Moisture stable Ni-Zn MOF/g-C3N4 nanoflowers: A highly efficient adsorbent for solid-phase microextraction of PAHs
Moisture stable Ni-Zn MOF/g-C3N4 nanoflowers: A highly efficient adsorbent for solid-phase microextraction of PAHs
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水分稳定的 Ni-Zn MOF/g-C3N4 纳米花：一种用于固相微萃取 PAH 的高效吸附剂
DOI：
10.1016/j.chroma.2018.04.066
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发表时间：
2018
影响因子：
4.1
通讯作者：
Zhang Lan
中科院分区：
文献类型：
--
作者：
Zhang Ning;Huang Chuanhui;Tong Ping;Feng Zunmei;Wu Xiaoping;Zhang Lan
水和土壤中的挥发性多环芳烃(PAHs)与人体的状态有关。由于在直接浸泡固相微萃取中，涂层可能会受到大量水的侵蚀，因此开发简单、高效的检测方法具有挑战性。涂层的稳定性对分析结果至关重要。本文首次报道了一种具有空穴陷阱结构的稳定的Ni-Zn MOF/g-C_3N_4(MG_3N_4)纳米花作为固相微萃取(SPME)吸附剂对多环芳烃的吸附。通过在金属有机骨架(MOF)中掺杂疏水性的石墨化碳氮化物(g-C3N4)和金属离子，显着提高了MG-NFS微球的水稳定性和酸稳定性。Ni和g-C3N4的掺杂分别改变了MG-NFS微孔环境和周围环境。在双重保护下，MG-NFS的水稳定性和酸稳定性显著提高。与常用的商用涂料相比，MG-NFS膜具有较大的比表面积、独特的纳米花结构和大量的金属空位，对多环芳烃具有显著的萃取优势。多环芳烃的固相微萃取预富集与GC-MS联用，可用于多环芳烃的检测。方法检出限低(0.1~3.0 ng L−1)，线性范围宽(0.3~5000.0 ng L−1)，线性良好(r=0.9951)。一根光纤三次重复提取的日间和日间相对标准偏差(n = 3)分别为3.8%~9.1%和3.5%~9.2%。纤维间重复性(n = 3)为4.2~11.8%。该方法用于实际水样和土壤样品的分析，回收率分别为82.9-109.2%和84.2-106.4%，相对标准偏差分别为2.4-11.3%和3.6-10.8%。结果表明，NG-NFS涂层纤维在进一步的实际应用中是有效的。
Volatile polycyclic aromatic hydrocarbons (PAHs) in water and soil are associated with status in the human body. Development of simple, efficient detection method is challenging due to the coating could be attacked by the abundance of water in the direct-immersion solid-phase microextraction. The stability of coating is essential to the analysis results. In this paper, a stable Ni-Zn MOF/g-C3N4(MG NFs) nanoflowers with cavity traps structure was firstly reported and acted as solid-phase microextraction (SPME) adsorbent for PAHs. Markedly enhanced moisture and acid stability of the MG NFs was obtained through the doping the hydrophobic graphitic carbon nitride (g-C3N4) and metal ions into metal organic frameworks (MOFs). The aperture environment and ambient environment of MG NFs were changed by the doping of the Ni and the g-C3N4,respectively. The moisture and acid stability of MG NFs were prominently increased under the dual protection. Compared to commonly used commercial coatings, the MG NFs own large surface area, unique nanoflowers structure and numerous open metal sites on the nanosheets, which demonstrated significant extraction superiority for PAHs. The MG NFs coated fiber was used for the SPME preconcentration of PAHs and couped with GC–MS for detecting PAHs. It presented low detection limits (0.1–3.0 ng L−1), wide linearity (0.3–5000.0 ng L−1) and good linearity (the correlation coefficient >0.9951). The inter-day and intra-day relative standard deviation (RSD) (n = 3) for three replicate extractions using one fiber was 3.8%–9.1%, and 3.5%–9.2%, respectively. The fiber-to-fiber reproducibility (n = 3) was 4.2–11.8%. The coupling method was successfully applied in the analysis of real water and soil samples with satisfactory recoveries of 82.9–109.2%, 84.2–106.4%, and the corresponding RSDs were 2.4–11.3%, 3.6–10.8%, respectively. The results indicated the effectiveness of NG NFs coated fiber in further practical application.