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| 双孔COF材料用于固相萃取水体中16种多环芳烃 |
| Heteropore covalent organic framework for solid phase extraction of 16 PAHs from water |
| 投稿时间：2021-01-12 |
| DOI：10.13254/j.jare.2021.0029 |
| 中文关键词: 多孔材料，共价有机骨架，固相萃取，多环芳烃，吸附，富集 |
| 英文关键词: porous material, heteropore covalent organic frameworks, solid-phase extraction, polycyclic aromatic hydrocarbons, adsorption, preconcerntration |
| 基金项目:创新项目基础研究（AEPI-004）；国家自然科学基金青年科学基金项目（32001784） |
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| 中文摘要: |
| 为了建立复杂样品中痕量多环芳烃准确的定量分析方法，采用溶剂热法制备了一种具有双孔径尺寸的共价有机骨架（异孔COFs），使用扫描电镜（SEM）、X射线衍射仪（XRD）、傅里叶变换红外光谱（FTIR）和孔隙率分析仪（BET）对材料的形貌和结构进行了表征。将所制备的异孔COFs材料作为固相萃取剂对水体样品中的16种多环芳烃进行吸附和富集，同时结合气相色谱-质谱联用法（GC-MS）对多环芳烃进行了定量分析。结果表明：异孔COFs不仅具有高的结晶度、优异的比表面积和高的孔隙率，且同时拥有两种尺寸（微孔和介孔）的孔径。此异孔COF材料可用于快速吸附环境水样中的16种多环芳烃，15 min内即可达到吸附平衡，富集倍数可达40倍。在0.25~50 μg·L-1浓度范围内与色谱峰面积具有良好的线性关系（R2>0.99），检出限为0.04~0.08 μg·L-1，加标回收率为82.3%~110.1%。此方法简单快速、成本低廉、检出限低、重复性好，适用于环境水样中痕量多环芳烃准确定量检测。 |
| 英文摘要: |
| To provide a simple and efficient method to adsorb trace polycyclic aromatic hydrocarbons(PAHs) from complex, real samples, heteropore covalent organic frameworks(HCOFs) crystalline porous material with two different kinds of pores was prepared through a solvothermal method. The HCOFs structure and morphologies were characterized by scanning electron microscopy, powder X-ray diffraction analysis, Fourier transform-infrared spectroscopy, and Brunauer-Emmett-Teller analysis. The ability of the HCOFs as a solid adsorbent for 16 PAHs from real water samples was investigated. Based on gas chromatography-mass spectrometry analysis, the contents of 16 PAHs were detected after treatment with HCOFs. The experimental results indicated that the prepared HCOFs displayed intriguing properties such as high crystallinity, large surface area, and high porosity, bearing both micro-pores(hexagonal) and mesopores(trigonal). This HCOFs can be used as an adsorbent for the rapid adsorption of 16 PAHs in environmental water samples. The absorption equilibrium was achieved after only 15 min oscillation, while that of the enrichment factor can be up to 40 times more. The method presented suitable linearity in the range of 0.25~50 μg·L-1 for the 16 PAHs with a satisfactory regression coefficient(R2>0.99). The detection limits for the method based on a signal-to-noise ratio of 3 were in the range of 0.04~0.08 μg·L-1. For the actual water samples, the recoveries of 16 PAHs ranged from 82.3% to 110.1%. These results demonstrated this method has advantages such as its simplicity, speed, cost-effectiveness, stability, and high sensitivity; moreover, this method is suitable for analyzing trace PAHs in water. |
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