Sorption kinetics, thermodynamics and competition of Ni2+ from aqueous solutions onto surface oxidized carbon nanotubes.
Sorption kinetics, thermodynamics and competition of Ni2+ from aqueous solutions onto surface oxidized carbon nanotubes.
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DOI：
10.1016/j.desal.2009.06.009
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发表时间：
2009-11
期刊：
影响因子：
9.9
通讯作者：
Chungsying Lu;Chunti Liu;Fengsheng Su
中科院分区：
文献类型：
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作者：
Chungsying Lu;Chunti Liu;Fengsheng Su
以NaClO溶液氧化单壁碳纳米管（SWCNTs）和多壁碳纳米管（MWCNTs）为吸附剂，研究了它们对水溶液中Ni 2+的吸附动力学和热力学.随着温度的升高，Ni 2+在单壁碳纳米管和多壁碳纳米管上的吸附量增加。吸附动力学遵循准二级速率定律，吸附热力学表现为吸热和自发性质。在相同条件下，单壁碳纳米管和多壁碳纳米管对Ni 2+的吸附性能均优于市售颗粒活性炭，表明两种碳纳米管都是水和废水处理中的高效Ni 2+吸附剂。对Ni 2+和Zn 2+在单壁碳纳米管和多壁碳纳米管上的竞争吸附进行了研究，结果表明，单壁碳纳米管和多壁碳纳米管对Ni 2+和Zn 2+的竞争吸附量远大于无竞争吸附量。Zn ~（2+）对Ni ~（2+）吸附的竞争作用强于Ni ~（2+）对Zn ~（2+）吸附的竞争作用。
Singlewalled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs) were oxidized by NaClO solutions and were employed as sorbents to study their sorption kinetics and thermodynamics of Ni2+from aqueous solutions. The amount of Ni2+sorbed onto SWCNTs and MWCNTs increased with a rise in temperature. The sorption kinetics follows the pseudo-second-order rate law while the sorption thermodynamics indicates the endothermic and spontaneous nature. Under the same conditions, the SWCNTs and MWCNTs possess better performance of Ni2+sorption than the commercially available granular activated carbon, reflecting that both CNTs are efficient Ni2+sorbents in water and wastewater treatment. The competitive sorption of Ni2+and Zn2+onto SWCNTs and MWCNTs was also conducted and revealed that the sorption capacities of Ni2+and Zn2+without competition are much greater than those with competition. The competition which Zn2+exerts on the sorption of Ni2+is stronger than the competition exerted by Ni2+on the sorption of Zn2+.