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Ce-Mn复合氧化物对As(V)的吸附行为与机制

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张传巧, 陈静, 吴秋月, 张高生, 吴鹍. Ce-Mn复合氧化物对As(V)的吸附行为与机制[J]. 环境化学, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
引用本文: 张传巧, 陈静, 吴秋月, 张高生, 吴鹍. Ce-Mn复合氧化物对As(V)的吸附行为与机制[J]. 环境化学, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
shu
ZHANG Chuanqiao, CHEN Jing, WU Qiuyue, ZHANG Gaosheng, WU Kun. Adsorption of As (V) on Ce-Mn binary oxide:Behavior and mechanism[J]. Environmental Chemistry, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
Citation: ZHANG Chuanqiao, CHEN Jing, WU Qiuyue, ZHANG Gaosheng, WU Kun. Adsorption of As (V) on Ce-Mn binary oxide:Behavior and mechanism[J]. Environmental Chemistry, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
shu

Ce-Mn复合氧化物对As(V)的吸附行为与机制

  • 1. 西安建筑科技大学环境与市政工程学院, 西安, 710055;

  • 2. 中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 烟台, 264003;

  • 3. 苏州科技学院环境科学与工程学院, 江苏省环境功能材料重点实验室, 苏州, 215009;

  • 4. 广州大学, 珠江三角洲水质安全与保护教育部重点实验室, 广州, 510006

    • 通讯作者: 陈静, E-mail: jchen@yic.ac.cn ;  吴鹍, E-mail: wukun2012@xauat.edu.cn
  • 基金项目:

    国家自然科学基金（51478457）资助.

Adsorption of As (V) on Ce-Mn binary oxide:Behavior and mechanism

  • 1. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China;

  • 2. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China;

  • 3. Jiangsu Key Laboratory for Environment Functional Materials, Environment Science and Engineering College, Suzhou University of Science and Technology, Suzhou, 215009, China;

  • 4. Key Laboratory of Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, 510006, China

    • Corresponding authors: CHEN Jing, jchen@yic.ac.cn ;  WU Kun, wukun2012@xauat.edu.cn
  • Fund Project: Supported by the National Natural Science Foundation of China (51478457).

  • 摘要: 采用氧化共沉淀法制备了新型Ce-Mn复合氧化物吸附剂，通过批式实验，系统地研究了其对As（V）的吸附行为，并采用FTIR、XPS等表征技术研究了其对As（V）的吸附机制.研究结果表明，随着Mn的引入，铈锰复合氧化物对As（V）的吸附产生了协同效应，对As（V）的吸附容量显著高于单一组分的CeO2与MnO2，尤其当Ce/Mn摩尔比为3：1时；As（V）吸附速率较快，4 h吸附量达平衡吸附量的90.8%；吸附剂对As（V）具有较高的吸附容量，且酸性条件有利于As（V）的吸附，在pH 5.0、7.0、9.0时最大吸附容量分别为77.8、63.5、39.0 mg·g-1；Freundlich模型能较好地拟合其对As（V）的吸附过程，离子强度对As（V）的吸附影响不大，溶液中PO43-与SiO32-对As（V）吸附存在竞争作用，Ca2+与Mg2+则有助于促进As（V）吸附.机制研究结果表明，As（V）主要通过在Ce-Mn复合金属氧化物表面形成单齿单核和双齿双核的内层配合物而从溶液去除.
    Abstract: A novel Ce-Mn binary oxide adsorbent was synthesized via oxidation and co-precipitation method. As(V) adsorption behavior on Ce-Mn bimetal oxide was systematically investigated by batch experiments. As(V) adsorption mechanism was studied using FTIR and XPS techniques. The results indicated that the introduction of manganese oxides into CeO2 emerged a synergistic effect on As(V) adsorption, which was evidently proved by the much higher adsorption capacity of Ce-Mn bimetal oxide than that of the pure CeO2 and MnO2, especially at the Ce/Mn molar ratio of 3:1. The adsorption of As(V) was relatively fast and over 90.8% of the equilibrium adsorption capacity was obtained within 4 h. Ce-Mn bimetal oxide had good performance for As(V) adsorption, especially under acidic conditions. The maximum adsorption capacity was 77.8, 63.5 and 39.0 mg·g-1 at pH 5.0, 7.0 and 9.0, respectively. Freundlich model was more suitable to describe the adsorption isotherm data. The ionic strength had little influence on the adsorption. The coexisting anions PO43- and SiO32- inhibited As(V) adsorption, whereas the cations Ca2+ and Mg2+ slightly enhanced As(V) adsorption. Mechanism investigations suggested that As(V) was probably removed from the solution by forming monodentate mononuclear and didentate dinuclear complexes on the surface of Ce-Mn bimetal oxide.
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  • 收稿日期:  2019-09-06
张传巧, 陈静, 吴秋月, 张高生, 吴鹍. Ce-Mn复合氧化物对As(V)的吸附行为与机制[J]. 环境化学, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
引用本文: 张传巧, 陈静, 吴秋月, 张高生, 吴鹍. Ce-Mn复合氧化物对As(V)的吸附行为与机制[J]. 环境化学, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
shu
ZHANG Chuanqiao, CHEN Jing, WU Qiuyue, ZHANG Gaosheng, WU Kun. Adsorption of As (V) on Ce-Mn binary oxide:Behavior and mechanism[J]. Environmental Chemistry, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
Citation: ZHANG Chuanqiao, CHEN Jing, WU Qiuyue, ZHANG Gaosheng, WU Kun. Adsorption of As (V) on Ce-Mn binary oxide:Behavior and mechanism[J]. Environmental Chemistry, 2020, (12): 3542-3551. doi: 10.7524/j.issn.0254-6108.2019090605
shu

Ce-Mn复合氧化物对As(V)的吸附行为与机制

    通讯作者: 陈静, E-mail: jchen@yic.ac.cn ;  吴鹍, E-mail: wukun2012@xauat.edu.cn
  • 1. 西安建筑科技大学环境与市政工程学院, 西安, 710055;
  • 2. 中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 烟台, 264003;
  • 3. 苏州科技学院环境科学与工程学院, 江苏省环境功能材料重点实验室, 苏州, 215009;
  • 4. 广州大学, 珠江三角洲水质安全与保护教育部重点实验室, 广州, 510006
  • 收稿日期:  2019-09-06
基金项目:

国家自然科学基金（51478457）资助.

摘要: 采用氧化共沉淀法制备了新型Ce-Mn复合氧化物吸附剂，通过批式实验，系统地研究了其对As（V）的吸附行为，并采用FTIR、XPS等表征技术研究了其对As（V）的吸附机制.研究结果表明，随着Mn的引入，铈锰复合氧化物对As（V）的吸附产生了协同效应，对As（V）的吸附容量显著高于单一组分的CeO2与MnO2，尤其当Ce/Mn摩尔比为3：1时；As（V）吸附速率较快，4 h吸附量达平衡吸附量的90.8%；吸附剂对As（V）具有较高的吸附容量，且酸性条件有利于As（V）的吸附，在pH 5.0、7.0、9.0时最大吸附容量分别为77.8、63.5、39.0 mg·g-1；Freundlich模型能较好地拟合其对As（V）的吸附过程，离子强度对As（V）的吸附影响不大，溶液中PO43-与SiO32-对As（V）吸附存在竞争作用，Ca2+与Mg2+则有助于促进As（V）吸附.机制研究结果表明，As（V）主要通过在Ce-Mn复合金属氧化物表面形成单齿单核和双齿双核的内层配合物而从溶液去除.

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