Immobilization of carboxyl-modified multiwalled carbon nanotubes in chitosan-based composite membranes for U(VI) sorption

Immobilization of carboxyl-modified multiwalled carbon nanotubes in chitosan-based composite membranes for U(VI) sorption
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羧基改性多壁碳纳米管在壳聚糖基复合膜中的固定化用于 U(VI) 吸附

DOI:
10.1007/s10967-018-5993-z
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发表时间:
2018-06
影响因子:
1.6
通讯作者:
Liu Zhirong
Liu Zhirong
中科院分区:
化学4区
文献类型:
--
作者:
Ouyang Jinbo;Wang Yun;Li Tianqi;Zhou Limin;Liu Zhirong

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将羧基修饰的多壁碳纳米管固定在壳聚糖基复合膜(CS-CNTs)上,作为U(VI)的高效吸附剂。在CS-CNTs膜中掺入CNTs提高了它们的机械强度以及U(VI)吸附性能。XPS分析表明,胺和羧基负责U(VI)的络合。吸附动力学符合准二级方程,而吸附等温线符合Langmuir模型(qm = 126.7 mg g−1,298 K)。此外,负载U(VI)的CS-CNT 8可以有效地由0.2 M酸化EDTA解吸和重复使用。
The carboxyl-modified multiwalled carbon nanotubes were immobilized in chitosan-based composite membranes (CS-CNTs) which were used as efficient sorbents for U(VI) sorption. The incorporation of CNTs in the CS-CNTs membranes improves their mechanical strength as well as U(VI) sorption performance. XPS analysis indicates that both amine and carboxyl groups are responsible for the complexation of U(VI). The sorption kinetics followed the pseudo-second order equation, whereas the sorption isotherms fitted well with Langmuir model (qm = 126.7 mg g−1 at 298 K). Moreover, the U(VI)-loaded CS-CNT8 can be effectively desorbed by 0.2 M acidified EDTA and reused.
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