Glycine derivative-functionalized metal-organic framework (MOF) materials for Co(II) removal from aqueous solution

Glycine derivative-functionalized metal-organic framework (MOF) materials for Co(II) removal from aqueous solution
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用于从水溶液中去除 Co(II) 的甘氨酸衍生物功能化金属有机骨架 (MOF) 材料

DOI:
10.1016/j.apsusc.2018.10.129
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发表时间:
2019-02
影响因子:
6.7
通讯作者:
Ning Liu
Ning Liu
中科院分区:
材料科学1区
文献类型:
--
作者:
Guoyuan Yuan;Hong Tu;Min Li;Jun Liu;Changsong Zhao;Jiali Liao;Yuanyou Yang;Jijun Yang;Ning Liu

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采用后合成法合成了一类新型的甘氨酸衍生物功能化金属有机骨架(MIL-101-glycine,MIL-101-diglycine,MIL-101-triglycine),并将其用于水溶液中钴离子的去除.结果表明,该吸附剂对Co(II)的吸附符合Langmuir吸附模型,对MIL-101-triglycine的最大饱和吸附容量为232.6 mg/g,是目前所获得的最高吸附容量的钴离子吸附剂。热力学和动力学参数表明,吸附过程是自发的和吸热的,并通过伪二级化学吸附进行,而吸附机理是由钴离子和吸附剂的配体之间的配位效应,如阐明的X射线光电子能谱(XPS)。特别地,评价了配体对复合材料对钴离子的吸附行为的影响,并且观察到吸附容量随着甘氨酸衍生物的配体链的长度而增加。本工作的所有结果表明,MIL-101是一个潜在的候选材料,用于分离钴离子,并应选择合适的长度的配体链的MOF修饰。
A new class of glycine derivative-functionalized metal-organic framework (MIL-101-glycine, MIL-101-diglycine, MIL-101-triglycine) was successfully prepared by a post-synthesis method and used to remove cobalt ions from an aqueous solution. The results indicated that the Co(II) adsorption was consistent with the Langmuir model, and the maximum saturation adsorption capacity reached 232.6 mg/g for MIL-101-triglycine, which is a higher value of cobalt ion adsorbent obtained to date. The thermodynamic and kinetic parameters showed that the adsorption process is spontaneous and endothermic and proceeds by pseudo-second-order chemisorption, while the adsorption mechanism is dominated by a coordination effect between the cobalt ions and the ligands of the adsorbent, as elucidated by X-ray photoelectron spectroscopy (XPS). In particular, the effect of the ligands on the adsorption behaviour of the composite materials for cobalt ions was evaluated, and it was observed that the adsorption capacity increased with the length of the ligand chain of the glycine derivatives. All findings of this work suggested that MIL-101 is a potential candidate material for the separation of cobalt ions and that an appropriate length of the ligand chain for MOF modification should be chosen.
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