| 铝代水铁矿协同吸附砷镉的机制 |
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| 引用本文： | 黄博,郭朝晖,肖细元,彭驰,朱惠文,史磊,阳安迪.铝代水铁矿协同吸附砷镉的机制[J].环境科学,2019,40(5):2287-2294. |
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| 作者姓名： | 黄博 郭朝晖 肖细元 彭驰 朱惠文 史磊 阳安迪 |
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| 作者单位： | 中南大学冶金与环境学院环境工程研究所,长沙410083;岳阳市环境监测中心,岳阳414000;中南大学冶金与环境学院环境工程研究所,长沙,410083 |
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| 基金项目： | 国家自然科学基金项目（21577176）；湖南省生态环境厅科研项目（201783045）；岳阳市科技局科研项目（2016321） |
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| 摘 要： | 通过室内试验,研究了铝代水铁矿对As(Ⅴ)和Cd(Ⅱ)的协同作用过程及机制.结果表明,溶液体系p H值和重金属加入顺序明显影响铝代水铁矿对砷和镉的协同吸附与共沉淀.在近中性砷镉共存体系下吸附72h(p H为6. 0～6. 5),含20%铝的铝代水铁矿(AF20)对砷和镉的吸附容量达到了60. 9 mg·g~(-1)和17. 1 mg·g~(-1),去除率分别为96. 0%和73. 0%,砷和镉协同吸附到AF20颗粒内部孔隙,AF20对砷和镉的协同吸附效应明显;在砷溶液中加入镉体系下吸附72 h(p H为6. 1～6. 5),AF20对砷和镉的吸附容量分别为58. 1 mg·g~(-1)和12. 4 mg·g~(-1),去除率分别为96. 0%和48. 3%,砷的吸附限制了镉的固定;在镉溶液中加入砷体系下吸附72 h(p H为9. 5～9. 8),AF20对砷和镉固定量分别为20. 9 mg·g~(-1)和24. 4 mg·g~(-1),去除率分别为38. 8%和98. 9%,AF20对砷和镉的共沉淀效应明显,生成的砷镉难溶物通过堵塞孔道使镉呈稀疏条带状分布,同时阻碍砷的进一步吸附.上述结果表明,铝代水铁矿可协同吸附、共沉淀污染环境介质中的砷和镉.
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| 关 键 词： | 铝代水铁矿 砷 镉 协同吸附 共沉淀 |
| 收稿时间： | 2018/12/30 0:00:00 |
| 修稿时间： | 2019/1/7 0:00:00 |
Mechanism of Synergistic Adsorption of Arsenic and Cadmium by Aluminium-substituted Ferrihydrites |
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| HUANG Bo,GUO Zhao-hui,XIAO Xi-yuan,PENG Chi,ZHU Hui-wen,SHI Lei and YANG An-di.Mechanism of Synergistic Adsorption of Arsenic and Cadmium by Aluminium-substituted Ferrihydrites[J].Chinese Journal of Environmental Science,2019,40(5):2287-2294. |
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| Authors: | HUANG Bo GUO Zhao-hui XIAO Xi-yuan PENG Chi ZHU Hui-wen SHI Lei and YANG An-di |
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| Institution: | Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China;Yueyang Environmental Monitoring Centre, Yueyang 414000, China,Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China,Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China,Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China,Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China,Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China and Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha 410083, China |
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| Abstract: | |
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| Keywords: | aluminium-substituted ferrihydrites arsenic cadmium synergistic adsorption coprecipitation |
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