壳-核结构Fe_3O_4/MnO_2磁性吸附剂的制备、表征及铅吸附去除研究
Preparation and evaluation of shell-core structured Fe_3 O_4 /MnO_2 magnetic adsorbent for Pb(Ⅱ) removal from aqueous solutions
查看参考文献16篇
文摘
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采用共沉淀法制备了具有壳-核结构的磁性吸附剂Fe_3O_4/MnO_2,对其性质进行了系统表征,并对其铅吸附行为进行了初步研究.透射电镜(TEM)结果表明,Fe_3O_4/MnO_2为大小不规则的纳米级细小颗粒.X-射线衍射仪(XRD)表征结果表明,Fe_3O_4/MnO_2具有尖晶石的结构.振动样品磁强计(VSM)测得比饱和磁化强度为54.7 A·m~2·kg~(-1),吸附剂磁性较强,易于磁分离;BET比表面积为76.5 m~2·g~(-1).吸附试验结果表明,Fe_3O_4/MnO_2对铅具有良好的去除效果(特别是在低平衡浓度情况下),最大吸附量为142.0 mg·g~(-1)(pH=5.0);Langmuir等温线能更好地拟合Fe_3O_4/MnO_2对溶液中铅的吸附(R~2=0.852);吸附速率较快,在初始30 min内可达到平衡吸附量的80%,准二级动力学模型(R~2=0.959)能较好地描述吸附过程;溶液pH对Fe_3O_4/MnO_2吸附铅的影响较为明显,随pH升高,吸附量增大,但离子强度变化对吸附影响不大. |
其他语种文摘
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An adsorbent with Fe_3O_4 as magnetic core and MnO_2 as shell was prepared by co-precipitation process. The adsorbent was characterized using multiple techniques and its performance for Pb(II) removal from aqueous solution was investigated. The TEM image indicated that the shape of nanosized Fe_3O_4 /MnO_2 particles was irregular. X-ray powder diffraction (XRD) analysis showed that the magnetic phase in Fe_3 O_4 /MnO_2 was spinel magnetite. The adsorbent has a highly specific saturation magnetization of 54. 7 A·m~2·kg~(-1) and a specific surface area of 76. 5 m2·g~(- 1). The results of batch sorption experiments suggested that the Fe_3 O_4 /MnO_2 magnetic adsorbent was effective for Pb (II) removal from water,particularly at low equilibrium concentration. The isotherm data was well fitted by Langmuir model (R~2 = 0. 852) with a maximal Pb adsorption capacity of 142. 0 mg·g~(- 1) at pH 5. 0. The adsorption of Pb(II) was very fast and over 80% of the equilibrium sorption capacity was achieved within 30 min. The pseudo-second order model (R~2 = 0. 959) was more suitable to describe adsorption kinetic data. The Pb(II) adsorption increased with increasing values of solution pH and was not significantly affected by the change of ionic strength. |
来源
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环境科学学报
,2013,33(10):2730-2736 【核心库】
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关键词
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壳-核结构
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Fe_3O_4 /MnO_2
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磁性吸附剂
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铅
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吸附
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地址
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1.
烟台大学环境与材料工程学院, 烟台, 264003
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重点实验室;;山东省海岸带环境过程重点实验室, 烟台, 264003
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0253-2468 |
学科
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环境科学基础理论;行业污染、废物处理与综合利用 |
基金
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国家自然科学基金项目
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烟台市科技发展计划
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文献收藏号
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CSCD:4949200
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