| 磁性核壳CoFe2O4@SiO2@PIL-AO复合材料的制备及其吸附U (VI)性能研究 |
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| 引用本文： | 王芳,张辉,戴仲然,胡南,丁德馨,李广悦. 磁性核壳CoFe2O4@SiO2@PIL-AO复合材料的制备及其吸附U (VI)性能研究[J]. 环境科学学报, 2018, 38(9): 3605-3613 |
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| 作者姓名： | 王芳 张辉 戴仲然 胡南 丁德馨 李广悦 |
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| 作者单位： | 1. 南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001;2. 南华大学极贫铀资源绿色开发技术湖南省重点实验室, 衡阳 421001,1. 南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001;2. 南华大学极贫铀资源绿色开发技术湖南省重点实验室, 衡阳 421001,1. 南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001;2. 南华大学极贫铀资源绿色开发技术湖南省重点实验室, 衡阳 421001,1. 南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001;2. 南华大学极贫铀资源绿色开发技术湖南省重点实验室, 衡阳 421001,1. 南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001;2. 南华大学极贫铀资源绿色开发技术湖南省重点实验室, 衡阳 421001,1. 南华大学铀矿冶生物技术国防重点学科实验室, 衡阳 421001;2. 南华大学极贫铀资源绿色开发技术湖南省重点实验室, 衡阳 421001 |
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| 基金项目： | 国家自然科学基金重点项目（No.U1401231）；湖南省教育厅科学研究项目（No.16C1386）；南华大学研究生科研创新项目（No.2017XCX08） |
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| 摘 要： | 通过化学合成法制备了磁性核壳CoFe2O4@SiO2@PIL-AO复合材料，采用傅立叶变换红外光谱（FTIR）、扫描电镜（SEM）和X射线光电子能谱（XPS）对其进行了表征，研究了溶液pH、吸附时间、U （VI）初始浓度和温度等参数对U （VI）吸附性能的影响.实验结果表明：在c0=0.2 mg·L-1、pH=6.00±0.05、T=298.15 K、m=0.02 g和t=8 h的条件下，CoFe2O4@SiO2@PIL-AO对U （VI）的吸附作用最强，吸附率达到了97.54%；CoFe2O4@SiO2@PIL-AO吸附U （VI）是一个自发进行的吸热反应，U （VI）吸附动力学符合准二级动力学模型，吸附等温线符合Freundlich模型；CoFe2O4@SiO2@PIL-AO复合材料具有良好的可循环使用性，循环使用5次后它对U （VI）的吸附容量没有明显下降，可重复使用.
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| 关 键 词： | U (VI) 磁性核壳复合材料 CoFe2O4@SiO2@PIL-AO 吸附 |
| 收稿时间： | 2018-02-09 |
| 修稿时间： | 2018-02-25 |
Preparation of magnetic yolk/shell CoFe2O4@SiO2@PIL-AO composite material and its adsorption behavior for U(VI) |
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| WANG Fang,ZHANG Hui,DAI Zhongran,HU Nan,DING Dexin and LI Guangyue. Preparation of magnetic yolk/shell CoFe2O4@SiO2@PIL-AO composite material and its adsorption behavior for U(VI)[J]. Acta Scientiae Circumstantiae, 2018, 38(9): 3605-3613 |
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| Authors: | WANG Fang ZHANG Hui DAI Zhongran HU Nan DING Dexin LI Guangyue |
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| Affiliation: | 1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001;2. Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001,1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001;2. Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001,1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001;2. Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001,1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001;2. Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001,1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001;2. Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001 and 1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001;2. Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001 |
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| Abstract: | The magnetic yolk/shell CoFe2O4@SiO2@PIL-AO composite material was prepared by chemical synthesis and was characterized with FTIR, SEM and XPS. The adsorption of U(VI) on CoFe2O4@SiO2@PIL-AO as a function of solution pH, adsorption time, initial U(VI) concentration and temperature was investigated. The experimental results show that the CoFe2O4@SiO2@PIL-AO has strong adsorption capacity for U(VI), with the adsorption rate reaching the highest value of 97.54%, when c0=0.2 mg·L-1, pH=6.00±0.05, T=298.15 K, m=0.02 g and t=8 h. The adsorption process of U(VI) on CoFe2O4@SiO2@PIL-AO was spontaneous and endothermic. The adsorption kinetics follows the pseudo-second-order model, and the adsorption equilibrium data fitted the Freundlich model well. The prepared CoFe2O4@SiO2@PIL-AO has good recyclability and its adsorption capacity for U(VI) has no significant decrease after five cycles of adsorption and desorption. |
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| Keywords: | U (VI) magnetic yolk/shell composite materials CoFe2O4@SiO2@PIL-AO adsorption |
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