其他题名Adsorption of As (V) on Ce-Mn binary oxide: Behavior and mechanism
张传巧1; 陈静2; 吴秋月3; 张高生4
; 吴鹍1发表期刊环境化学
ISSN0254-6108
2020
卷号39期号:12页码:3542-3551
关键词Ce-Mn复合金属氧化物吸附机制
研究领域Environmental Sciences & Ecology
英文摘要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 CeO_2 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 CeO_2 and MnO_2,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 PO_4~(3-) and SiO_2-3 inhibited As(V) adsorption,whereas the cations Ca~(2+) and Mg~(2+) 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.
中文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CeO_2与MnO_2,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PO_4~(3-)与SiO_2-3对As(V)吸附存在竞争作用,Ca~(2+)与Mg~(2+)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.
文章类型Article
资助机构国家自然科学基金
收录类别CSCD
语种中文
CSCD记录号CSCD:6895324
引用统计
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/30312
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
作者单位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
推荐引用方式
GB/T 7714张传巧,陈静,吴秋月,等. Ce-Mn复合氧化物对As(V)的吸附行为与机制[J]. 环境化学,2020,39(12):3542-3551.
APA张传巧,陈静,吴秋月,张高生,&吴鹍.(2020).Ce-Mn复合氧化物对As(V)的吸附行为与机制.环境化学,39(12),3542-3551.
MLA张传巧,et al."Ce-Mn复合氧化物对As(V)的吸附行为与机制".环境化学 39.12(2020):3542-3551.
PDF全文下载地址:
点我下载PDF
