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Visualized uranium rapid monitoring system based on self-enhanced electrochemiluminescence-imaging of amidoxime functionalized polymer nanoparticles

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Chinese Chemical Letters 2022年第7期33卷 3456-3460页

作者： Ziyu Wang Hang Gao Peng Liu Xinqi Wu Qian Li Jing-Juan Xu Daoben Hua State Key Laboratory of Radiation Medicine and Protection School for Radiological and Interdisciplinary Sciences(RAD-X)Soochow UniversitySuzhou 215123 China State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions Soochow UniversitySuzhou 215123China

The development of uranyl ion detection technology has exhibited its significance in public security and environmental fields for the radioactivity and chemical toxicity of uranyl ion.The WHO standard of uranyl ion makes it necessary to develop highly sensitive uranyl rapid warning system in drinking water monitoring.Herein,a visualized rapid warning system for trace uranyl ion is carried out based on electrochemiluminescence(ECL) imaging technology to give an ultra-low limit of detection(LOD) and high selectivity.amidoxime,a bi-functional group with both uranyl ion capturing and co-reactive functions,is modified on a conjugated polymer backbone with strong ECL signal to be prepared into three-in-one polymer nanoparticles(PNPs) with self-enhanced ECL property.The captured uranyl ion can enhance the ECL signal of PNPs via resonance energy transfer process to give the LOD as 0.5 ng/L,which is much lower than the known luminescent uranyl sensors.Furthermore,ECL imaging technology is introduced into realizing visualized uranyl rapid warning,and can be successfully applied on natural water samples.This study provides a novel strategy for uranyl rapid warning,and shows its potential meaning in public security and environmental fields.

关键词： Visualized monitoring Electrochemiluminescence amidoxime Uranium Public security

amidoxime-based adsorbents prepared by cografting acrylic acid with acrylonitrile onto HDPE fiber for the recovery of uranium from seawater

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Nuclear Science and Techniques 2017年第4期28卷 13-18页

作者： Lu Xu Jiang-Tao Hu Hong-Juan Ma Chang-Jian Ling Mou-Hua Wang Rong-Fang Shen Xiao-Jing Guo Yin-Ning Wang Jing-Ye Li Guo-Zhong Wu Shanghai Institute of Applied Physics Chinese Academy of Sciences Nuclear and Radiation Safety Center Ministry of Environmental Protection of the People's Republic of China

An amidoxime-based polymeric adsorbent was prepared by pre-irradiation grafting of acrylonitrile and acrylic acid onto high-density polyethylene fibers using electron beams,followed by amidoximation.Quantitative recovery of uranium was investigated by flow-through experiment using simulated seawater and marine test in natural seawater.The maximum amount of uranium uptake was 2.51 mg/g-ads after 42 days of contact with simulated seawater and 0.13 mg/g-ads for 15 days of contact with natural seawater.A lower uranium uptake in marine test can be attributed to the short adsorption time and the contamination of marine microorganisms and iron.However,the high selectivity toward uranium against vanadium may be beneficial to harvest uranyl ion onto adsorbents and the economic feasibility for recovery of uranium from seawater.

关键词： Radiation-induced grafting amidoxime Acrylonitrile Uranium Selectivity

Decorating Covalent Organic Frameworks with High-density Chelate Groups for Uranium Extraction

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Chemical Research in Chinese Universities 2022年第2期38卷 433-439页

作者： QIN Xudong TANG Xiaohui MA Yu XU Hong XU Qing YANG Weiting GU Cheng State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhou 510640P.R.China Key Laboratory of Advanced Materials of Tropical Island Resources Ministry of EductionSchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228P.R.China CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research Institute(SARI)Chinese Academy of Sciences(CAS)Shanghai 201210P.R.China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084P.R.China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhou 510640P.R.China

The extraction of uranium from aqueous solution is highly desirable for sustaining the increasing demand for environmental safety and nuclear fuel.Herein,we report a strategy using a two-step covalent modification for the synthesis of covalent organic frameworks(COFs)with high-density amidoxime chelate groups at periphery.The introduction of dense amidoxime groups plays a pivotal role in uranium adsorption.The resulting COF exhibits strong affinity with the distribution coefficient of 5.2×104 mL/g and a high adsorption capacity of 319.9 mg/g.The strategy could be expanded to identify and remove different contaminants by introducing special functional groups.

关键词： Two-step post-synthetic modification High-density amidoxime Uranium adsorption

Adsorption of U(Ⅳ) onto amidoxime-functionalized Hydrothermal Carbon in the Presence of Ca-U(Ⅳ)-CO3 Complexes

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Research and Application of Materials Science 2019年第2期1卷 39-47页

作者： Yinghui XIE Zhimmin DONG Haoyan ZHANG Runze ZHOU Yunhai LIU Zhibin ZHANG State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchangJiangxiChina330013

The aim is collecting uranium from groundwater in which uranium mainly exists in negative species,the amidoxime-functionalized hydrothermal carbon(AO-HTC)was synthesized.From the results of N2 adsorption-desorption and SEM,AO-HTC is a small spherical surface;FT-IR and Elemental analysis showed that the amidoxime group was successfully grafted onto the surface of the material;Zeta-potential measurement showed that the amino nitrogen atom is protonated in the oxime group.The optimum pH value of AO-HTC for uranium adsorption is 6.0,and the adsorption equilibrium is reached within 80 min,which is in accordance with the pseudo-second order adsorption kinetic model.The adsorption of uranium by AO-HTC accords with the Langmuir isotherm adsorption model,and the single-layer saturated adsorption capacity is 254.13mg·g^-1.The thermodynamic parameters calculated by the adsorption isotherm indicate that AO-HTC adsorption of uranium is a spontaneous endothermic chemical process and Carbonate ion,calcium ion and humic acid concentration have great influence on uranium adsorption.The experiments results show that AO-HTC has the potential to elimination of U(Ⅳ)from groundwater.

关键词： uranium amidoxime hydrothermal carbon adsorption Ca-U(VI)-CO3 complexes

Preparation of amidoxime-based PE/PP fibers for extraction of uranium from aqueous solution

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Nuclear Science and Techniques 2019年第2期30卷 39-51页

作者： Xiao Xu Xiao-Jun Ding Jun-Xuan Ao Rong Li Zhe Xing Xi-Yan Liu Xiao-Jing Guo Guo-Zhong Wu Hong-Juan Ma Xiao-Yan Zhao School of Petrochemical Engineering Changzhou University Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

A novel amidoxime-based fibrous adsorbent,denoted as PE/PP-g-(PAAc-co-PAO), was prepared by preirradiation grafting of acrylic acid and acrylonitrile onto polyethylene-coated polypropylene skin-core(PE/PP)fibers using 60 Co γ-ray irradiation, followed by amidoximation. The original and modified PE/PP fibers were characterized by a series of characterization methods to demonstrate the attachment of amidoxime groups onto the PE/PP fibers. Breaking strength tests confirmed that the fibrous adsorbent could maintain good mechanical properties. The adsorption capacity of the PE/PP-g-(PAAc-coPAO) fibers was investigated in simulated seawater with an initial uranium concentration of 330 μg/L. The uranium adsorption capacity was 2.27 mg/g-adsorbent after 24 h in simulated seawater, and the equilibrium data were well described by the Freundlich isotherm model. The PE/PP-g-(PAAc-co-PAO) adsorbent exhibited good regeneration and recyclability during five adsorption-desorption cycles.The adsorption test was also performed in simulated radioactive effluents with uranium concentrations of 10 and100 μg/L. The effect of the pH value on the adsorption capacity was also studied. At a very low initial concentration 10 μg/L solution, the PE/PP-g-(PAAc-co-PAO)fiber could remove as much as 93.0% of the uranium, and up to 71.2% of the uranium in the simulated radioactive effluent. These results indicated that the PE/PP-g-(PAAcco-PAO) adsorbent could be used in radioactive effluents over a wide range of pH values. Therefore, the PE/PP-g-(PAAc-co-PAO) fibers, with their high uranium selectivity,good regeneration and recyclability,good mechanical properties, and low cost, are promising adsorbents for extracting uranium from aqueous solutions.

关键词： amidoxime groups Pre-irradiation PEcoated PP skin-core fiber Adsorption Uranium

Reduction of graphene oxide by amidoxime functionalized cellulose and its assembly

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Reduction of graphene oxide by amidoxime functionalized cell...