期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 394, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122556
关键词
Ionic metal-organic frameworks (MOFs); Mixed-matrix membrane (MMM); Dispersion membrane extraction (DME); Phenoxy carboxylic acid (PCA) herbicides; Water sample
资金
- National Natural Science Foundation of China [21976099, 21876199]
- Natural Science Foundation of Shandong Province of China [ZR2019MB046]
- Chinese Academy of Sciences President's International Fellowship Initiative [2020PC0083]
- Taishan Scholar Project [ts20190962]
A novel kind of cationic metal-organic framework(MOF) based mixed-matrix membrane(MMM) namely cationic MOF-MMM was firstly designed and used for simultaneous dispersive membrane extraction(DME) of six phenoxy carboxylic acid(PCA) herbicides from water samples followed by determination using ultrahigh-performance liquid chromatography tandem mass spectrometry. The cationic MOF-MMM was synthesized by soaking the zirconium-based MOFs in a polyvinylidene fluoride(PVDF) solution and further functionalization with quaternary amine groups, viz., UiO-66-NMe3+ MMM. The well-prepared UiO-66-NMe3+ MMM was characterized by FT-IR, SEM, XRD, XPS, NMR and etc. Several main variables influencing the MMM based DME efficiency were investigated and optimized in detail, such as dosage ratio of MOF/PVDF, solution pH, extraction time, coexistent anions and ionic strength. Electrostatic interactions dominated adsorption mechanism between anionic PCAs and cationic UiO-66-NMe3+ MMM, along with pi-pi conjugation and cation-pi bonding, leading to better adsorption performance. Low limits of detection in the range of 0.03-0.59 ng/L and satisfactory recoveries within 80.06-117.40 % for all the PCAs are a reliable witness to demonstrate supreme sensitivity and the applicability of the developed method. By relying on the obtained results, the present work implied cationic MOF-MMM based DME can be a versatile and worthy utility for extraction of pollutants from different water samples with high throughput.
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