Radionuclides with long half-life are toxic,and thereby result in serious threat to human beings and ecological balance.Herein,a simple two-step synthesis method was used to prepare manganese dioxide@polypyrrole（Mn O...Radionuclides with long half-life are toxic,and thereby result in serious threat to human beings and ecological balance.Herein,a simple two-step synthesis method was used to prepare manganese dioxide@polypyrrole（Mn O2@PPy）core/shell structures for efficient removal of U（Ⅵ）and Eu（Ⅲ）from aqueous solutions.The adsorption of U（Ⅵ）and Eu（Ⅲ）were investigated under different kinds of experimental conditions.The experimental results suggested that the adsorption of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy were greatly affected by p H.U（Ⅵ）adsorption on Mn O2@PPy was independent of ionic strength at p H6.0.However,Eu（Ⅲ）adsorption on Mn O2@PPy was independent of ionic strength at the whole p H range of experimental conditions.The maximum adsorption capacities（q（max））of U（Ⅵ）and Eu（Ⅲ）were 63.04 and54.74 mg g（-1）at T=298 K,respectively.The BET,XRD,FTIR and XPS analysis evidenced that high adsorption capacities of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy were mainly due to high surface area and rich metal oxygen-containing group（i.e.,Mn–OH and Mn–O）,and the interaction was mainly attributed to strong surface complexation and electrostatic interaction.This study highlighted the excellent adsorption performance of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy and could provide the reference for the elimination of radionuclides in real wastewater management.展开更多
The α-preformation probability is directly deduced from experimental α decay energies and half-lives in an analytical way without any modified parameters. Several other model-deduced results, are used to compare wit...The α-preformation probability is directly deduced from experimental α decay energies and half-lives in an analytical way without any modified parameters. Several other model-deduced results, are used to compare with that of the present study. The key role played by the shell effects in the v-preformation process is indicated in all these cases. In detail, the α-preformation factors of different theoretical extractions are found to have similar behavior for one given isotopic chain, implying the model-independent varying trend of the preformation probability of α particle. In addition, the formation probability of heavier particle in cluster radioactivity is also obtained, and this confirms the relationship between the cluster preformation factor and the product of the cluster and daughter proton numbers.展开更多
基金supported by the National Key Research and Development Program of China (2017YFA0207002)the National Natural Science Foundation of China (21577032)+1 种基金the Fundamental Research Funds for the Central Universities (2018ZD11, 2018MS114)the Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection and the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Radionuclides with long half-life are toxic,and thereby result in serious threat to human beings and ecological balance.Herein,a simple two-step synthesis method was used to prepare manganese dioxide@polypyrrole（Mn O2@PPy）core/shell structures for efficient removal of U（Ⅵ）and Eu（Ⅲ）from aqueous solutions.The adsorption of U（Ⅵ）and Eu（Ⅲ）were investigated under different kinds of experimental conditions.The experimental results suggested that the adsorption of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy were greatly affected by p H.U（Ⅵ）adsorption on Mn O2@PPy was independent of ionic strength at p H6.0.However,Eu（Ⅲ）adsorption on Mn O2@PPy was independent of ionic strength at the whole p H range of experimental conditions.The maximum adsorption capacities（q（max））of U（Ⅵ）and Eu（Ⅲ）were 63.04 and54.74 mg g（-1）at T=298 K,respectively.The BET,XRD,FTIR and XPS analysis evidenced that high adsorption capacities of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy were mainly due to high surface area and rich metal oxygen-containing group（i.e.,Mn–OH and Mn–O）,and the interaction was mainly attributed to strong surface complexation and electrostatic interaction.This study highlighted the excellent adsorption performance of U（Ⅵ）and Eu（Ⅲ）on Mn O2@PPy and could provide the reference for the elimination of radionuclides in real wastewater management.
基金the National Natural Science Foundation of China (Grant Nos. 11035001, 10975072, 10735010 and 11120101005)the National Major State Basic Research and Development of China (Grant Nos. 2010CB327803 and 2013CB834400)+4 种基金the Knowledge Innovative Program of the Chinese Academy of Sciences (Grant No. KJCX2-SW-N02)the Research Fund of Doctoral Point (RFDP) (Grant No. 20100091110028)the Project Funded by the Priority Academic Programme Development of Jiangsu Higher Education Institutions (PAPD)the Research and Innovation for College Postgraduate of JiangSu Province (Grant No. CXZZ12 0031)the Science and Technology Development Fund of Macao (Grant No.068/2011/A)
文摘The α-preformation probability is directly deduced from experimental α decay energies and half-lives in an analytical way without any modified parameters. Several other model-deduced results, are used to compare with that of the present study. The key role played by the shell effects in the v-preformation process is indicated in all these cases. In detail, the α-preformation factors of different theoretical extractions are found to have similar behavior for one given isotopic chain, implying the model-independent varying trend of the preformation probability of α particle. In addition, the formation probability of heavier particle in cluster radioactivity is also obtained, and this confirms the relationship between the cluster preformation factor and the product of the cluster and daughter proton numbers.
