首页|Efficient adsorption of europium (Ⅲ) and uranium (Ⅵ) by titanate nanorings: Insights into radioactive metal species

Efficient adsorption of europium (Ⅲ) and uranium (Ⅵ) by titanate nanorings: Insights into radioactive metal species

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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.

Titanate nanoringsIon exchangeRadionuclidesSpeciesAdsorption

Maosheng Zheng、Haodong Ji、Jun Duan、Chenyuan Dang、Xingmin Chen、Wen Liu

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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, 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 Engineering, Peking University, Beijing, 100871,China

College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China

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Support from the National Natural Science Foundation of ChinaSupport from the National Natural Science Foundation of ChinaChina Postdoctoral Science FoundationThis work was also supported by the Beijing Nova Program

grants no 21906001no 51721006grant no 2019M650007 is acknowledgedZ19111000110000

2020

环境科学与技术
湖北省环境科学研究院

环境科学与技术

CSTPCDCSCD北大核心
影响因子：0.943
ISSN：1003-6504
年,卷(期)：2020.2(4)
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