季铵功能化的金属有机骨架对水中双氯芬酸钠的高效吸附与去除

doi:10.3724/SP.J.1123.2017.11038

色谱 ›› 2018, Vol. 36 ›› Issue (3): 222-229.DOI: 10.3724/SP.J.1123.2017.11038

季铵功能化的金属有机骨架对水中双氯芬酸钠的高效吸附与去除

隗玉¹, 隗翠香¹, 夏炎^1,2

1. 南开大学化学学院, 天津 300071;
2. 天津市生物传感与分子识别重点实验室, 天津 300071

收稿日期:2017-11-22 出版日期:2018-03-08 发布日期:2018-04-04
通讯作者: 夏炎,Tel:(022)23508794,E-mail:nkxiayan@nankai.edu.cn
基金资助:
天津市应用基础与前沿技术研究计划（15JCYBJC23800）.

Efficient adsorption and removal of diclofenac sodium from water with quaternary ammonium functionalized metal-organic frameworks

WEI Yu¹, WEI Cuixiang¹, XIA Yan^1,2

1. College of Chemistry, Nankai University, Tianjin 300071, China;
2. Key Laboratory of Biosensing and Molecular Recognition, Tianjin 300071, China

Received:2017-11-22 Online:2018-03-08 Published:2018-04-04
Supported by:
Tianjin Research Program of Application Foundation and Advanced Technology (No. 15JCYBJC23800).

摘要/Abstract

摘要：

通过两步合成法制备了季铵功能化的金属有机骨架MIL-101（Cr）即MIL-101（Cr）-NMe₃，并考察了该材料对双氯芬酸钠（DCF）的吸附行为。通过不同浓度的DCF在MIL-101（Cr）-NMe₃吸附剂上的动力学数据，以及在不同温度下的吸附平衡等温线和MIL-101（Cr）-NMe₃吸附剂的重复使用性能考察，发现该材料对DCF的吸附过程符合准二级动力学方程，吸附平衡等温线符合Langmuir等温吸附模型，在20℃下的最大吸附量为310.6 mg/g，5次循环使用后吸附量未明显减少。MIL-101（Cr）-NMe₃对DCF的吸附作用机理可归结为静电相互作用和π-π相互作用，吸附效果远大于未修饰氨基的MIL-101（Cr）。可以预见该材料对水中DCF的去除具有良好的应用前景。

关键词: 金属有机骨架, 去除, 双氯芬酸钠, 吸附

Abstract:

A quaternary ammonium functionalized MIL-101(Cr) named MIL-101(Cr)-NMe₃ was synthesized and explored as a novel adsorbent for the fast removal of diclofenac sodium (DCF) in water. The adsorption process of kinetics, adsorption isotherms, thermodynamics, and adsorbent regeneration were investigated. And the effects of key parameters such as pH value and ionic strength on the adsorption of DCF were also studied. The results showed that the adsorption of DCF on MIL-101(Cr)-NMe₃ was very fast. Most of DCF were adsorbed in the first 30 min. The adsorption kinetics of DCF on MIL-101(Cr)-NMe₃ obeyed pseudo-second-order kinetics. The adsorption isotherms of DCF on MIL-101(Cr)-NMe₃ fitted well to the Langmuir adsorption model. And the maximum adsorption capacity was 310.6 mg/g at 20℃. The analysis of the adsorption mechanism showed that the electrostatic interaction and π-π stacking interaction between DCF and MIL-101(Cr)-NMe₃ were responsible for the efficient adsorption. Regeneration experiments indicated that the used MIL-101(Cr)-NMe₃ was recycled at least five times without significant loss of adsorption capacity. The fast adsorption kinetics, high adsorption capacity, and excellent reusability made MIL-101(Cr)-NMe₃ attractive for removal DCF from aqueous solution.

Key words: adsorption, diclofenac sodium, metal-organic frameworks (MOFs), removal

中图分类号:

O658

隗玉, 隗翠香, 夏炎. 季铵功能化的金属有机骨架对水中双氯芬酸钠的高效吸附与去除[J]. 色谱, 2018, 36(3): 222-229.

WEI Yu, WEI Cuixiang, XIA Yan. Efficient adsorption and removal of diclofenac sodium from water with quaternary ammonium functionalized metal-organic frameworks[J]. Chinese Journal of Chromatography, 2018, 36(3): 222-229.

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季铵功能化的金属有机骨架对水中双氯芬酸钠的高效吸附与去除

Efficient adsorption and removal of diclofenac sodium from water with quaternary ammonium functionalized metal-organic frameworks

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