Efficient adsorption of europium (Ⅲ) and uranium (Ⅵ) by titanate nanorings: Insights into radioactive metal species
Maosheng Zheng1
Haodong Ji2
Jun Duan3
Chenyuan Dang3
Xingmin Chen4
Wen Liu2
1.The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing,100871, China;The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Engineering,North China Electric Power University, Beijing, 102206, China2.The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing,100871, China;The Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), Peking University, Beijing, 100871, China;Beijing Engineering Research Center for Advanced Wastewater Treatment, Department of Environmental Eng3.The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, Beijing,100871, China4.College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China
摘要：Radioactive wastewater containing high concentration of radionuclides poses severe threats to ecosystem and human health,so efficient removal of these toxic heavy metals is urgently needed.Titanate nanomaterials have been demonstrated good adsorbents for heavy metals due to ion exchange property.In this study,titanate nanorings (TNRs) were synthesized using the facile hydrothermal-cooling method.The TNRs were composed of sodium trititanate,with a chemical formula of Na0.66H1.34-Ti3O7·0.27H2O and a Na content of 2.38 mmol/g.The TNRs demonstrated sufficient adsorption performance to radionuclides europium (Eu) and uranium (U) ions.Specifically,even at a high initial concentration of 50 mg/L,86.5％ and 92.6％ of the two metal ions can be rapidly adsorbed by the TNRs within 5 min,and equilibrium was reached within 60 min at pH 5.The maximum adsorption capacity (Qmax) obtained by the Langmuir isotherm model was 115.3 mg/g for Eu(Ⅲ) and 282.5 mg/g for uranium U(Ⅵ) at pH 5,respectively.The adsorption capacities of the two metals under various water chemical conditions were highly related to their species.Ion exchange between metal cations and Na+ in the TNR interlayers was the dominant adsorption mechanism,and adsorption of U(Ⅵ) was more complicated because of the co-existence of various uranyl (UO22+) and uranyl-hydroxyl species.The spent TNRs were effectively regenerated through an acid-base or ethylenediamine tetraacetic acid (EDTA) treatment and reused.Considering the large adsorption capacity and quick kinetic,TNRs are promising materials to remove radionuclides in environmental purification applications,especially emergent treatment of leaked radionuclides.
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论文发表日期：2020-04-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：10( 78-87 )
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