Removal of cobalt from aqueous solution by magnetic multiwalled carbon nanotube/iron oxide composites
Removal of cobalt from aqueous solution by magnetic multiwalled carbon nanotube/iron oxide composites
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磁性多壁碳纳米管/氧化铁复合材料去除水溶液中的钴
DOI：
10.1016/j.cej.2011.08.059
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发表时间：
2011-10
影响因子：
15.1
通讯作者：
Wang, Xiangke
中科院分区：
文献类型：
--
作者：
Wang, Qi;Li, Jiaxing;Chen, Changlun;Ren, Xuemei;Hu, Jun;Wang, Xiangke
在室温条件下，考察了吸附时间、pH值、离子强度、外来离子、温度、腐殖物质（HSs）和Co（II）/HSs添加顺序对磁性多壁碳纳米管/氧化铁复合材料（MWCNT/IO复合材料）吸附Co（II）的影响.结果表明，Co（II）在磁性MWCNT/IO复合材料上的吸附量随pH值的增加而增加，吸附的离子强度和外来离子依赖性表明，在低pH值下，离子交换和外层表面络合是Co（II）的主要吸附机理，而离子强度和外来离子独立的钴（II）吸附在高pH值表明，内-球形表面络合是主要的吸附机理。Langmuir模型比Freundlich模型更好地拟合了Co（II）的吸附等温线。热力学数据计算的温度依赖的吸附等温线表明，钴（II）吸附在磁性MWCNT/IO复合材料是一个自发的吸热过程。磁性MWCNT/IO复合材料对Co（II）的去除受HS的存在和Co（II）/HS的添加顺序的影响明显。本研究突出了钴（II）和HS之间的相互作用，以确定在环境污染管理中的金属离子的去除无机和有机物质的相互影响。
The effects of contact time, pH, ionic strength, foreign ions, temperature, humic substances (HSs), and the addition sequences of Co(II)/HSs on Co(II) sorption on magnetic multiwalled carbon nanotube/iron oxide composites (magnetic MWCNT/IO composites) were investigated under ambient conditions. The results indicated that Co(II) sorption on the magnetic MWCNT/IO composites increased with increasing pH. The ionic strength and foreign ion dependent of Co(II) sorption suggested that ion exchange and outer-sphere surface complexation were the main sorption mechanism at low pH, whereas the ionic strength and foreign ion independent of Co(II) sorption at high pH values indicated that inner-sphere surface complexation was predominant sorption mechanism. The Langmuir model fitted Co(II) sorption isotherms better than the Freundlich model. The thermodynamic data calculated from the temperature dependent sorption isotherms suggested that Co(II) sorption on the magnetic MWCNT/IO composites was a spontaneous and endothermic process. The removal of Co(II) by the magnetic MWCNT/IO composites was affected evidently by the presence of HSs and by the addition sequences of Co(II)/HSs. This study highlights the interactions between Co(II) and HSs to determine the mutual effects of inorganic and organic matters on the removal of metal ions in environmental pollution management.
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DOI：
10.1016/j.jct.2005.11.010
发表时间：
2006-09
期刊：
The Journal of Chemical Thermodynamics
影响因子：
--
作者：
D. Mihoubi;A. Bellagi
通讯作者：
D. Mihoubi;A. Bellagi
影响因子：
11.4
作者：
R. M. Floroiu;A. Davis;A. Torrents
通讯作者：
R. M. Floroiu;A. Davis;A. Torrents
DOI：
10.1017/cbo9780511535598.013
发表时间：
2002-05
期刊：
--
影响因子：
--
作者：
E. Tipping
通讯作者：
E. Tipping
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影响因子：
3.4
作者：
Tan, Xiaoli;Chen, Changlun;Wang, Xiangke
通讯作者：
Wang, Xiangke
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影响因子：
13.6
作者：
Xu, Di;Tan, Xiaoli;Wang, Xiangke
通讯作者：
Wang, Xiangke