Institute of Zhejiang University–Quzhou Quzhou 324000China Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Institute of Nuclear&New Energy Technology Tsinghua UniversityBeijing 100084China

The treatment of anionic ^(99)TcO_(4)^(-)in the waste tank with high alkalinity is still very challenging.In this work,a new temperature-responsive alkaline aqueous biphasic system(ABS)based on(tri-n–butyl)-ntetradecyl phosphonium chloride(P_(44414)Cl)was developed to remove radioactive ^(99)TcO_(4)^(-).The phase transition mechanism was studied by cloud point titration,small-angel X-ray scattering,dynamic light scattering,and molecular dynamic simulations.As the Na OH concentration or temperature increased,the P_(44414)^(+)micelle could grow and aggregate.This micelle showed a particularly high affinity toward ReO_(4)^(-)/^(99)TcO_(4)^(-)compared to other competing anions and could directly extract more than 98.6%of ^(99)TcO_(4)^(-)from simulated radioactive tank waste supernatant.Furthermore,the loaded ^(99)TcO_(4)^(-)could be easily stripped by using concentrated nitric acid rather than metal salt-based reductants.This work clearly demonstrates that the alkaline ABS is a promising separation system for solving the technetium problem in the alkaline waste tank.

关键词： pertechnetate Ionic liquid Nuclear waste Aqueous biphasic system Sustainable chemistry

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Removal of pertechnetate (99TcO4-) from Liquid Waste by Magnesium Ferrite (MgFe2O4) Nanoparticles Synthesized Using Sol-Gel Auto Combustion Method

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Open Journal of Applied Sciences 2019年第2期9卷 68-86页

作者： W.M.Abdellah A.Ezzat I.Samir Radiation Protection Department Nuclear and Radiological Regulatory AuthorityCairoEgypt Chemistry Department Faculty of ScienceAin Shams UniversityCairoEgypt Central Laboratories Nuclear and Radiological Regulatory AuthorityCairoEgypt

Low-cost adsorbents, Magnesium ferrite (MgFe2O4) nanoparticles were synthesized using three different types of fuel such as Urea, Oxalic acid, and Citric acid via sol-gel auto-combustion method. The prepared products were characterized by means of powder X-Ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FT-IR) and Field Emission Scanning Electron Microscope (FE-SEM). The influence of the fuel used on the morphology and the crystallite size of MgFe2O4 Nano products were studied. The results showed that Citric acid fuel produced pure MgFe2O4 with the smallest crystallite size average cluster = 13.53 nm. The synthesized sample was used for the removal of 99TcO4- anions from low level liquid waste under studied conditions. The different parameters affecting on the adsorption process using the batch method were studied. The results revealed that MgFe2O4 nanostructure has high removal ability of 99TcO4- from aqueous solutions (98.84%). The adsorption data are in good agreement with Freundlich and Pseudo second order isotherm models. The adsorption process was a chemisorption reaction additionally, the results of the thermodynamic parameters indicated that the adsorption of 99TcO4- on nanostructures was an exothermic and spontaneous process.

关键词： Magnesium Ferrite Nanoparticles Sol-Gel Auto Combustion Adsorption pertechnetate Low Level Radioactive Waste

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Rational design of a cationic polymer network towards record high uptake of ^(99)TcO_(4)^(-)in nuclear waste

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Science China Chemistry 2021年第7期64卷 1251-1260页

作者： Jie Li Long Chen Nannan Shen Rongzhen Xie Matthew VSheridan Xijian Chen Daopeng Sheng Duo Zhang Zhifang Chai Shuao Wang State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064China

^(99)Tc is a long-lived radionuclide present in large amounts as TcO_(4)^(-)-anion in used nuclear fuel.Its removal from the waste stream is highly desirable because of its interference capability with actinide separation and its volatile nature during the nuclear waste vitrification process.Despite the progress achieved in the past few years,the design of anion-exchange materials with optimized Tc uptake property and improved stability under the extreme condition is still a research goal beneficial for reducing the volume of secondary radioactive solid waste generated during the waste partitioning process.However,their design philosophy remains elusive,with challenges coming from charge repulsion,steric hindrance,and insufficient reactive sites within the materials.Herein,we present a design philosophy of cationic polymer network materials for TcO_(4)^(-)separation by systematic precursor screening and structure prediction.This affords an optimized material,SCU-CPN-2(SCU=Soochow University),with extremely high positive charge density while maintaining high radiation resistance.SCU-CPN-2 exhibits a record high adsorption capacity1,467 mg/g towards the surrogate ReO_(4)^(-)compared to all anion-exchange materials reported up to date.In addition to ultrafast adsorption kinetics,SCU-CPN-2 has remarkable selectivity over nitrate and sulfate,and facile recyclability.

关键词： pertechnetate perrhenate adsorption adsorption capacity cationic organic polymer

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Ileal duplication mimicking intestinal intussusception:A congenital condition rarely reported in adult

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World Journal of Gastroenterology 2013年第38期19卷 6500-6504页

作者： Bing-Lu Li Xin Huang Chao-Ji Zheng Jiao-Lin Zhou Yu-Pei Zhao The First Department of General Surgery Peking Union Medical College Hospital

Intestinal duplication is an uncommon congenital condition in young adults.A 25-year-old man complained of chronic,intermittent abdominal pain for 3 years following previous appendectomy for the treatment of suspected appendicitis.Abdominal discomfort and pain,suggestive of intestinal obstruction,recurred after operation.A tubular mass was palpable in the right lower quadrant.Computed tomography enterography scan identified suspicious intestinal intussusception,while Tc-99m pertechnetate scintigraphy revealed a cluster of strip-like abnormal radioactivity in the right lower quadrant.On exploratory laparotomy,a tubular-shaped ileal duplication cyst was found arising from the mesenteric margin of the native ileal segment located 15 cm proximal to the ileocecal valve.Ileectomy was performed along with the removal of the duplication disease,and the end-to-end anastomosis was done to restore the gastrointestinal tract continuity.Pathological examination showed ileal duplication with ectopic gastric mucosa.The patient experienced an eventless postoperative recovery and remained asymptomatic within 2 years of postoperative follow-up.

关键词： Ileal duplication cyst Adulthood Computed tomography enterography Tc-99m pertechnetate scintigraphy

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