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Cationic metal-organic framework based mixed-matrix membrane for extraction of phenoxy carboxylic acid (PCA) herbicides from water samples followed by UHPLC-MS/MS determination.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-03-19 , DOI: 10.1016/j.jhazmat.2020.122556
Gege Wu 1 , Jiping Ma 1 , Shasha Wang 1 , Huining Chai 1 , Liang Guo 2 , Jinhua Li 3 , Abbas Ostovan 3 , Yafeng Guan 4 , Lingxin Chen 5
Affiliation  

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 ππ conjugation and cation-π 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.

中文翻译:

基于阳离子金属-有机骨架的混合基质膜,用于从水样品中提取苯氧基羧酸(PCA)除草剂,然后进行UHPLC-MS / MS测定。

首先设计了一种新型的基于阳离子金属有机骨架的混合基质膜,即阳离子MOF-MMM,并将其用于从水样中同时分散膜萃取(DME)六种苯氧基羧酸(PCA)除草剂。然后使用超高效液相色谱串联质谱法进行测定。通过将锆基MOF浸泡在聚偏二氟乙烯(PVDF)溶液中并用季胺基团(UiO-66-NMe3 + MMM)进一步官能化来合成阳离子MOF-MMM。通过FT-IR,SEM,XRD,XPS,NMR等手段对制备良好的UiO-66-NMe3 + MMM进行了表征。详细研究了影响基于MMM的DME效率的几个主要变量,例如MOF /的配比PVDF,溶液pH值,萃取时间,阴离子和离子强度并存。静电相互作用决定了阴离子PCA与阳离子UiO-66-NMe3 + MMM之间的吸附机理,以及ππ共轭和阳离子-π键的结合,从而导致了更好的吸附性能。所有PCA的低检测限在0.03-0.59 ng / L范围内,回收率在80.06-117.40%之间,是可靠的证据,证明了所开发方法的最高灵敏度和适用性。依靠获得的结果,本工作隐含基于阳离子MOF-MMM的DME可以成为一种通用且有价值的工具,可以高通量从不同的水样中提取污染物。导致更好的吸附性能。所有PCA的低检测限在0.03-0.59 ng / L范围内,回收率在80.06-117.40%之间,是可靠的证据,证明了所开发方法的最高灵敏度和适用性。依靠获得的结果,本工作隐含基于阳离子MOF-MMM的DME可以成为一种通用且有价值的工具,可以高通量从不同的水样中提取污染物。导致更好的吸附性能。所有PCA的低检测限在0.03-0.59 ng / L范围内,回收率在80.06-117.40%之间,是可靠的证据,证明了所开发方法的最高灵敏度和适用性。依靠所获得的结果,本工作隐含基于阳离子MOF-MMM的DME可以成为一种通用且有价值的工具,可以高通量从不同的水样中提取污染物。
更新日期:2020-03-20
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